That is cool, and Stinging Nettle is supposed to be an excellent homeopathic medicinal plant, as you say, if you can get past the bugs hahaha!
Never knew that about the maple sap, that is totally cool too! Pancakes and maple syrup!
I have a blackberry bush in my back yard, and my avocado;
I had a walnut tree out in front, but every time we got a good load of walnuts, the squirrels were double teaming and running 8 of them and they would clean the tree each year just before they were ripe; got rid of the tree. (it was in a bad location anyways, but it did have some good walnuts on it.) Also too close proximity to neighbor's house to shoot them, they would run along her roofline and jump into the tree from there.