For those of us not in the tropics, overwintering EE can be quite a burden. Especially if your plants are taller or wider than you or if your collection has grown out of control.
I would be interested in knowing which EE have overwintered the best for you and your techniques.
Here are my experiences (Sone 6a, overwintering Late Oct. through mid May):
Fontanesii, Ruffles and Big Dipper will overwinter:
(a) in a garage in a pot if you water very sparingly.
(b) as bare roots and storing in peat with very limited watering - maybe misting 2x per winter has worked but dessication can be a problem.
(c) in pots in a room with supplemental light (14 hr light cycle) at std house temps or slightly warmer but aphids and spider mites are problemmatic.
Other colocasia -including several hawaiian forms I can only overwinter as (c).
Gageana is by far the easiest with good results using (a), (b) or (c).
Macrorrhiza and odora are also fairly easy using (a), (b) or (c) but is more susceptible to root rot.
Wentii seems happiest with (c).
Cucullata seems happiest with (c) but is very susceptible to mealy bugs
Lutea, plumbea, aurora, hilo beauty and ridleyii seem to resent overwinter and barely hang on with (c).
Caderii seems happier overwintering as a house plant than being outside.
Violacea, Robusta seems to do fine with (a) or (c).
Lime Zinger and Mickey Mouse seem to resent overwinter and barely hang on with (c).