LRobi31070 wrote:

I live in OK and it doesnt keep over winter either. I dont have great luck
with it, but my friend down the highway does! Location, location, is right!

I have two preform ponds within ten feet of each other. WH thrives in one but
not the other. It thrives in the pond that gets a *little* morning shade. WH
does not thrive in a third preform that gets a lot more shade.

Zeuspaul