NJ Lawns Community

Hey everyone, I'm completely freaking out here. I live in Ridgewood and woke up yesterday morning to find that roughly half of my backyard lawn turned brown literally overnight. I've got irrigation running every morning at 6am for about 20 minutes, and it was looking fine the day before. Now it's like someone just threw a blanket of dead grass over half my yard. There's also these weird water-repelling spots when I try to hose down the brown areas - water just beads up and runs off. Is this hydrophobic soil?? I'm panicking because we just bought this house last year and I have no idea what I'm doing. The lawn is supposed to be tall fescue and KBG mix. What do I do?? Need help ASAP!!!

Oh wow, that sounds exactly like hydrophobic soil! I've dealt with this in my backyard in Tenafly a few years back. It's actually more common than people think, especially around here after we had that dry spell in early summer. The organic matter in the soil decomposes unevenly and creates a waxy coating that repels water. Have you done a soil test yet? Also - stop watering for now until you figure out what's going on. You're just wasting water if it can't penetrate anyway. I'd recommend getting some wetting agents (there's a good one called Soil Moist at Garden State Garden Center in Paramus) and definitely aerate the heck out of those dead spots. What does the rest of your lawn look like? Is the green part actually healthy or is it just not as obvious yet?

Compacted soil more likely, honestly. Quick way to check - take a screwdriver and try to push it into the ground. If it's hard to get in past a couple inches, you've got compaction issues. That would explain why water is running off instead of soaking in. I'm a pro landscaper in the area and see this ALL the time in Ridgewood yards, especially ones that were newly built. The builders compact everything during construction and then sod gets laid on top without proper preparation. For the brown dead spots though, that's probably fungus - maybe brown patch or dollar spot which hits KBG hard when we get those humid nights. What's your mowing height? If you're scalping it, that weakens the grass and makes it vulnerable. Honestly for immediate relief, I'd hit it with a fungicide (Heritage or Concert II work well) and get on a program with some aeration starting next week. Does the dead part pull up easily like a carpet?

@SoilScientist OMG YES - the dead part pulls up like a carpet!! That's really scary. And I don't think I've aerated ever since we moved in. Builder did the sod last August and honestly I just assumed it'd take care of itself. My mower is set to like 2.5 inches - is that too low?? I'm so confused because the front yard looks totally fine. Only the back - and only half of it! Does this mean my whole backyard is doomed?? Also, should I just start over? My neighbor in Glen Rock said I should just rip it all out and seed tall fescue because it's more drought tolerant. Is it worth waiting to see if it comes back or am I fighting a losing battle here??

Wait wait wait - pulling up like a carpet?? That's root rot territory, not just hydrophobic soil. That means fungus got into the crowns. You're definitely looking at brown patch or some kind of root disease. DON'T listen to your neighbor about reseeding right now - that'll just waste money if the fungal problem isn't fixed first. For what it's worth though, tall fescue IS a better choice long-term for our area. It's more heat tolerant and handles our inconsistent summers better than pure KBG. But you've got a bigger problem first. I'd call in a pro for a proper diagnosis honestly - take some samples to the Rutgers cooperative extension in Hackensack, they'll ID it for cheap. In the meantime - don't mow those dead areas, don't fertilize (nitrogen feeds fungus), and definitely don't water heavily until you know what you're dealing with. Light watering once a week max if we don't get rain. Also - what's your irrigation set to run? Morning is correct but you might be overwatering. We're in July/August now, your lawn doesn't need more than an inch total per week including rainfall.

@NewbieNate Yeah, 2.5 inches is way too short. For tall fescue in NJ, you want 3.5 to 4 inches minimum during summer. That could definitely be contributing stress. And if you're watering daily, that's actually BAD - you're creating shallow roots and perfect conditions for fungus. Here's what I'd do: First, get a soil test done through Rutgers ($15 and they'll tell you exactly what's lacking). Second, hit those dead spots with Propiconazole or Triticonazole fungicide - apply now and again in 2 weeks. Third, raise your mower ASAP. Fourth - cut irrigation to 2-3 times per week deeply, like 45 min sessions early morning, so maybe .5 to .75 inch each time. Less frequent deep watering beats daily shallow watering any day. Once you get the fungus under control in fall, then you can overseed those bare spots with a good tall fescue blend. I use Site One Landscape Supply in Waldwick - they've got quality seed. Don't make the mistake of trying to fix this overnight, it's a process. Happy to help more if you have questions!