Seeding & overseeding

The first seeding question isn't when — it's whether. A lot of our lawns can't be grown from seed at all, and starting there saves a wasted bag.

First things first

Can it even be seeded?

Some warm-season grasses grow readily from seed; others make no viable seed and must be laid as sod, plugged, or sprigged.[AgriLife Establishment, AgriLife Selection]

Grows from seed

Common Bermudagrass — the reliable, fast one.
Buffalograss — a fit for lower-water lawns.
Zoysia — only a couple of seeded types, and slow to fill in.

Sod, plugs, or sprigs only

St. Augustine — no viable seed at all.
Hybrid / improved Bermudas — vegetative only.
Improved buffalo & zoysia varieties — sod or plugs.

So if you've got St. Augustine— common here — seeding isn't on the table; it's sod or plugs.[AgriLife Selection]

If you can seed it

Warm soil, late spring.

Warm-season seed germinates best when the soil is warm — about 70–95°F — which lands in late spring to early summer here. That gives the grass a full season to establish before things cool off. Fall seeding is for cool-season grasses, not ours.[AgriLife Establishment]

It's soil temperature, not the calendar, that matters — a cool spring pushes the window later.

Roughly how much seed

Per 1,000 sq ft.

0.5–1 lb

Common Bermudagrass.

2–3 lb

Buffalograss.

1 lb

Zoysia (seeded types).

Rates for seeding a new stand on bare, prepared soil.[AgriLife Establishment]

A firm, clean seedbed

Loosen and level a weed-free bed, roll it firm, then rake lightly so seed catches. Broadcast half one direction and half across it, then roll again for good seed-to-soil contact. One warm-season quirk: don't mulch the seed — heavy mulch blocks the sunlight bermuda and buffalo need to sprout.[AgriLife Establishment]

Then keep it moist

New seed can't dry out, even briefly. Keep the surface consistently moist — not soggy — with light, frequent watering, sometimes four or five short cycles on a hot, windy day, easing off after a couple of weeks as it fills in. Figure roughly 60 days to full cover, and about a year before it's truly established.[AgriLife Establishment]

Overseeding for winter color

Some people overseed bermuda with ryegrass in the fall — about 5 to 8 weeks before the first frost, at 5–10 lb per 1,000 sq ft — for green through the winter. It's optional, and there's a catch: a cool, slow spring transition can leave the underlying bermuda thin and weak when the ryegrass finally fades.[AgriLife Establishment, AgriLife Selection]

Not sure what your lawn needs?

Sources

1.Chalmers, D. & McAfee, J. "Turfgrass Establishment for Texas" (B-6239 / SCS-2009-06). Texas A&M AgriLife Extension. Link
2.Chalmers, D. & McAfee, J. "Turfgrass Selection for Texas" (SCS-2009-05). Texas A&M AgriLife Extension. Link

General guidance drawn from Texas A&M AgriLife Extension — a starting point, not a prescription. What (and whether) to seed depends on your grass and your soil.