I have a calla lily bulb and I'm wondering how I should plant it since I'm going to use a container and the fact that it's late summer. I read about letting the plant go dormant for a few months. I'll appreciate any information you can give me.
They normally go into dormancy in the winter. However, ones that are in containers can be forced into dormancy anytime. Stop watering the plant and place it in a cool, dark place for at least 2 months. Then bring it out and start to care for it. It should bloom in 1-2 months after this. They may need more water and light to avoid going into dormancy, or you can just let them go and then enjoy another round of blooms indoors later in the year. This article will help: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/make-calla-lily-bloom.htm
I have heard from friends that plant leaves turn yellow as a result of too much water. The rule was yellow leaves, too much water. . . brown leaves, not enough water. I have experienced this in other plants. I transplanted mine in a container and watered it once. It was droopy Saturday. Now sunday morning it is upright but my two bottom leaves are yellow. One site said to water it once a week. Other sites say water often. My soil is from a bag of black manure. It holds moisture very well. My container is small, maybe 2 gallons. How often should I water it? I was going to do every 4 days.
Really you should be watering by touch rather than by time. Calas like moist soil, so when the top of the soil starts to feel that it is drying out, you should water it.
What it sounds like though is that your plant has transplant shock. This article will help:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm
As to yellow leaves meaning overwatered, this is not true. It can indicate both that the plant is overwatered or underwatered as well as that the plant may not be getting enough light.
Had a calla lily as a present that advises watering twice a week and no feeding. I had it for just over a week and the leaves and flowers are rotting where they enter the soil. What am I doing wrong?
It is likely not something you have done is this is happening after only a week. It was something that happened before you got it. It sounds like it has crown or root rot. Both are caused by overwatering and would not happen in just a week. Here is information on root rot to help you with it:
https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm
I planted my bulbs in pots (outdoors in a sunny location). They were very green, but never bloomed. Now the leaves are beginning to turn yellow.
It's possible that they could either be overwatered or missing nutrients. Have the soil tested to fix any possible nutrient issues. In the meantime, you could try adding some phosphorus to the soil to help promote blooming.
I live in Nebraska, so it gets very cold. How do I winter Hydrangeas and Calla Lilies so they will be ready for next spring?
These articles will help you:
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-winter-care-how-to-protect-hydrangeas-from-winter-cold-and-wind.htm
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-lily-winter-care.htm
I have 2 calla lily container plants. They have both flowered and been pollinated. The resulting bulbs(?) are now drooping. How can I get these to produce additional plants?
This article will help you:
http://www.callalilyguide.com/growing_calla_lilies.html
How do I know that my calla lily is done growing for the year? After all the blooms are gone, can I cut the leaves off my calla lily? Why does it look like a seed pod growing in my bloom after it has bloomed for a while and the weight of it causes my flowers to bend?
Once the blooms have all faded and are replaced with seed pods, then the plants are normally done for the season. You can cut the spent blooms right after flowering, unless you want to save the seeds. Since the seed pods naturally weigh down the stems, they will bend over to the ground. Cutting the spent blooms or seed pods will prevent this.