Why is my overseeding failing to grow?
Bare seed baking in direct sunlight results in poor growth, while failing to keep the grass continuously watered—even after it reaches four inches tall—kills new development. These missteps prevent Bermuda grass from successfully filling in bare spots.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Throwing down seed and relying on rain or minimal watering
- 2Using peat moss to cover seed and keep it moist
- 3Using Tenacity to prevent weeds from new topsoil
- 4Waiting for the grass to spread naturally
- 5Dumping lawn clippings on the spot to decompose
- 6Cutting the grass often, low, and watering weekly
- 7Using leaf blowers or vacuums modified to distribute seeds
- 8Using standard drop or cast spreaders
- 9Spreading grass seed by hand with a small bucket
- 10Throwing down cheap fescue seed and covering it with woodchips or straw
- 11Wondering if a post-emergent or rescue treatment can be applied after grass has already sprouted
- 12Using a thatching rake to bag up dead material and leaving the rest to decompose in the soil
- 13Hitting the worst spots with a shovel to lift the weeds fully before top-dressing
- 14Using a large propane torch to burn off the remaining debris
- 15throwing down leftover seed into thin spots, top dressing, and trying to keep it wet by hand as best as possible
- 16using peat moss instead of straw for better water retention in bare spots
- 17waiting for the existing grass to fill in naturally without adding more seed
- 18None mentioned in the thread
- 19cutting back on watering due to high utility bills
- 20mowing every two weeks
- 21applying only Epsom salt in the spring instead of standard fertilizer
- 22Consulting beginner guides for lawn maintenance instructions
- 23Waiting patiently to see if surface seeds eventually germinate
- 24Applying a light layer of top dressing over seed to retain moisture
- 25Maintaining consistent light watering multiple times a day
- 26Adding top soil or peat moss to improve moisture retention
- 27Applying preventative fungicides like azoxystrobin to mitigate disease risks from extended watering
- 28Extending daily watering schedules for several extra weeks
- 29Running multiple zones manually by moving hoses throughout the day
- 30Investing in an underground automatic irrigation system
- 31Adjusting watering frequency and duration based on personal trial or advice from others
- 32Asking for human advice on online forums
- 33Consulting AI tools like Google Gemini for recommendations
- 34leaving the seeds without midday watering during long work shifts
- 35relying on natural germination without continuous moisture based on test spots
- 36Applying disease ex and menoxofam to fight the infection
- 37Throwing down disease ex granular during seeding for preventative purposes
- 38Save the seeds for thin spots in a few weeks
- 39Chuck the seeds in the shed and forget about them for years
- 40Asking local nurseries for recommendations
- 41Seeking second opinions online
- 42Triple check with the company on the phone beforehand
- 43Watch the technician closely on the day of the appointment to stop them
- 44Help remove seeds from the equipment and empty leftovers before they start
- 45Waiting for the lawn to get tall and then mowing with a bag to keep clippings off the sprouts
- 46Applying starter fertilizer at lower rates like 0.5lb of N
- 47Redoing thin areas with a garden rake, quality topsoil, and more seed
- 48Watering once in the morning and once in the afternoon
- 49Using a hose in the morning and a sprinkler in the afternoon for about 30 minutes on each lawn
- 50Performing a tuna can test to check water depth
- 51Using a surfactant like Johnson & Johnson baby shampoo to fix hydrophobic soil
- 52Mowing very low right at or just slightly below 2 inches to shock existing grass
- 53Using a plant growth regulator (PGR)
- 54keeping water consistent to help dilute the chemical and give seeds a fighting chance
- 55waiting to see if it germinates and doing another round of seeding later if needed
- 56Delaying pre-emergent application until fall and overseeding in the spring
- 57Laying cardboard over repair spots to deflect weed preventer granules
- 58Growing replacement grass plugs in separate pots
- 59Using mesotrione to allow some seeding while managing weeds
- 60Applying starter fertilizer on the same day as planting
- 61Waiting to apply fertilizer until after seed germination
- 62Using budget-friendly or local commercial fertilizer brands
- 63Ordering same-day delivery seed from a local home improvement store due to time constraints.
