I'm not sure this is quite what you're looking for, or even useful at all, especially at this point (I'm still working on it) but I've been working on a visual grid to keep track of all my plants, and what everything looks like.

It's extremely basic, a grid based on the key plants list with the name of everything, and pictures (with seeds) of what I have. I plan to get everything filled in eventually. It's also proven helpful in figuring out I had the seeds sitting around to make not just one, but TWO magic plants (I still need to compile the Fourpetal maple)

Enough babbling, here it is -

Bare Bones Plant Grid (http://www.iocane.net/plantgrid.html)

Quick note - I didn't start this until I hit soil level 3 (water level 2) so there are some 'early' plants that are under-represented.