Calibrachoa

Question

I purchased numerous calibrachoa pot fillers (2 inch) and they are not flowering. The plants appear healthy but no blooms. For my pots I use half composting soil and half potting soil. Is there something wrong with my composting soil?

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Answer 1

It could be excess nitrogen, which inhibits flowering.

https://www.gardeningknowhow.com/ornamental/flowers/million-bells/calibrachoa-million-bells.htm

Use a balanced fertilizer, and try an application of Bone Meal as phosphorous will help boost flowering.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm