Having trouble with calla lilies dying out. can’t keep them going

Question

some yellowing, tips of some have turned brown and withered

Answer 1

Yellowing indicates a problem with the roots, such as overwatering or poor drainage, which can cause root rot, or a nutrient deficiency in the soil. Have your soil tested to see what is missing. Your local cooperative extension service can do those.

Also, consider moving your lilies to a site with better drainage. Calla lilies prefer moist soil, but not soggy or sitting in a puddle.

Here is more information:

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/yellow-calla-lily-leaves.htm