Calla lillies

[Tiffany M Cobb]

Hello..I need some help. In early spring I planted some yellow calla Lillie’s. They were already bloomed and looked wonderful. Now they are growing fine, the leaves look healthy and green. My problem is the actual flowers aren’t turning yellow. They are blooming but the flowers are green. I’ve read that I need to cut them back but I thought it may be to early to already cut them back. Also could I replant them in a pot and bring them inside and have as an indoor plant?