You could cover large sections that contain bluebonnet plants with an inverted airtight container and spray around the covered area with a broadleaf herbicide. This will kill the clover but not damage the protected bluebonnets. It will kill any bluebonnet plants not covered, but eliminating the clover is worth the sacrifice. This spray will not damage your St. Augustine if you read and follow label instructions. You will have to remove by hand any clover that is growing among the bluebonnets because nothing will kill clover that will not also damage or kill bluebonnets. The sooner you do this, the less problem clover removal will be. Presence of clover is an indication of poor soil fertility. Take a soil sample to your local Extension office to be tested. Follow Extension recommendations for correcting fertility problems.

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