Phenology is good stuff, and addictive. Have you seen Project Budburst? They make it easy to track the cycle of plants online - and not just out in the country!

Also, there is software, available as shareware or purchased, from Life Cycles, for tracking stuff on your own computer.

(and now I have some catching up reading to do; I introduced myself but neglected to join or subscribe *facepalm* and so have missed everyone's posts for days. Hee! Such an airhead.)