Glad everyone likes it! My goal was to create a $2 cantrip with a small bonus, in the vein of Hamlet and Pearl Diver. I thought about naming it Florist, and still might, but to me Florist sounds like a modern store that sells flowers while Flower Seller sounds like someone selling flowers on the street.
I'm thinking $2 will probably work. At $3, I doubt it would frequently be chosen over Oasis, and to me seems pretty inferior. Since there would rarely be a reason to want to stockpile these (besides Gardens), I think $2 is probably reasonable.
As mentioned, beyond Gardens I could see this interacting well with Moneylender, Spice Merchant, and Counting House. It could also be a late game small boost if you have an extra buy, since the downside of an extra Copper won't hurt so much.
I think I might steal the spirit of it to help rework Brothel in my set. You mind?
That's fine, as long as it's not too similar, since I might eventually get around to putting together a set that might include this.