I don't know how to post live youtube videos here... But check this out. I got some "tubers" from Aquatic Biologists and now that the plants are grown, deer are hammering it. https://www.youtube.com/watch?v=gJ-g11xSuzM&feature=youtu.be
I don't believe Arrowhead is an invasive plant. arrowhead: Sagittaria sagittifolia (Alismatales: Alismataceae): Invasive Plant Atlas of the United States
interesting idea. I don't know about elsewhere, but that arrowhead stuff is all over the midwest. I know I've seen it several times; never knew it was browse for deer or even edible for humans. quick wiki: Sagittaria - Wikipedia, the free encyclopedia looks like several species are native to the US. Just because it's not native to your particular pond doesn't mean it's invasive.
It needs sun... Not sure how much but I don't think it would do well in a forest. It also needs muck. You buy tubors (similar to planting onions ) you just reach under the water and stick them in the muck... Not sure where the "invasive species" stuff came from, but pretty sure this is a native strain. The Biologists I got it from are pretty hard core against invasive species and they plant the stuff everywhere.
Dan here in Minnesota the DNR considers Arrowhead a water garden pond plant and does not allow transplanting in natural occurring wetlands, heck they do not allow potted waterlilies to be wintered over in ponds and wetlands. I should have been more clear about where I was coming from, Minnesota state law vs other states.
how much did you plant? I thought I heard you in the video say it has spread all around the pond. it looks like it has a good conservation purpose on top of feeding the deer, helps prevent erosion of the pond sides, feeds the ducks and other bird too.