What should I do if the leaves start turning yellow?
If this happens to your Wave Petunia plants, it may be a sign the plant needs more fertilizer. A regular application of a soluble fertilizer every 10 to 14 days is recommended. Applying a slow-release fertilizer when you plant is also beneficial, although it may be depleted by late Summer. The use of a soluble fertilizer throughout the growing season is recommended, even if slow-release has been used.