Petunia, pelargonium has light leaves, does not bloom and develop well? This is a signal that plants need feeding and correction of soil indicators.
How to feed flowers to get a lush bush, a large flower and bright green leaves?
Fertilizer solutions have different pH values! Some macro and microelements affect soil acidity: some acidify, others alkalize.
Before applying fertilizers for pelargonium and petunia, carefully study its composition!