Okay I am worried about my hardy hibiscus. I have several planted around my yard and all are doing well except one. It had 4 buds on it about 3 days and today they are all brown and dried up. Also the plant has brown spots on the the stems and the other leaves just don't look happy.

I spayed with a general fungicide this evening and hope that works.

Any thoughts???

Dropping buds isn't a big deal but it usually means it's suffering from the heat. How hot is it where you are? Despite their reputation as heat lovers, they really don't like temperatures above 90s.

How old/new are they? They do like a lot of water when they're first planted.

They aren't usually bothered by fungus except perhaps in very wet weather. It would be helpful to post a picture if you can of the brownish spots.

P.S. Here's some info from the U of Florida:

Premature flower bud drop is often a problem with hibiscus. Some varieties, especially some doubles, are characterized by premature bud drop. Some varieties bloom well during one period of the year and consistently drop their buds at other times. The importance of variety selection is illustrated by this point.

Bud drop can be caused by insects such as thrips or caterpillars. Nematodes, nutritional deficiencies, overfertilization, and environmental factors such as poor drainage and excessive water, drought, or salt spray can cause flower buds to drop.

Su talking: I find the typical rosa sinensis varieties to be very prone to insects, so that would also be something to check for.

In southern CA, hibiscus collects the giant ash whitefly. Horrible. Plus it needs a great deal of water. Maybe there's a native Texas flowering shrub that would be happier with the conditions where you are.