PF, what if the primrose gets established when the pond is low (it starts to grow below full pool line) and then the pond floods, or raises to full pool for a few months? Will enough of it float up so it continues to grow?
I have it established where it is a good 9-10 feet under the full water mark. The pond floods during Spring rains, it makes it to the top, usually within a month or less. It is rooted, unlike coontail. But will break apart and spred by fragment also. But unlike lilies it has no rhizome, not as much stored energy so it is a great grower. It will cover an entire shoreline, fast. When the water srops it stays green, my residents love that and the little yellow flowers instead of mud and dirt. But it does die back in my hardiness zone. Just about vanishes in the cold. It also will die back severely way up on the shore if it can't get water. But in my area, it is probably the number one marginal plant, with cattails.
