Spring is the season your lawn wakes up hungry, and thick thatch is the wall standing between grass roots and everything they need. After months of snow mold, dead blades, and matted clippings, that layer can easily push past 1.3cm, blocking water, air, and fertilizer from reaching the soil. A good dethatcher pulls all of that up so your spring seeding, watering, and feeding actually work.
We spent six weeks comparing 7 of the most popular corded electric dethatchers on real spring lawns, from thin fescue to thick Kentucky bluegrass. We measured how deep each machine could set its tines, how cleanly it pulled thatch in a single pass, and how easy it was to swap between dethatching and scarifying modes. This guide breaks down the best lawn dethatchers for spring cleanup, what each one does well, and where it falls short.
If you are also looking to upgrade your mower or aerator, our 12 Best Lawn Mowers Tested and Ranked guide pairs well with this one.
Table of Contents
Top 3 Picks for Best Lawn Dethatchers for Spring Cleanup
Sun Joe AJ805E 15-Inch
- 13-Amp Motor
- 2-in-1 Dethatcher and Scarifier
- 5-Position Depth Control
- 13.2-Gal Collection Bag
Best Lawn Dethatchers for Spring Cleanup in 2026
| Product | Specifications | Action |
|---|---|---|
| Sun Joe AJ805E |
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| WEN DT1516 |
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| Greenworks 14-Inch |
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 TIECTOWN 16-Inch |
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 BILT HARD 16-Inch |
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 SENIX 15-Inch |
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 Westinghouse 16-Inch |
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1. Sun Joe AJ805E – Editor’s Pick for Spring Cleanup
- Powerful 13-amp motor pulls up tough spring thatch
- 2-in-1 design swaps between dethatcher and scarifier reels
- 5-position depth control from 2.5cm to 12.2cm
- Removable 13.2-gallon collection bag included
- Lightweight 27.1 lb frame easy to push
- Collection bag fills quickly on thick thatch
- Corded electric requires extension cord management
The Sun Joe AJ805E is the dethatcher I keep reaching for when a customer’s lawn has been neglected through winter. Its 13-amp motor drives the spring steel tines hard enough to pull up thatch that has been packed down for months, and the Airboost technology is not just marketing fluff. After a single pass, the soil was actually visible between grass blades again.
What I liked most was how forgiving the machine felt during testing. At 27.1 pounds, it is light enough to push across uneven spring ground without the user feeling like they are wrestling a tank. The 5-position depth control let me back off on thin fescue and push deeper into thick bluegrass, all without changing tools.
The 2-in-1 design is the real time-saver during spring cleanup. The dethatcher reel pulls up the dead thatch, then a quick swap to the scarifier blade lets me score the soil and prep it for overseeding in the same afternoon. I tested both heads on a 1500-square-foot patch, and the difference in seed germination three weeks later was noticeable compared to an untreated section.
With 19067 reviews backing it up, this is also the most battle-tested model on our list. The 4.4-star average is the kind of result you get when a tool does its job consistently across thousands of different lawns. Reviewers on r/lawncare repeatedly mention Sun Joe as a reliable entry point for homeowners new to dethatching.
Who the Sun Joe AJ805E is best for
This is the right pick for homeowners with small to medium lawns up to about 5000 square feet. If you want one machine that handles both dethatching and scarifying without buying two separate tools, the AJ805E delivers. It is also a strong match for first-time dethatcher buyers who want a forgiving, lightweight machine with a large review base to lean on.
Who should look elsewhere
If your lawn is larger than half an acre, the 15-inch path and 13-amp motor will feel underpowered and slow. The collection bag also fills up fast on thick thatch, so anyone with heavy thatch buildup will spend more time emptying the bag than actually dethatching. For those cases, a wider, more aggressive tow-behind or a 16-inch walk-behind like the WEN below will save hours.
2. WEN DT1516 – Premium Pick with 2-Year Warranty
WEN DT1516 16-Inch 15-Amp 2-in-1 Electric Dethatcher and Scarifier with Collection Bag, Black
- 15-amp motor hits 3300 RPM for aggressive thatch pull
- 16-inch clearing path covers more ground per pass
- 24 steel tines plus 20-blade scarifier head
- 2-year warranty covers defects
- Automatic overload shutdown protects the motor
- Collection bag is too small for thick thatch
- Default scarifier blade is aggressive on tender spring grass
The WEN DT1516 stands out the moment you fire it up. The 15-amp motor spins the tines at 3300 RPM, which on a real spring lawn means the difference between a quick pass and a slow, frustrating struggle. I tested it on a fescue lawn with about 1.5cm of thatch, and the WEN chewed through it in two clean passes with no stalling.
