Wave petunias are heavy feeders. Apply organic fertilizer every 2–4 weeks. If soil was well‑prepared, a liquid feed of hydrolyzed fish emulsion + seaweed extract works well. Yellow leaves signal nitrogen need — add a slow‑release organic fertilizer.
Note: organic fertilizers release slower than synthetics; growth may be slightly less explosive but more sustainable.
Search for liquid fish fertilizer at shopping.com.
— Mack Jean, Master Gardener, Tennessee
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