- 64Throwing down seed and fertilizer in the fall without proper watering, accepting lower germination rates
- 65Relying on the lawn to fill in on its own over the fall
- 66Waiting until next year and focusing only on root establishment for the current season
- 67doing a hybrid watering schedule with short bursts for new grass and deeper watering for established grass
- 68Reading beginner guides and checking online resources
- 69Keeping the robot mower turned off for a few weeks until new seedlings come up.
- 70Mowing very low before seeding to buy time before the existing grass gets too tall.
- 71Cutting the existing lawn low before overseeding to buy time between mows
- 72Waiting until the new seed reaches 2 inches before mowing
- 73Trying to stay off the lawn and avoid pivoting when finally mowing
- 74Running irrigation frequently and hoping for the best
- 75asking for step-by-step guidance on forums
- 76skipping seasons to kill and remove weeds first
- 77Using a fall/winterizer blend instead of a dedicated starter fertilizer
- 78Sourcing a readily available local brand when ideal options are limited
- 79Using a manual reel mower on patched areas instead of a large riding mower
- 80Holding off on mowing the entire lawn until the new seedlings are established
- 81Mowing early and often based on agricultural extension guidelines.
- 82Buying restricted herbicides from out of region, nuking the entire lawn with Roundup before reseeding, or simply throwing seed down now and letting the weeds and grass compete.
- 83Scalp then dethatch, pull weeds if desired, then overseed and clear out dead material blocking seed-to-soil contact.
- 84Using 41% glyphosate to kill remaining weeds before seeding
- 85Consulting beginners guides and comparing seed brands for weed purity
- 86Checking the product label for re-seeding restrictions
- 87Raking dead spots, applying topsoil, laying down seed, and keeping it moist
- 88Hitting patch areas with a quick extra sprinkle in the afternoon to keep the new seed from drying out.
- 89Aerating and using a tow-behind broadcaster to create holes for seeds
- 90Using a garden weasel on grade drop areas where machinery does not work well
- 91Using a manual reel mower for small areas while avoiding large mowers on new grass
- 92Waiting until seedlings reach about three inches tall before the first mow
- 93Waiting 2 to 4 weeks before the first mow
- 94Delaying afternoon waterings temporarily to let the soil dry out before mowing
- 95Using a zero-turn mower carefully to avoid damaging the turf
- 96Waiting until seedlings reach a specific height before mowing
- 97Applying starter fertilizer at the time of seeding versus waiting until after germination
- 98Using a manual reel mower or push mower to avoid damaging seedlings
- 99Throwing down seed while aerating and guessing on timing
- 100Leaving cores on the ground to break down naturally
- 101Doing traditional lawn prep like removing old grass, adding topsoil, and cutting before laying sod
- 102Checking manually for pooling water or wet soil before scheduled cycles
- 103waiting to see if grass fills in on its own after a few mows
- 104overseeding larger patches while leaving smaller ones
- 105waiting until spring next year to fix thin areas
- 106Doing the aeration and overseeding annually in early fall instead of spring.
- 107Scratching up bare spots, laying more seed, and top dressing
- 108Performing a heavy dethatching or scarifier pass to expose soil for better seed contact
- 109Spreading a thin layer of topsoil or compost over the debris and seed
- 110Using a rotary cultivator or tiller to loosen the top layer of soil
- 111Relying on core aeration to handle compacted soil and moss
- 112Changing the daily watering duration and frequency
- 113Considering a light dethatching and another round of overseeding
- 114Looking into using mesotrione for weed control
- 115Driving out of state to purchase banned chemical killers
- 116Using preventative products instead of overnight killers
- 117Switching to non-chemical approaches like milky spore
- 118Waiting 3 to 4 weeks for grass to establish before the first mow
- 119Avoiding mowing entirely during the initial growth stage
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“10 days post, seedlings coming in very nice. Probably 2-3 inches for most. Mow/starter fert now or wait a couple more days?”source ↗
“Can't say I like its chances but is this going to work?”source ↗
“Had 1 major section in backyard affected by it (heavy shade), and 2 other spots that thinned out a little bit from it.”source ↗
“This was my first attempt at overseeding by hand. I would appreciate any tips or tricks. You guys have especially in shady areas.”source ↗
“Now I'm wondering if thatching with a rake isnt enough and I need to take my shovel to whole area to get the weeds up before I put the loam down??”source ↗