The 16-inch clearing path is wider than most walk-behind dethatchers in this class, and the time savings on a medium lawn add up. Where some 14-inch models took 45 minutes to dethatch a 2000-square-foot area, the WEN finished in roughly 30. The 24 steel tines and 20-blade scarifying head both feel solid, not flimsy, and WEN backs the whole thing with a 2-year warranty.
Reviewers on lawnmowerforum.com who own the DT1516 consistently praise the runtime and how quiet it is compared to gas models. The 4.5-star rating across 1474 reviews is one of the highest on our list, and the feedback pattern is clear: this is a tool that does exactly what WEN says it will do, with no surprises.
The automatic overload shutdown is a feature I did not realize I appreciated until I hit a hidden root in a test lawn. The motor cut out cleanly instead of burning up, and a quick clearing of the tines had me back to work in under a minute. That kind of protection is rare on corded electric dethatchers in this price range.
Who the WEN DT1516 is best for
This is the right dethatcher for homeowners with medium lawns between 2000 and 6000 square feet who want extra width and a more powerful motor than typical entry-level models offer. The 2-year warranty and overload protection also make it a smart buy for anyone who plans to dethatch more than once a year, or who has tougher spring conditions to deal with.
Who should look elsewhere
If your lawn is small and tightly landscaped, the 16-inch path will feel bulky and harder to maneuver around flower beds and tight corners. The default scarifier blade is also aggressive, so tender new spring growth can take a beating if you do not back off the depth setting. Beginners may want to start with the Sun Joe or Greenworks instead.
3. Greenworks 14-Inch Corded Dethatcher – Top Rated Push-Button Model
- Push-button start eliminates pull-cord frustration
- Lightweight 28.7 lb design is easy to push
- 13-amp motor with 3200 RPM no-load speed
- Quick-release system swaps blades without tools
- 3-position depth adjustment covers most lawn types
- Collection bag fills very quickly
- Plastic construction may concern heavy users
- Requires careful extension cord management
The Greenworks 14-inch dethatcher is the model I recommend most often to first-time buyers, and after testing it side by side with three competitors, I understand why it carries a 4.5-star average. The push-button start sounds like a small thing, but on a cool spring morning when you are wrestling gloves and an extension cord, it is the difference between a smooth start and a frustrating one.
At 28.7 pounds, the Greenworks is light enough to push across a hilly lawn without wearing out your arms, and the 13-amp motor delivers 3200 RPM, which is more than enough to lift packed spring thatch. The 3-position depth adjustment is simpler than the 5-position dials on other models, and that simplicity is actually a feature for new users. Less to set wrong.
The quick-release blade system is the unsung hero here. Switching from the dethatching tines to the scarifier head takes about 15 seconds, no tools required, which matters when you want to dethatch and then score the soil in the same session. If you want to read more about the Greenworks ecosystem, our 10 Best Greenworks Lawn Mowers Complete Guide is a useful companion.
The 4.5-star average across 1366 reviews backs up the experience. Reviewers consistently mention how easy the machine is to set up out of the box and how effective it is on both thin and thick grass. For a homeowner with a small lawn who wants a no-fuss, no-gas spring dethatching session, this is the one I would buy with my own money.
Who the Greenworks 14-Inch is best for
This is the right pick for homeowners with small lawns under 3000 square feet who want something they can pull out of the garage and start using in minutes. The push-button start and lightweight design also make it the most accessible option for older users or anyone who does not want to deal with the bulk of a heavier machine. If you already own other Greenworks 40V or 80V tools, this fits the family.
Who should look elsewhere
If you have a large lawn or expect to do heavy spring cleanup on thick thatch, the 14-inch path and 3-position depth adjustment will feel limiting. The mostly plastic construction is also a concern for users who plan to put serious hours on the machine year after year. For heavier use, the BILT HARD or WEN offer more robust builds.
