beautiful healthy calla lilies have fallen

Question

Two separate patches, 40 sq feet and 60 sq feet. Each are protected by a 2 story structure and each get only very early morning fun. Last year the larger of the two suddenly just laid down. The luscious green stalks were easily 4 feet high and producing constant blooms, appeared ever so healthy. I cut back those that could not stand and eventually the garden came back. This year the second garden duplicated the same behavior. “What in the world”?

Answer 1

This article offers a few insights: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/drooping-calla-lilies.htm