Do calla lilies come back every year once planted?
This really depends on where you live. The plants are not cold hardy and will not survive harsh winters in the ground. Therefore, if you live where temps fall below its hardiness (Zone 8 or higher), you'll have to dig up the plants and store them. This article will help: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-lily-winter-care.htm
Why do the leaves on my calla lilies not open (unfurl) and the plants look sick?
There are several reasons this could happen. The usual cause of this is that the plants are lacking the humidity they need, but there could also be root problems or root damage. Make sure they are getting enough water but that they are not in standing water. If possible, try to check the roots to make sure they are still firm and healthy.
How do I care for calla lilies?
This article should help with that: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm
I received a potted calla lily for Mother's Day. It was droopy when I received it. Is there anything I can do to make the stems stand straight?
A sunnier location will make a difference. If a plant doesn’t get enough of its required light, then it develops weak, elongated stem (legginess) that tend to flop over. Here is an article or tow that you may find helpful: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm, https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/drooping-calla-lilies.htm
I have a very beautiful calla lily plant which looks very healthy except that the flowers are not pure white but rather mainly green. The plant itself looks very lush and healthy but I am wondering what nutrient it is lacking to cause this problem.
Calla lilies' flowers normally start out green and will gain color as the flower ages. This is normal. Here is more info: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/green-calla-lily-blooms.htm
My gorgeous calla has been in blossom for 2-1/2 weeks. The flower stems are bending and the flowers are wilting. The plant is in the southern window (indoors). HELP!
Generally, potted calla lilies bloom 4-6 weeks, so this is unusual. Blooming may be delayed or shortened if not receiving adequate lighting. Also, you should give the plant a dormant period following the bloom time to encourage additional blooming. These articles will help: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm, https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/make-calla-lily-bloom.htm
How many flowers should an individual Calla Lily produce each season, and is 6 hours of sunlight a day enough for my Callas?
In general, the larger the calla lily tuber, the taller and more blooms you can expect. That said, fresh cut calla lily varieties will produce taller flowers but less blooms per calla lily tuber. The shorter potted calla lily varieties can produce as many as 20-25 blooms per premium-sized tuber.