It would be great to track where seeds come from.

At its simplest this could be a select dropdown on the seed form:

• seed catalogue
• retail outlet (online or bricks and mortar -- might be 2 different ones? not sure)
• seed bank or similar institution
• traded from another person
• my own seed saving
• other/unknown

Stage 2 would be to actually track which seed catalogue, retail outlet, seed bank, etc, or who you traded from (this should probably be a second story).

See also #605 (seed trading) -- if you trade seed with someone via Growstuff, it could automatically add the seed to your stash and mark it as from that person.