It sounds win-win to me. You don't have to advertise that you sell plants, so I'll be overall, it'll work out well (just my opinion).

I started working with local printers of signs and shirts. If I get a customer wanting shirts or large quantity signs, I tax on a small fee for myself, but resell the local guy's stuff. We've become good friends. The shirt guys have a shelve with about 100 of my products in their display room. The sign guy has turned over small silk screened products over to us (decals, bumper stickers, refridgerator magnets). All because we get along. So my gut is telling me you've made a positive move. GOOD LUCK!