I am afraid that the short answer to your questions is, ”No!” An established clover crop within your existing groundcover is very difficult to control.   There are annual and perennial varieties of clover and control measures will depend on which type you have. You will find information on different tyes of clovers and control measures at http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7490.html

Pre-emergent weed killers like corn gluten will only work on preventing seed germination, and they must be applied at the correct time of year. . They will control annual clovers, but not perennial types.

Any broadleaf weed killer will kill your ground cover plants. You might try treating the young and actively growing clover with glyphosate. Spraying or misting will always produce overspray that will damage your groundcovers. However, if you put the glyphosate in an envelope dauber (the tube with a sponge tip used for licking envelopes), and then just brush the tops of the clover plants. You should get some measure of control without overspray.  

 If the clover is heavily established you will have to continue to treat indefinitely. Your best bet may be to pot up as many of the groundcover plants as you can then treat the whole area with glyphosate and then replant your potted groundcover plants after waiting a week. You might still have to use a pre-emergent herbicide if there are seeds left in the ground. If you do elect to apply any herbicide be sure to read the label carefully and follow all instructions.    

 For information on the Chester County Master Gardener Hotline go to