We have found that once a plant establishes, plants we grow from its seed do better than the original. I attribute this to epigenetic changes. We often have to baby plants at first. We have had pretty good luck with most pond plants. The exception has been eel grass which we have failed at keeping alive. Just transplanted a lotus from a pot into the new pond and put chicken wire around it until it spreads. I'll be moving some duck potato starts to this pond and a newish wetland as soon as they emerge a bit more in the oldest pond.
