Phragmites, what a great idea! I'm off to cut down a bunch this afternoon while erranding - here too, it is wildly invasive in our river valley and removal is an ongoing struggle.
What other listed invasive exotics can be bunny food? Not only do they grow for free, but you are actually encouraged to remove them from public lands! Be responsible of course - never spread these species or plant them deliberately. If you pull or cut them for feed, be sure you don't dribble seeds or rootable bits as you go.
Let's make a list (mine will be those rampant on the East coast of the US, feel free to add others for your locale):
Kudzu, of course (Pueraria montana) doesn't grow where I am, but is high protein
Common Reed (Phragmites australis)
Japanese knotweed (Fallopia japonica) so far I've only fed the young shoots and they are devoured
garlic mustard (Alliaria petiolata) stays green most of the winter in a basal rosette and eaten more readily then, less favored when coarse and flowering
multiflora rose (Rosa japonica) bun doesn't mind the thorns!
greater celandine (Chelidonium majus) freaky orange sap
Japanese honeysuckle (Lonicera japonica)
barberry (Berberis thunbergii or vulgaris)
Oriental bittersweet (Celastrus orbiculatus)
