Q.Calla Lilies And Hardiness Zones
I live in zone 7b. I planted Calla Lilies in spring of 2015. 2 of the 3 planted that survived the first winter are huge and I want to divide them. How many rhizomes can / should I remove? Is it safe to leave the divided rhizomes implanted for 1 week before replanting?

Certified GKH Gardening Expert
I would not divide after the first winter. There will, only, be a few offsets. I would wait 2 or 3 years.
Should you still want to attempt this task, this early, here is an article that will help:
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/dividing-calla-lilies.htm