Join Date: Jun 2011
Location: Twin Cities, USA
Utricularia has good fibrousy structure, but it will stay in a clump, not really grow along the bottom, as it needs to reach the surface to flower. Some of the fry may get eaten though, bladderworts are pretty cool carnivorous plants. otherwise, I would think water crowfoot; Ranunculus... I forget. if you have a sandy place i would think some Quillwort would work, or an Isoetes. But you'd have to wait for them to fill in. Best bet is probably the water crowfoot. No idea what zone you're in, but as long as you're not less than 4, these native ones should work.
A weed is a plant that has mastered every survival skill except for learning how to grow in rows. ~Doug Larson