I live in Canada, so dug it the bulbs in fall. I had them in the garage in an open plastic pail. I forgot about them until today. It has been getting to -10 degrees Celsius at night but our garage is insulated. Will they survive if I wrap them in paper, place in plastic bags and store in a cool dry place?
Move them to a cool dry place that is about 50 degrees F.
Any colder and the bulbs will likely freeze.
Keep an eye on the bulbs to watch for any size of rot. If they are soft and mushy it would be best to dispose of them.
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-lily-winter-care.htm
Why is my Calla lily dying?
Your plant needs to have a dormant period to rejuvenate it's bulbs.
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/make-calla-lily-bloom.htm
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-lily-winter-care.htm
Does it help to break dormancy if I treat my callas with Gibberellic acid?
Gibberellic Acid is generally used in commercial growing applications.
This hormone product is generally used in seed germination or large scale productions.
There would not be any basis or reason to use this hormone treatment for your Calla Lily bulbs.
Received one for Father's funeral and would really like to keep it alive. Came with no information - is about 3 ft tall and probably already too much plant for the pot. Seems to wither down quickly in direct sunlight, leaves get floppy. (I live in central IL). Thank you for any help you can provide!
By nature a Calla Lily is an outdoor plant but can be grown indoors.
They need bright light, an East or West facing window is best.
Calla Lily are fussy about temperature and ideal temps are no warmer then 65 degrees F daytime and no colder then 50 degrees F night temperatures.
Soil should be moist but never soggy. Calla Lily will die from root rot if they sit in poorly draining soil.
No fertilizer should be needed.
Drooping leaves and stems can be due to water issues. Either too much or too little.
Here are some links to help give more care information.
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/calla-lily-winter-care.htm
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/drooping-calla-lilies.htm
Do I need to pull callas out of the ground for winter in New Jersey...or can they remain planted?
Calla Lily bulbs are hardy in zones 8 or higher.
In New Jersey you would need to lift the bulbs from the ground or place pots of lilies in a sheltered location for the winter.
Here is a link with more information.
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-lily-winter-care.htm
Grown indoors in pots - how safe for pets?
Calla lilies are poisonous to both cats and dogs.
For more information on calla lilies, please visit the following link:
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm
I planted some lilies in a pot a few years ago, and it seems to me that the soil level in the pot had gone down a few inches. I had planned to replace the soil over the winter, but never got around to it. The buds are now showing, so I don't know if it's safe to cover them with more soil, or even if it would have been OK to add soil over the winter. So, do I leave it alone or add soil?
I would wait until the lilies are done blooming they you can divide the plants if necessary and repot with fresh soil.