yeah, they do. all plants like more nitrogen, except for beans (they make their own...kind of)
when something is "full of nitrogen", that means it hasn't broken down yet. very different than nitrogen in fertilizer. say you use only kitchen waste to mulch your plants...best case scenario, as its breaking down it uses all available nitrogen to fuel the conversion, leaving your plant with none. worst case scenario is two options. 1:an animal comes and neats it all, digging and destroying your plant during the process, and 2:as its breaking down it gets too hot and frys your plant. using green grass as mulch right up against a stem will heat up way too much.
i realize you weren't going to do this anyway, just thought you might be interested.
when making home compost, the ration is 80% carbon (brown,dry stuff) to 20%nitrogen (kitchen stuff, or stuff not dry)
there truly is an art to making good compost, but that's for another forum. the forum is called "$#it happens". ha