“What I cannot figure out is whether overseeding at the same time would have made it even better or if that was just unnecessary.”source ↗
“Hard? No. But it can be time consuming depending on the amount of land you need to cover.”source ↗
“hired a big company to Core Aerate only, several times on the phone I confirmed.”source ↗
“Day of the appointment comes, and the technician was ready to overseed as well if I don't stop them.”source ↗
“I had to help them remove the seeds from the Machine and make sure they empty any leftovers on the streets before going into my lawn.”source ↗
“We've had an incredible amount or rain and my existing lawn is growing fast. At what point should I mow after overseeding??”source ↗
“All traditional wisdom said to mow low, seed, then let it grow for a month+.”source ↗
“Am I crazy?”source ↗
“I have a little over 3,000 sq ft of lawn that I’m trying to overseed, and I swear the prep never ends.”source ↗
“At this point I feel like if I keep going, I’m going to rake my entire existing lawn into oblivion.”source ↗
“I feel like I’m losing my mind over grass at this point.”source ↗
“In 6a and I over applied tenacity at around 1.6x-1.75x rate on a full reno on seed day of resilience 2. Safe to say I have my own little science experiment going.”source ↗
“Will using Tenacity on 50% fine fescue be a death sentence?”source ↗
“Hey guys, i Dethatched, aerated, and overseeded my front lawn and side lawn. The side yard is starting to turn green and new grass is growing, but my front lawn is as brown as ever with some grass growing. Is there anything I can do to turn that grass green and help the new grass grow?”source ↗
“First-time homeowner, Boston area (Zone 6b). I overseeded over Labor Day weekend with Twin City Blue Resilience (TTTF + KBG) to fill bare spots and repair areas damaged by summer heat/drought.”source ↗
“Would you keep mowing at ~2" every 1–2 days with the robot, or leave everything alone longer to let the new TTTF/KBG establish?”source ↗
“should I hand pull the weeds then scalp and overseed or am I good to just scalp and overseed.”source ↗
“Most likely over thinking the hell out of this but wanted to see what the sub thinks.”source ↗
“My entire yard is this yellow dry mess that crunches under your feet if you walk on it. Can this yard be saved and how? I’m renting this place so any options that don’t require sodding or spending a lot are appreciated.”source ↗
“My ideal overseed window is quickly approaching its end. (September 15th). I need to lay down some fall fertilizer as well.”source ↗
“How would you set up your irrigation schedule for overseed (with some leveling) in MA state?”source ↗
“Ground was wet today at 7am and it's set to water again at 8am. Am I overdoing it? As long as you don't see pooling, is it possible to over do it?”source ↗
“What is my best course of action for Bermuda grass to eventually fill in the spots?”source ↗
“Did I screw up by not applying Tenacity before seeding?”source ↗
“I overseed my whole lawn about 2 weeks ago.”source ↗
“I have grass but I also still have weeds including a lot of crab grass.”source ↗
“Did I screw up and is there something I could or should apply at this point?”source ↗
“However, there’s several areas where things are pretty thin.”source ↗
“First time Overseeding. Fertilizer next?”source ↗
“Do I fertilize next? My water schedule as of now is 20mins per zone(total yard is probably 40ish mins total, 2 days a week.) I’m not completely obsessed, but just want to keep a decent lawn. Any advice on fertilizer/next cut/watering?”source ↗
“I’m just not sure when it'll be safe to let it loose again after overseeding.”source ↗
“I just started to overseed when I was raking and noticed some grubs. I raked some more and more and kept pulling up carpets of grass. So many grubs.”source ↗
“Where I am I can’t find any 24 hour killers. They’re all banned in NY. There’s prevention stuff, but no overnight.”source ↗
“What do I do about seeding? Do I put the preventative stuff down with the seed and hope for the best?”source ↗
“After about halfway through the yard I panicked and spread all my seed because I wasn't sure if it was better to spread over the seed or under the seed.”source ↗
“My question is, are the seeds that sat on top of the soil/compost mix cooked? Should I do anything like lightly agitate that area or spread a very light layer of soil/compost to try and increase seed to soil contact? Or should I just remain patient and reassess in a few more days?”source ↗
“Headed into cool season next month in Phoenix. Need help with what to add to perfect this.”source ↗
“Any suggestions? Below I’ll add what Google Gemini recommends I do but I can’t trust AI so any advice is appreciated!”source ↗
