That is a good looking stand you have there. I plant a fair bit of both aeschynomene and Alyce clover in SC and it does very well provided it can get some moisture early on to get established. While I get a good bit of volunteer growth the following year, it is never thick enough to be a self-sufficient stand. I end up going in during April and either drilling or broadcasting seed just ahead of a rain shower. It does indeed love some phosphorus fertilizer.