From Perplexity on 9/22/2026 after confirming the grass that lived through the cinch bugs and looks great is centipede. This post has advice about seeding and plugging. Today we ordered a pluging tool.
You have confirmed the alternating leaves along the stolon, you have centipedegrass. For your Mobile-area lawn, establish it from seed in late spring to early summer, after the soil is reliably warm—not this late in September.
Best timing in Mobile
Plan to seed roughly late April through June, with May usually the safest target in coastal south Alabama. Wait until:
- Night temperatures are reliably mild and the risk of a cold snap has passed.
- Soil temperature is consistently at least about 65–70°F.
- You can keep the seedbed evenly moist for several weeks.
- You have enough growing season remaining for seedlings to root and thicken before winter.
Centipede germination can take roughly three to four weeks, and it establishes much more slowly than Bermuda. Extension guidance recommends repairing bare spots in May or once temperatures are consistently warm, with frequent light watering until emergence.[content.ces.ncsu][pennington]
Avoid sowing in fall. Even if a few seeds sprout, young centipede plants in Mobile have too little time to establish reliable roots and stolons before winter dormancy.[seedworldusa]
Which seed to buy
My first choice would be certified TifBlair centipedegrass seed—not a cheap “centipede blend” of uncertain origin.
TifBlair is a named, seed-propagated improved centipede cultivar developed in Georgia. It is generally selected for better cold tolerance, fall color retention, and performance in acidic soils—good traits for your Gulf Coast site, even though your winters are milder than north Alabama’s. It can establish from seed, unlike many improved centipede selections that must be propagated vegetatively.[solutions.tennessee][georgiacultivars]
When buying:
- Look for a label that says “TifBlair centipedegrass” and preferably certified seed.
- Check the test date, germination percentage, weed-seed content, and percent pure live seed.
- Avoid bags labeled mainly as “contractor mix,” “southern lawn mix,” or a generic mixture unless the seed label specifically identifies the centipede cultivar and purity.
- Buy a little extra for patch repair rather than trying to stretch too little seed over a large area.
There is no need to replace the existing healthy centipede patch with TifBlair. A slightly different centipede type will normally blend acceptably over time. Use the seed on the open areas created by lost St. Augustine.
Do not seed into dead sod
No—do not simply throw seed into intact dead St. Augustine sod. Most seed will lodge in the old thatch, where it dries out, fails to make soil contact, or germinates weakly and dies. The dead sod may look thin from above while still being a thick, matted barrier at ground level.
Your goal is seed placed on loose, exposed mineral soil, then pressed gently into it. Extension recommendations similarly call for clearing dead grass/debris, raking or tilling to prepare a smooth seedbed, then lightly raking seed in for soil contact.[lsuagcenter][info.supersod]
Best patch-repair method
Do this when you seed in May:
- Kill or remove remaining live St. Augustine and weeds in the areas you are converting. Do not apply a pre-emergent herbicide before or after seeding; it will interfere with germination.
- Scalp and bag the dead St. Augustine. Set the mower low, mow it down, and remove the clippings. Repeat if necessary.
- Rake out the old thatch and runners. A steel garden rake, dethatching rake, or small power rake works. In a small patch, scrape with a flat shovel or grub hoe until you can plainly see soil.
- Loosen the top ¼–½ inch of soil. Rake it so the surface is level, friable, and not fluffy. Do not bury seed deeply.
- Seed at the bag’s renovation/patch rate. For a typical centipede repair, Extension guidance gives about ¼–½ pound per 1,000 square feet; for small bare patches, use the label rate and distribute it very evenly. Mixing the tiny seed with dry, clean sand makes it much easier to see and spread uniformly.[content.ces.ncsu][hgic.clemson]
- Lightly rake or roll. Cover no more than about ?–¼ inch, or simply press the seed firmly into the prepared surface with a lawn roller, the back of a rake, or careful foot pressure on a board.
- Water lightly and frequently. Keep the top half-inch moist—not muddy and not puddled—until germination and early establishment. In warm, dry weather that may require several short irrigation cycles a day. Once seedlings are established, gradually shift to deeper, less frequent watering.[content.ces.ncsu][hgic.clemson]
- Mow only after seedlings have rooted and reached mowing height. Use a sharp blade and remove no more than one-third of their height. Keep centipede roughly 1½–2 inches tall in the growing season.
Important soil and fertilizer point
Because centipede is sensitive to excess fertilizer and higher pH, get an Alabama Extension soil test before fertilizing or liming a sizable conversion area. Do not lime simply because it is common lawn practice; centipede generally prefers acidic soil, approximately pH 5–6, and can decline if the pH is pushed too high. It also dislikes excessive nitrogen and phosphorus.[content.ces.ncsu][solutions.tennessee]
If a soil test is not practical for a few small patches, use fertilizer sparingly and follow the seed product label—do not apply a heavy St. Augustine-style feeding program.
Consider plugs as an alternative
For isolated holes, plugs from the healthy centipede already growing in your yard may actually be the simplest and most genetically consistent repair method:
- In May or June, cut 2–4 inch plugs from vigorous spots.
- Set them into fully prepared bare soil at about 12–18 inch spacing.
- Water them in and keep them moist until the runners begin to move.
That avoids the cost and slow germination of seed, and it ensures that the repaired area matches the centipede already proven to thrive on your particular property. Seed makes more sense for broad areas; plugs are excellent for smaller chinch-bug-damaged patches.
