Answer: Lack of sufficient sunshine or over-fertilization are about the only things that will keep verbena from blooming. Perhaps the one side of your plantings gets more sun than the other? Withhold fertilizer, water when the soil begins to dry and lightly prune them back to encourage new flowering stems. You can use garden shears or even hedge trimmers to cut the old flowering stems off the plants (or to encourage flowering stems on the non-flowering side). Good luck with your verbena!
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