Answer: I wonder if your verbena is getting enough sunshine? They grow in full sun in the desert heat and bloom their heads off so air temperature and sunshine are important to them. There's not much you can do to make the air warmer, but you can make sure your plant is getting lots of sunshine. Even reflected heat will make a difference. So, think about some other places you might be able to plant your verbena. If you discover a sunnier, warmer spot in your garden, move your verbena there next spring. I think you'll see a big difference in its performance.
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