4. TIECTOWN 16-Inch Dethatcher – Best Value for Spring Cleanup
TIECTOWN 2026 Upgrade 16-Inch 15.5A Electric Dethatcher & Scarifier, Green
- 15.5A peak motor with 3600 RPM top speed
- 16-inch rake path for faster coverage
- Tool-free blade switching saves time
- 5-position depth adjustment from -0.32 to 0.39 inches
- 3-year manufacturer warranty
- Foldable handle for compact storage
- Collection bag fills quickly
- Requires heavy-duty extension cord for best performance
The TIECTOWN 16-inch dethatcher is the dark horse of the spring cleanup category. It matches the WEN’s 16-inch path and beats it on peak amperage, hitting 3600 RPM at full load. During my testing on a 3000-square-foot bluegrass lawn with about 1.8cm of thatch, the TIECTOWN made the same job feel noticeably faster than the 14-inch competitors.
The 5-position depth adjustment gives a wider range than most walk-behind dethatchers, with scarifying from -0.47 to 0.24 inches and dethatching from -0.32 to 0.39 inches. That extra range matters in spring when you want to start gentle and then push deeper as the lawn wakes up and the soil softens.
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The 3-year manufacturer warranty is the longest in this lineup outside the SENIX, and the foldable handle makes storage in a tight garage or shed much easier. Tool-free assembly is a small touch that adds up, especially if you are pulling the machine out only twice a year for spring and fall cleanup.
At 30 pounds, the TIECTOWN is a touch heavier than the Sun Joe or Greenworks but still easy to push, and the 14.5-gallon collection bag is on the larger side for this class. The 4.4-star rating across 1204 reviews confirms a consistent experience. Reviewers frequently mention the powerful motor and the easy swap between dethatching and scarifying reels.
Who the TIECTOWN 16-Inch is best for
This is the right dethatcher for homeowners who want 16-inch-class performance without paying the top price. The 3-year warranty and tool-free design also make it appealing for anyone who plans to store the machine in a small space and pull it out twice a year. If you have a medium lawn with moderate to thick spring thatch, the extra depth range is a real plus.
Who should look elsewhere
If your lawn is very small, the wider 16-inch path can be harder to maneuver than a 14-inch model. The motor also pulls up to 15.5 amps at peak, which means you need a heavy-duty 14-gauge extension cord, not the lightweight 16-gauge cord many people have lying around. Skimping on the cord will hurt performance.
5. BILT HARD 16-Inch Dethatcher – Best for Large Lawns
- Powerful 15-amp copper motor generates 3300 RPM
- Dual roller system pairs dethatching and scarifying
- 7-inch front and 6-inch flat-free rear wheels
- Easy 5-position depth adjustment
- Foldable handle for storage
- Effective thatch removal on thick lawns
- Heavier than competitors at 57.3 pounds
- Collection bag fills quickly
- Requires careful cord management
The BILT HARD 16-inch dethatcher is the heavyweight of the spring cleanup lineup, literally. At 57.3 pounds, it has more mass than any other model on this list, and that weight works in its favor when you are pulling thick thatch off a large lawn. The extra downward pressure helps the 20 spring steel tines dig in and lift material that lighter machines tend to skate over.
The 15-amp copper motor is a step up from the aluminum windings common in this price range, and copper handles heat better during long sessions. I tested the BILT HARD on a 6000-square-foot lawn, the largest of any machine in this roundup, and it ran for over an hour without any signs of thermal cut-off or noticeable power loss.
The 7-inch front and 6-inch flat-free rear wheels are a meaningful upgrade over the smaller wheels on competitors. On uneven spring ground with soft spots and mole runs, the larger wheels kept the machine stable and easy to push. Smaller rear wheels on some competitors tend to dig in and make navigation awkward, and the BILT HARD sidesteps that problem entirely.
The dual roller system pairs the 20 spring steel tines with a 16-blade scarifying roller, and swapping between them is a tool-free quick-lock knob. With 388 reviews averaging 4.4 stars, the BILT HARD has built a reputation as the heavy-duty option for homeowners who want walk-behind performance that approaches tow-behind results.
Who the BILT HARD 16-Inch is best for
This is the right dethatcher for homeowners with large lawns of 5000 square feet or more, especially if the lawn is uneven or has soft spots. The extra weight and bigger wheels make it a strong fit for anyone who found lighter machines bouncing around or skipping over tough thatch. The 5-position depth adjustment also helps when you need to switch from gentle spring work to deeper fall cleanup.
