Calla lily in pots
Each pot has 4 plants, now in third season. I get one flower only, then loads of leaves. Now still growing leaves, looks great and healthy. Well watered and in partial shade.Been the same each year, now third year. Left out all year round. I would like more flowers....
I would try adding some Phosphorous, you may have to much Nitrogen in the soil, as this causes lots of green leaves and little or no flowering.
Bone Meal is a good way to do this.
Here are a link to refresh you on care requirements.