This is such a cool concept and neat style! I think the game has a lot of potential. Maybe reduce the complexity - at least at the very start. Have the player start with a totally empty lot, and then play cards to plant the seeds and do the watering. Making the player build the garden from scratch would give them more of a connection to the garden, and also have them enjoy slowly discovering all the nice plant pixel art as the plants grow.
Top notch design of the ui, background, cards and plants.