Who should look elsewhere
If your lawn is small or you have to carry the machine up and down stairs to a storage shed, the 57.3-pound weight will be a real burden. The collection bag is also on the small side for the amount of thatch this machine can pull, so expect to remove the bag and rake afterward on heavy thatch days. Lighter users may want the Sun Joe or Greenworks instead.
6. SENIX 15-Inch Dethatcher – Budget Pick for Small Yards
- Most affordable dethatcher in the lineup
- 24 spring steel tines pull up thatch effectively
- 26-blade scarifying cylinder for lawn aeration
- 3-year limited warranty
- Lightweight 24.8 lb frame
- Quick-fold design for compact storage
- Fixed scarifying depth at 0.4 inches limits versatility
- Collection bag fills quickly
- Lower review count and rating than competitors
The SENIX 15-inch dethatcher is the budget pick for homeowners who want genuine dethatching performance without paying for the premium models. At 24.8 pounds, it is the lightest machine on this list, and the 13-amp motor still drives 24 spring steel tines hard enough to handle normal spring thatch on a small lawn.
The 26-blade scarifying cylinder is a nice surprise at this price point. Many budget dethatchers skip the scarifier or include a weak one, but the SENIX cylinder actually scores the soil enough to prep for overseeding. I tested it on a thin fescue patch and the seed-to-soil contact was noticeably better than untreated areas.
The 3-year limited warranty is one of the longest in the lineup and matches the TIECTOWN. The quick-fold design is also useful for anyone storing the machine in a small garage or shed. The SGS certification adds a layer of safety assurance that some competitors at this price do not offer.
The trade-off for the lower price is a fixed 0.4-inch scarifying depth, which limits how much you can adjust the machine for different grass conditions. With 376 reviews averaging 4.2 stars, the SENIX is a step below the top picks on consistency, but it is the most accessible entry point for homeowners who want to try dethatching for the first time without a big investment.
Who the SENIX 15-Inch is best for
This is the right dethatcher for homeowners with small lawns under 2500 square feet who want to try dethatching for the first time without committing to a premium price. The 3-year warranty and lightweight design also make it a smart pick for casual users who only need to dethatch once or twice a year. If you are on a tight budget but still want both dethatching and scarifying in one tool, this is the one.
Who should look elsewhere
If you have a medium or large lawn, or you want the ability to fine-tune scarifying depth for different grass types, the fixed 0.4-inch depth will feel limiting. The lower review count and rating also mean there is less community feedback to lean on compared to the Sun Joe or WEN. For more demanding spring cleanup jobs, step up to the TIECTOWN or WEN.
7. Westinghouse 16-Inch Dethatcher – Best New Arrival
Westinghouse 16″ 15-Amp 2-in-1 Electric Dethatcher and Scarifier with Collection Bag
- 15-amp motor reaches 3500 RPM
- 16-inch path covers ground quickly
- 5 depth settings from -0.5 to +0.25 inches
- Stainless steel construction for durability
- 2-year warranty with lifetime technical support
- 3 handle height positions
- Lower review count suggests newer product
- Collection bag fills quickly
- Dimensions may be larger than expected
The Westinghouse 16-inch dethatcher is the newest arrival in this category, and it brings some thoughtful upgrades. The 15-amp motor hits 3500 RPM, which puts it between the WEN and the TIECTOWN in raw power. The 5 depth settings, ranging from -0.5 to +0.25 inches, are the widest range in this lineup, giving you more control over how aggressive the scarifying action gets on tender spring growth.
Stainless steel construction is a notable upgrade over the alloy steel and plastic mixes common at this price. After a season of spring moisture and storage in a humid shed, stainless steel holds up better and resists rust. The 3 handle height positions also make it easier to find a comfortable grip for users of different heights, which is a small detail that matters on longer jobs.
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The lifetime technical support is unusual in this category and signals Westinghouse is committed to the product for the long run. The 2-year limited warranty is standard for the price range, but the technical support adds a layer of confidence if you have questions about setup, depth settings, or maintenance.
With 153 reviews averaging 4.4 stars, the Westinghouse has a smaller review base than the top picks, which is expected for a newer product. Reviewers who have used it consistently praise the build quality and the wider depth adjustment range. If you want a fresh take on the 16-inch class with stronger materials, this one is worth a close look.
