Named garden forms of Ranunculus ficaria?
Does anyone here have actual experience with the many garden cultivars of Ranunculus ficaria like 'Brazen Hussy', 'Collarette', 'Copper Knob', etc. I am always on the lookout for new (to me) spring ephemerals. In addition to pretty blooms many of these also have foliage that can rival a cyclamen.
The straight non-selected species Ranunculus ficaria can be a truly nasty, invasive weed and I would never knowingly plant it. The selected forms are supposedly non-spreading and only slowly clumping.
Can anyone tell me more about these? Weeds or potential treasures?