This is super appealing concept for a game, and the execution is impressive! I like the stem mechanic; it feels very natural and smooth. (I kept getting too close to the top of the screen, and then I realized that I had to slow down the growth by moving sideways!) I wasn't sure what all the icons represented, so it required some trial-and-error to figure out what was harmful and what wasn't. Also the icons on the Garden screen were somewhat unclear to me; I didn't understand the benefit of clicking the hand and the bag of money.
I was very impressed by the depth of the game, including the buffs and the number of different plants to collect. I wasn't sure if I could intentionally grow specific flowers by collecting specific nutrients. That could be interesting, but it was also nice to be surprised by the results! Overall, very well done!