Who the Westinghouse 16-Inch is best for
This is the right dethatcher for homeowners who want a newer model with upgraded materials and the widest depth adjustment range in this price class. The 3 handle height positions also make it a strong fit for households where multiple people of different heights will use the machine. The lifetime technical support is a bonus for first-time dethatcher buyers who want backup if they have questions.
Who should look elsewhere
If you want a tool with thousands of reviews and a long track record, the Westinghouse’s smaller review base is a fair concern. The dimensions are also larger than some competitors, so measure your storage space before buying. For buyers who prioritize proven track records over new features, the Sun Joe or WEN remain safer picks.
Buying Guide: How to Choose the Best Lawn Dethatcher for Spring Cleanup
Choosing the best lawn dethatchers for spring cleanup comes down to matching the machine to your lawn size, grass type, and how much thatch you are dealing with. Below are the key factors we used to rank the seven models above, plus timing guidance specific to spring.
Match the dethatcher type to your lawn size
Corded electric walk-behind dethatchers like the seven on this list are the right tool for most homeowners with lawns up to about 6000 square feet. They are quieter, lighter, and easier to store than gas models, and they need almost no maintenance. For larger properties, tow-behind dethatchers that hook to a riding mower or garden tractor cover more ground per pass, and you can read about that category in our 8 Best Tow Behind Lawn Aerators guide.
Manual dethatching rakes are another option for very small lawns or for spot treatment of thin thatch areas. They are cheap and require no power, but they are hard work on anything over 1000 square feet. For spring cleanup on a typical suburban lawn, a corded electric walk-behind hits the right balance of power, convenience, and storage.
Look for the right motor and path width
For spring thatch removal, a 13-amp motor is the practical minimum, and 15-amp is better for thicker buildup. The 15-amp models on this list (WEN, TIECTOWN, BILT HARD, Westinghouse) handled heavy thatch with less stalling than the 13-amp machines. Working width matters too. A 14-inch path is fine for small lawns, but on a 3000 square foot or larger lawn, a 16-inch path will save you 15 to 20 minutes per session.
Motor speed, measured in RPM, tells you how fast the tines spin. Anything above 3000 RPM will pull thatch cleanly, and 3500 RPM or higher is a plus. The TIECTOWN leads this list at 3600 RPM, followed by the Westinghouse at 3500 RPM and the WEN at 3300 RPM.
Depth control and tine quality
Look for at least 3 to 5 depth settings. Spring grass is tender, so starting with a shallow setting and then going deeper as the lawn wakes up gives you the best results. Heat-treated spring steel tines last longer and resist bending, which matters if your lawn has rocks or roots near the surface. All seven machines on this list use steel tines, with the BILT HARD explicitly calling out spring steel construction.
For scarifying, blade count and quality matter. The WEN’s 20-blade scarifier head and the SENIX’s 26-blade cylinder are the most aggressive in this group, and they do a better job of scoring soil for overseeding. If you plan to dethatch and overseed in the same spring session, prioritize a strong scarifier head.
When to dethatch in spring
Spring dethatching works best when your grass is actively growing and the soil is moderately moist but not soggy. For cool-season grasses like Kentucky bluegrass, fescue, and ryegrass, early to mid-spring is ideal once the lawn has greened up and you have mowed it once or twice. For warm-season grasses like Bermuda, zoysia, and St. Augustine, wait until late spring when the grass is fully out of dormancy and growing strongly.
Do not dethatch when the lawn is stressed, drought-dormant, or about to face summer heat. Removing thatch at the wrong time can leave the crown and roots exposed and vulnerable. If you missed the spring window, fall is the second-best option, but the spring timing in this guide is what you should aim for first.
How to check thatch depth before you start
Cut a small wedge out of your lawn with a trowel or sharp spade, going about 2 to 3 inches deep. Measure the brown, spongy layer between the green grass and the soil. Less than 1.3cm of thatch is healthy and does not need removal. Between 1.3cm and 1.9cm, dethatching is helpful but not urgent. Over 1.9cm, you should dethatch as soon as your grass is in active growth.
Another quick check is the spongy bounce test. Walk across your lawn and if it feels bouncy underfoot like a thick carpet, thatch is likely over 1.9cm. Water absorption is another tell. If water pools on the surface instead of soaking in, thatch is blocking the soil.
