My book says spring or autumn.

ok thats good bamboo, will wait till leaves turn then thankyou ;o))

Oh Man! If you already put a question to the forum, then you have the names already write properly! The correct name of the plant is: DARMERA
PELDATA !! ?

Actually its not, Netterklaus, its Darmera peltata with a t in the middle, not a d - and spelling mistakes and typos occur, clearly, since you just made one yourself, but so long as we know what people mean, we don't worry about it too much, and you shouldn't either, even though you made one yourself....