I purchased a colocasia illustris from a local garden center here in south central PA 2 months ago and it isn't dying it just seems to be growing at a very, very slow rate. Heck if I didn't measure it I'd think it hasn't done much at all. It's leaves look fine and there is no apparent problems. I have it now in my pond stream about 1 inch of water for the past month and still no real growth. I thought these were fast growers, maybe I'm being impatient. I would love any suggestions to boost this little guy along. I have recently put up a greenhouse, yet to be used, would this be a place to start. We have have high humidity here as a norm but maybe the GH would help it alomg. Thanks for any help.