Practical guidance for homeowners across The Woodlands and Greater Houston — from people who work in these yards every day.
Clay soil, Gulf Coast heat, and unpredictable rain make fertilization here genuinely different. This is the schedule we actually use on our clients' properties — not a generic Texas guide.
Spring is when irrigation problems show themselves — and the worst time to discover you have one. Here's what to look for before the growing season starts.
If you've ever put fertilizer down in The Woodlands and watched your lawn go from lush to burned, or applied it at the wrong time and seen no results at all, you're not alone. The clay-heavy soil, hot summers, and unpredictable late-season rains in our area create conditions that are genuinely different from what most fertilizer bag labels assume.
After decades of maintaining lawns across The Woodlands, Spring, Spring, and Greater Houston, we've developed a fertilization approach that actually works here. This is the schedule we use on our clients' properties — not a generic Texas guide, but one built specifically for this region's soil conditions and climate patterns.
Most of The Woodlands sits on heavy clay soil with poor drainage. Clay soil holds nutrients longer than sandy soils, which means you need less fertilizer than you might think — and applying too much, too fast, is one of the most common mistakes homeowners make.
TruLeaf Tip: In The Woodlands, soil pH often runs slightly acidic. If your lawn isn't responding well to fertilizer, low pH might be the issue — lime applications can correct this and dramatically improve fertilizer uptake.
| Month | Application | Notes |
|---|---|---|
| February | Pre-emergent herbicide | Apply before soil temps reach 55°F. Prevents crabgrass and other summer weeds. |
| March–April | Slow-release nitrogen (15-5-10) | Apply once lawn is actively growing — usually after 2nd mow. |
| May | Iron supplement (optional) | Keeps St. Augustine deep green without pushing excessive growth. |
| June–July | Light slow-release nitrogen | Avoid high-nitrogen products in peak heat. Skip if in drought. |
| August | Potassium application | Strengthens cell walls and improves drought resistance. |
| September | Balanced fertilizer (fall prep) | One of the most important applications of the year. |
| October | Pre-emergent (round 2) | Prevents winter weeds like annual bluegrass and henbit. |
| Nov–Jan | None | Warm-season grasses are dormant. Fertilizing pushes vulnerable growth. |
The most common grass in The Woodlands. St. Augustine is a heavy nitrogen feeder during its growing season but is also the most sensitive to over-fertilization. Stick to slow-release nitrogen and never fertilize a lawn showing signs of disease.
Bermuda can handle more nitrogen than St. Augustine and benefits from more frequent applications during summer. You can add a light application in late May and again in mid-July without the same disease risk.
Zoysia is the most forgiving of the three. It's slower growing, so it requires less nitrogen overall — use smaller amounts at each application.
Bottom line: In The Woodlands, the two most common mistakes are applying too much nitrogen in summer and skipping the September application. Get those two things right and your lawn will look dramatically better year-round.
Spring in The Woodlands means warmer temperatures, longer days, and the start of lawn season. It also means your irrigation system is about to get its first real workout after winter — and if there's a problem, now is when you're going to find out about it.
The frustrating thing about irrigation issues is they're often invisible until they've already caused damage. A slow leak soaks the soil near your foundation for months before you notice it. A head that's lost arc coverage leaves a dry patch that looks like a disease problem. A stuck valve runs at 3am and you wonder why your water bill doubled.
If a section of your lawn looks consistently dry despite running the system, the problem is almost always a coverage issue — not the grass itself. Common causes: a head that won't pop up fully, a clogged nozzle, a head spraying the wrong direction after being struck by a mower, or a zone that simply isn't activating.
Wet spots after watering (or without any watering) indicate a leak — either at a head, a lateral line, or a valve. These waste significant water and can cause root rot, fungal outbreaks, and even foundation issues near the house.
Important: Don't ignore soggy spots near your foundation. Irrigation leaks in this zone can undermine soil structure and cause costly structural issues over time.
If your bill spikes unexpectedly — especially in spring when you're starting the system back up — you likely have a valve that's stuck open, a significant underground leak, or a zone that's running far more than programmed.
A zone that won't run at all typically points to a valve failure, a wiring issue, or a controller problem. This is one of the most common issues we see in spring startups, especially after mild freeze events.
Signs include a blank display, programs that have reset after a power outage, the system running at random times, or certain zones not responding to manual activation. Controllers have a lifespan — if yours is 10+ years old and acting up, replacement is often more cost-effective than repair.
Before you start running your system regularly each spring, walk each zone while it's running and look for: heads that don't pop up fully or stay stuck up after the zone shuts off; heads spraying pavement, fence, or your house instead of turf; pooling water anywhere in the yard; and any obvious physical damage to heads from mowing or landscaping work over the winter.
TruLeaf offers full irrigation system assessments as part of our spring startup service. We run every zone, check every head, test the controller, and give you a written report — with no obligation to hire us for repairs.