Answer: Some verbena species are worse than others about thinning out in the center as they spread outward. Verbena usually responds well to a good shearing and will reward you with fresh new growth and bloom in weeks to come. Late winter is a good time to do this. You can also give it a light shearing after a bloom cycle fades to promote more growth and bloom.
Verbena can be propagated by following standard recommendations for stem cuttings. A simpler idea that works great is to bend a stem enough to cause it to break over but not break off. Then bury that section an inch or two deep in the soil and water well. The stem will root at the broken spot and can later be severed from the "mother plant" and transplanted.
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