Answer: Dee Dee,
You can do one of two things. If the tall stalks are bloom stalks you may want to provide support at least until they are done blooming. A mesh type wire suspended about 8-10 inches above the ground on stakes or bent into a "C" shape can provide the needed support. If the growth is not bloom stalks it is fine to shear it back, but if it flops that won't hurt the plant, it's just not that attractive.
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