The mechanic of Tetris shaped blocks and trying to align not the rows but instead the all three colors was a clever twist, though I wish there was visual of some sort showing what combinations were eligible for the plants to grow. This is probably just me but I took the "sister plants" as crops of the same color.
If you ever continue this I would suggest having the crops that do grow disappear or get harvested and like Puyo Puyo or Dr. Mario fashion have the crops above start to fall. I think it would allow for more complexity and replay-ability.