Why Your Verbena Isn't Blooming: Phosphorus Deficiency Solution

Healthy, non-blooming verbena in a hanging basket typically lacks phosphorus, the nutrient essential for flowering. Apply a water-soluble fertilizer high in phosphorus and low in nitrogen—such as Miracle-Gro Bloom Booster—every 10 days during the growing season.

Also, deadhead spent flowers regularly to encourage continuous blooming.