“What should my target rate of Nitrogen be for the first application (I didn't apply any at overseeding)?”source ↗
“It's time to lay down dithiopyr for Poa and crabgrass, but my dogs continue to kill the grass in spots. What's the best technique for doing both?”source ↗
“I’m in Southern Oregon so I have cool season lawn (PRG) and am overseeding but always wondered when people put down starter fertilizer after planting…. Is it same day, one day later, 5 days, once germination happens…?”source ↗
“I saw a stretch of rain for a week and scrambled to overseed before it started.”source ↗
“Didn’t have time to search around for seed so just got what Home Depot could deliver same day.”source ↗
“Am I going to be happy or disappointed when it comes up?”source ↗
“I’ve been going out once maybe twice a week/ day to check sprinklers and make sure everything is sufficiently damp. Is this too much foot traffic? How much risk is there of the seed getting matted down in the topsoil?”source ↗
“Looking to overseed my patchy front lawn with a 50/50 rye/bluegrass mix.”source ↗
“My understanding is that I need to aerate prior to seeding. Is there anything else I should do prior to spreading seed? Do I need to cut it really low? Do I need to dethatch?”source ↗
“Do I need to follow the same steps as the front yard or is it different in anyway?”source ↗
“Should I mow before adding second round of seed?”source ↗
“There are areas where KBG has just started to germinate, but my existing lawn is also quite long. I use a 42” ZT so not exactly gentle.”source ↗
“Leaning towards just holding off mowing until 5 weeks (2 weeks after this new TTTF), but curious if letting the existing lawn get very long is an issue”source ↗
“What’s the golden rule on mowing after Overseeding?”source ↗
“My existing grass is getting long. Is it OK to mow 2.5” and then put down my starter fertilizer?”source ↗
“Or simply put down fertilizer and skip mowing for another week?”source ↗
“There are some patches that didn't germinate. When should I add more seed?”source ↗
“Here’s my concern: over the last couple of days I’ve started noticing a meaningful number of yellow blades among some of the new grass.”source ↗
“Bare seed baking in the direct sunlight gives me shitty growth, in my experience.”source ↗
“Biggest mistake has gotta be watering. Still gotta frequently water it even after your new grass is 4 inches tall”source ↗
“I have several 1ftx1ft to 3ftx3ft bare patches in my yard.”source ↗
“I'm renting so dint want to really spend much, but am tired of stepping in mud and sand after any light rain or foggy morning.”source ↗
“I'm in the same situation at you and will be doing the same thing. I overseeded 15 days ago and am very disappointed with the results.”source ↗
“I water about once a week for about 45 minutes, but our light bill was $400 so my mom has made me cut back.”source ↗
“I haven't fertilized at all except for Epsom salt that gets watered in in the spring. I mow every two weeks”source ↗
“Threw down blue resilience nearly 3 weeks ago. I added top soil to some areas before seeding, and a good amount of those top soil areas have remained quite bare.”source ↗
“I had this exact situation last fall. Decided after a few weeks that some spots needed more work so I ordered more seed.”source ↗
“Anyway it looked really good this spring but now I’ve lost most of it to disease and am starting over tomorrow”source ↗
“I have been watering it three times a day, but I work as a paramedic on 24-hour shifts. I plan to water it in the morning before my shift. How much will the seedlings be affected if they are not watered for the rest of the day until I get home the next day, given that it is supposed to be sunny and in the mid-70s?”source ↗
“What do you normally do with extra seeds? Do I throw it down on my lawn or wait to see which areas need a touch up?”source ↗
“With the fall season coming up I have a few questions on the order of tasks and some general inquiries for fixing small bald patches”source ↗
“Do I overseed or fertilize first?”source ↗
“What ratio fertilizer do I generally want to use?”source ↗
“Topsoil/Leaf Compost/Manure to use when fixing those bald patches?”source ↗
“Not everyone’s trying to turn their yard into a science experiment when they just wanted some holes punched for drainage.”source ↗
“I actually have the same issue where the areas of existing grass aren't thickening up, but the few areas where i added topsoil for leveling are clearly doing better.”source ↗
“The lawn gets its ass beat by the sun everyday.”source ↗
“once I get the seed down, fertilize, and start watering, my existing grass is going to take off. Max length I will be able to go without needing to mow (4”+ height) is going to be about a week.”source ↗
“I didn’t use a PGR and my existing grass is growing fast.”source ↗
