You can store them like other off season tender bulbs and tubers. Allow them to die back, trim off the dead foliage and store in a cardboard box wrapped in lots of newspaper(lots of air pockets for insulation), store box in a cool, dry area. Or you can cut them back, allow the pot and soil to dry out and store them in the pot against a cool dry wall in a basement or garage. Don't let them freeze or get too warm. You can take them out to repot and get warm a few weeks before time to put them out in the pond. Check the bulbs for damage before and after storage. Don't use plastic. They need to breathe. Temps can be between 40-55.

Or, you can pot them up, if not conveniently potted already, and take them in the house for winter greenery. I usually have impatiens growing with the EE's and they grow well inside as well.

Thanks for the suggestions guys :)

Watch for spider mites in the greenhouse. Mine always get them....I heat mine though.

Good idea...ALL the plants get sprayed real good before they go in the greenhouse for the winter :)

Colocasia "Black Magic" is known to be very tricky to overwinter. I've tried the common ways with no success. It doesn't grow a bulb - more like a thick knot at the top of the roots.

Since I have one (again) that I'm going to overwinter, I've been researching other methods. The attached post is written by a guy active on many GW forums. I'm going to use his water in a bucket method.

Gail

Here is a link that might be useful: Overwintering info lower in this thread

Not sure my black elephant ears are "Black Magic" as my husband planted them several years ago but we do have them on a little knoll that is between our eddy and the creek. Even though it stays cooler down there even in summer, we don't mulch them heavily in the fall and (knock on wood), they have come back every year without our digging them up. They have even spread there and some come up in the creek and we leave them.