Wow. This feels incredibly polished for a one week game jam submission. The quality of the visuals especially stands out, and the card pictures and descriptions are cute.
Probably the most relaxing game I've played in quite a while, with a fun puzzle mechanic. The game is easy to understand, and feels like something might play as a co-op experience on a board game night with friends.
If this were to become a full game it might be fun to think about introducing new gameplay aspects or unique properties of plants to keep the gameplay loop refreshing for new levels/plants. (but that's all just based on my first impression and immediate thoughts)