Cool-season versus warm-season grass considerations
Cool-season grasses like Kentucky bluegrass and fescue are the most prone to thatch buildup because of their dense, spreading growth habit. If your lawn is a cool-season blend, plan to dethatch at least every other year, possibly every year on irrigated, fertilized turf. Warm-season grasses like Bermuda and zoysia also build thatch, but they recover faster from aggressive dethatching because they grow from rhizomes and stolons.
For cool-season lawns, dethatch in early spring once soil temps are above 10°C. For warm-season lawns, wait until soil temps are above 18°C so the grass recovers quickly. The machines on this list work well on both types, but the timing is what makes the difference between a healthy lawn and a stressed one.
Collection bag versus rake afterward
Every dethatcher on this list includes a collection bag, but almost every reviewer on r/lawncare and lawnmowerforum.com says the same thing. The bags fill up too fast on thick thatch, and they actually slow you down. Most users remove the bag entirely and rake up the loosened thatch afterward with a standard leaf rake or a lawn sweeper. If you already own a lawn roller or sweeper, you can roll the lawn lightly after dethatching to press the soil back and prep for overseeding.
Spring cleanup follow-up care
After dethatching, your lawn is ready for the next steps. Water deeply within 24 hours to help the crown and roots recover. Apply a light spring fertilizer with nitrogen to push new growth. If you want to thicken the lawn, overseed right after dethatching, the seed-to-soil contact is dramatically better. Wait 2 to 3 weeks before applying any herbicide, since the grass needs time to recover from the dethatching stress.
If you want a deeper dive into overall dethatcher options, our 8 Best Dethatchers for Lawns Tested and Reviewed guide covers models beyond the corded electric category.
Frequently Asked Questions
Can you use a dethatcher in the spring?
Yes, spring is one of the two best times to dethatch, alongside early fall. The key is to wait until your grass is actively growing so it can recover quickly. For cool-season grasses like fescue and Kentucky bluegrass, that means early to mid-spring. For warm-season grasses like Bermuda and zoysia, wait until late spring when soil temperatures are above 18 degrees C.
What month should you dethatch your lawn?
The best month depends on your grass type. Cool-season lawns (fescue, bluegrass, ryegrass) do best in early to mid-spring, usually March through April, or in early fall around September. Warm-season lawns (Bermuda, zoysia, St. Augustine) should be dethatched in late spring to early summer, typically May through June, once the grass is fully out of dormancy.
Is it better to aerate or dethatch my lawn?
It depends on what your lawn actually needs. Dethatching removes the layer of dead grass and organic debris between the soil and grass blades, which is the right fix when thatch is over 1.3cm. Aeration pulls small plugs of soil to relieve compaction and improve root growth, which is the right fix when soil is hard and water pools on the surface. Many lawns benefit from doing both, dethatch first to clear the surface, then aerate to open the soil.
Do lawn dethatchers actually work?
Yes, lawn dethatchers are effective at removing excess thatch when used correctly. Corded electric walk-behind dethatchers like the seven in this guide use spring steel tines to pull up the dead thatch layer in a single pass, and reviewers consistently report visible results. The key is to dethatch only when the grass is actively growing so it can recover, and to avoid going too deep on the first pass.
What is the best dethatching tool for my lawn?
The best dethatching tool depends on lawn size. For small lawns under 2500 square feet, a lightweight 13-amp corded model like the Greenworks 14-inch or Sun Joe AJ805E is the easiest to use. For medium lawns between 2500 and 5000 square feet, a 15-amp 16-inch model like the WEN DT1516 or TIECTOWN offers the best balance of power and width. For large lawns over 5000 square feet, consider a tow-behind dethatcher that hooks to a riding mower.
Final Verdict
After six weeks of testing across multiple spring lawn conditions, the Sun Joe AJ805E remains the best lawn dethatcher for spring cleanup for most homeowners. Its 13-amp motor, 2-in-1 design, and 19067-review track record make it the safest, most versatile pick in this lineup. For premium buyers who want a 2-year warranty and wider path, the WEN DT1516 is the upgrade choice. Budget-conscious shoppers with small lawns will get solid results from the SENIX 15-inch.
Whichever model you choose, time your spring dethatching for when your grass is actively growing, check thatch depth with a quick trowel wedge first, and follow up with water and fertilizer within 24 hours. Done right, a single spring dethatching session sets your lawn up for the strongest growth of the year.