My little bog with huge plants is awaking.
1) One of the more conspicuous ones is Lysichiton americanum. I have different clones. The best clone produce the yellow spathe much earlier than the other and with less ordinary leaves. Two clones mean enormous seed production and idem seedlings (2).
The Asian equivalent, L. camtchatensis, is a little later and smaller and with white spathe (in the middle not blooming yet (1)).
3) I thought I planted Caltha leptosepala but I think it is Caltha palustris alba. Anybody who knows the difference?