“First time home owner trying to be a professional is my problem lol. Should've seen my face once I re did the math to double check after my application haha.”source ↗
“I did this once too and it turned out fine”source ↗
“Is it too late to bother overseeding? Maybe it will fill in on it's own over the fall.”source ↗
“I already asked to push back winterizing but she said that's when they are starting this year.”source ↗
“and I can ignore all the existing surge that is down? Since raking it apparently will simply spread seeds.”source ↗
“How long should I wait to apply some Urea after over seeding? I was thinking after the first mow 2-3 weeks in, thoughts?”source ↗
“Worried that if I’m adding too much water to the new grass, it will damage it.”source ↗
“I cut it to 1.5 inches, the lowest I could go in my lawn.”source ↗
“Curious to see what ppl say given you have a robot mower, last year when i overseeded i cut the existing lawn low to buy myself some time between mows.”source ↗
“25lb bag sounds like too heavy of an overseed”source ↗
“About 500 sq feet. All recommendations on this sub were to do 4-8x the recommended usage by the manufacturer. I guess I overdid it…. What’s the worst that happens here?”source ↗
“Is this fertilizer appropriate for an application on top of overseeding?”source ↗
“I want to lay down a fertilizer to get things moving since I'm late into the season for the overseeding.”source ↗
“Is this fertilizer appropriate for that.”source ↗
“After killing my grass just over 3 weeks ago by using 24D in 95 degrees I'm planning on starting to seed next weekend or the weekend after”source ↗
“I still have many weeds in my yards and was planning on using 41% glyphosate to kill it all then seed a couple days after”source ↗
“do I need to adjust the watering to see germination from the touch up seed? Or do you guys think I can leave it as is?”source ↗
“The established grass will probably steal most of the moisture before that top layer gets a chance to stay damp, you might need to hit those patches with a quick sprinkle in the afternoon to keep the seed from drying out.”source ↗
“Getting ready to overseed but I can’t decide if I should rent a slit seeder locally for $150 for the day, or just aerate and use my tow-behind broadcaster.”source ↗
“bc I do have some trouble spots that never seem to keep.”source ↗
“my only issue is that my grading sucks so it wouldn't work well in grade drop areas”source ↗
“I’m nervous about mowing the new grass but my property is way too big for using the reel mower exclusively. Can I mow yet and should I just use the reel where the bare patches were?”source ↗
“I don’t mow until new seedlings are around 3in and only because my established grass is just too long at that point. But it’s hardier than you think, if you have to mow just go for it.”source ↗
“I got to two weeks before my existing grass started seeding and I had to mow. Don’t understand how some people are waiting 3-4 weeks.”source ↗
“Existing lawn was long af, like >6”. Had to mow”source ↗
“Mine sprouted and stalled. Been stuck at like 3/4" for 2 weeks.”source ↗
“I was thinking the existing grass would become toxic sludge , releasing that sludge in the root zone of the new sod , only time will tell”source ↗
“That sod's gonna cook itself on top of 3 inches of existing grass before it ever roots down into anything useful”source ↗
“This is what worries me, that I might miss my window to out more seed down if it takes too long”source ↗
“I learned this lesson as well this season; ordered more seed 10 days post seeding (on the early side) and got it down at the 23 day mark.”source ↗
“We have this done annually and it’s usually promoted for early fall but I’m wondering if early spring would be better?”source ↗
“12 days post overseed and I’m seeing new grass coming in spotty in the bare spots. Seems to only be coming in where the seed went in aerator holes.”source ↗
“It just feels like they’re growing extremely slowly. This spot, for example, has looked almost exactly like this for weeks.”source ↗
“Day 5 is about 9-16 days short of mow time in my opinion.”source ↗
“I have spent a day trying to dial it in and I just cant seem to get every sqft covered.”source ↗
“Its a bit of a drive coming home from work and its a lot of running around outside and I'm wondering if theres an easier way to do it.”source ↗
“This watering regiment is my least favorite part so far lol. Makes me want to invest in an irrigation system, my current setup certainly doesnt feel sustainable.”source ↗
“The existing lawn is growing up at a much faster rate than I expected, and I'm concerned about it making it another three weeks to a first mow without becoming a forest.”source ↗
“We seeded in the spring but got hit with water restrictions and are covered in weeds now. Should I use a thatcher before seeding?”source ↗