But I'm experimenting mostly, so I put this little sprout in a bottle filled with ordinary tap water and a couple house plant spikes, and put it on a sunny windowsill. Sure enough, it continued growing. Which answers once and for all that you can't ever overwater Elephant Ears, they will grow in just water with no soil. The one in the photo was been in that bottle on the windowsill for about a month and all of the leaves you see are new since it's been in the bottle.
So this morning I am beginning the process of adapting it to be outdoors, called *hardening off*. If I moved it outside and just left it there, it wouldn't like it, it's still too cold outside, especially at night. So the trick is to move it out into the sun for a while, then back to the windowsill and night, and so on for a week or so until it's ready to live outside.
I think I'll go out and wander around and ponder where this one could be planted - if there's room in the garden.