Answer: Such a dilemma! It's generally recommended that trailing verbena be cut back to remove the spent flowers and encourage additional blooms. By cutting back the plants you'll stop seed production, directing the plant's energy into new leaves and flowers. If you leave the plants alone, the flowers will develop seeds which will provide new plants, and possibly new flowers. So, the bottom line is: if you're happy with the performance and overall health of your plants, continue to cut them back as you have in the past. If not, leave them alone and see if they behave the way your neighbor's verbena behaves.
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