Soil & Turf · Field Notes
It usually isn't the heat. It's what's underneath — and you can see the difference in about four seconds.
Every year it happens the same way. May and June the lawn looks like a magazine. You fertilized, you mowed, it greened up fast and you felt good about it. Then late July turns, and by the first week of August the color goes flat. Thin patches show up in the same places they showed up last year. You water more. It helps for a day.
Most people blame the heat. Heat is what changed, so heat must be the problem.
It usually isn't.
The part nobody looks at
It's root depth
Two lawns can sit side by side, take the same sun, the same water and the same fertilizer, and one of them holds through August while the other quits. The difference is almost never above ground.
A lawn with a shallow root system is living off the top two or three inches of soil. That layer is the first thing to dry out and the last thing to hold nutrients. When July gets long and hot, that grass has nothing to reach for.
A lawn with deeper roots is drawing from soil that stays cooler and wetter, and it rides the same weather out.
So the real question isn't how to survive August. It's what builds roots in the months before it.
What the research actually found
This is where it gets interesting, because the turf science is more specific than most people realize — and more honest about its limits than most product labels are.
Root mass is the most replicated effect in the humic acid literature.
Root mass increase in Kentucky bluegrass from foliar humic acid during establishment (34% from a second humic source). The same trial found no change in tiller density or visual quality — roots moved, the look of the grass didn't. Ervin, Zhang & Roberts (2008) · Acta Horticulturae 783:317–322
Average root dry weight across a meta-analysis of 81 studies and more than 700 data points. Rose et al. (2014) · Advances in Agronomy 124:37–89
Nitrogen use efficiency across 120 field trials, with nitrogen uptake up 17% — the grass got more out of the fertilizer that was already there. Ma, Cheng & Zhang (2024) · Agronomy 14(12):2763
And it works best exactly where a struggling lawn lives. Across the literature, humic substances show the largest effects in soils low in organic matter and on plants under stress. Researchers at NC State put it plainly: the benefit is “less evident on a putting green containing significant organic matter.” Tired, compacted, worked-over soil is the case where it has the most room to help.
Why more fertilizer doesn't fix it
Fertilizer feeds the plant. That's its job, and it does it well — nitrogen is still the single biggest driver of how a lawn looks.
But nitrogen feeds the blade. It produces top growth, which is exactly what you see and exactly why quick-release products feel like they worked. What it doesn't do is change the soil the roots are living in.
If the soil is tired, the grass keeps producing the shallow root system it can afford. You can green it up every spring and watch it fail every August, because you're treating the part you can see.
The problem isn't that you're not feeding enough. It's that you're feeding the wrong half.
What feeding the soil actually means
Humic acid doesn't feed grass. It works on soil biology — the microbial activity that makes nutrients available and that root systems develop into. That's a slower, less visible mechanism than nitrogen, and it's why humic products don't produce the dramatic week-two green-up that fertilizer does.
Sea kelp works differently again. Three independent meta-analyses — one covering 198 studies and over 2,000 treatment comparisons — converge on roughly 15–16% average benefit, strongest in stressed and low-fertility conditions. One study settled the mechanism neatly: when researchers ashed the extract to destroy the organic fraction and leave only the minerals, the benefit disappeared entirely. It isn't the micronutrients doing the work.
Read this part
What it won't do
- It will not hold water in your soil. A Utah State study found humic acid actually decreased soil volumetric water content on putting greens and required more frequent watering, not less. Anyone telling you a humic product improves moisture retention is ahead of the evidence.
- It will not make your lawn heat-tolerant on its own. The NC State researchers were blunt: “Application of humic substances did not result in significantly improved heat tolerance.”
- It will not replace your fertilizer. In two-year field trials, nitrogen rate remained the primary determinant of turf quality. Humic added to a fertilizer program helped; humic alone performed barely better than doing nothing.
- And it will not do anything in a week. Half the studies in the largest meta-analysis showed growth responses under 5%. The averages are carried by a minority of strong responders — usually in poor soil, under stress, over a full season.
If you want your lawn to look different by Friday, buy nitrogen. This is a different tool for a different job.
Why we made one
We didn't set out to sell anything. We farm in Laurel, Delaware, and our own ground got tired.
We'd been doing what everybody does — feeding the crop, not the dirt. More fertilizer stopped moving the needle. So we started feeding the soil instead, and after a season the biology came back. We ran it on our own ground before we ever put it in a jug.
Humic+ is a soil conditioner — humic acid, sea kelp and fulvic acid, made with OMRI listed ingredients. It is not a fertilizer and it is not a replacement for one. It goes down alongside whatever program you already run.
- Sizes
- 32 & 128 oz
- 32 oz makes
- 32 gallons
- 32 oz covers
- 32,000 sq ft
- Cost
- 56¢ / 1,000 sq ft
One pass, once a season. Goes down with the program you already run.
Shop Humic+ — from $17.99Ships free from our farm in Delaware · 30-day money-back guarantee
Prefer Prime? Find the 32 oz on Amazon
The honest pitch
Nobody is more suspicious of a jug of promises than a farmer. That's exactly why we built our own, and it's why this page tells you what the research doesn't support alongside what it does.
The roots you build now are the lawn you keep in August. That's not a slogan — it's the mechanism, and it runs on the soil's clock, not yours.
Not by Friday. By harvest.
Feed the soil this season and let it work.
Get Humic+ — from $17.9932 oz covers 32,000 sq ft · 128 oz covers about three acres · Free shipping
Prefer Prime? Find the 32 oz on Amazon
Fourth generation · Laurel, Delaware
Sources — Ervin, Zhang & Roberts (2008), Acta Horticulturae 783:317–322 · Rose et al. (2014), Advances in Agronomy 124:37–89 · Ma, Cheng & Zhang (2024), Agronomy 14(12):2763 · Cooper & Liu, NC State turfgrass research summaries (1999–2000) · Van Dyke, Johnson & Grossl (2009), Soil Use and Management 25:225–231 · Lindsey et al. (2021), Agronomy 11(2):395 and 11(4):611 · Pérez-Oñate et al. (2026), Frontiers in Plant Science 17:1803269 · Pei et al. (2024), PLOS ONE 19(7) · Zhang & Schmidt (1999), Crop Science 39(2):545–551.