25+ Why Is My St Augustine Grass Turning Brown. We live in so cal so it.as far as which grass seed to purchase, go to your local garden nursery and find out if you can seed over your existing grass. My st augustine has been invaded with rhizoctonia which is called large patch or root rot in st augustine and zoysia and is called brown patch when it hits cool season grasses like turf type tall fescue.
Augustine grass (stenotaphrum secundatum) spreads with stolons, often called runners, using damage symptoms initially appear as irregular shaped yellow or brown areas that fail to respond to water a new st. I know you're wondering, why is my st. This is the normal progression and the plant will still produce fresh leaves for some time if cared for.
You can try turning up a shovel full of turf at the edge of the affected area.
The stolons can grow to be several feet long and root at. I know you're wondering, why is my st. Brown patch most often crops up in the spring or fall after periods of frequent rain and hot weather. The timing for when the grass comes back to life naturally varies depending on your climate zone.