Q.Why Are My Calla Lilie Green Stalks Much Taller Than Their Bloom?
Green leafy stalks are taller than the blooms and then you can’t see the beautiful blooms.
Certified GKH Gardening Expert
Your foliage may be stretching toward the light. Try giving it more light and if it is indoors, turn the container a 1/4 turn each week to balance it.
Also, be sure it isn't getting too much nitrogen, which will accelerate leafy growth.
Don't be discouraged, though. I've noticed that same thing in many of them.