Fixing Poor Drainage and Choosing Grass for a Stockton, CA Lawn

A Stockton homeowner has a low, poorly drained backyard spot where grass grows sparsely. They ask about gypsum, seed type, timing, and seasonal tasks.

Gypsum Won't Fix Drainage

Gypsum only helps high-sodium clay. It must be tilled in deeply—not topdressed. For true drainage issues, install a French drain.

Drainage Solution

1. Trench 12–18 inches deep; lay perforated "Big-O" pipe on 6–8 inches of stone.
2. Wrap pipe in landscape fabric; slope 1–2 inches per 10 ft.
3. If no outlet, build a dry well (3×3×2–3 ft, fabric-lined, large stone, wrapped, covered with 12+ inches soil).
4. Keep 8–12 inches soil over pipe to avoid yellowing.

Grass Selection & Timing

• Cool-season (fescue, KBG): Seed late spring or early fall (fall best).
• Warm-season (Bermuda, St. Augustine, Bahia): Plug/sod early summer. Never fall.
• Match existing grass type.

Seasonal Tasks

• Fertilize late spring, early fall, late fall. Skip summer.
• Mow high (2.5–3.5"), mulch clippings.
• Water deeply, infrequently (weekly 2 hrs).
• Aerate fall.

Fix drainage first—no grass thrives in standing water.