Crops can take some time to deliver their harvest, but you can use fertilizers to grow plants instantly.
To use Fertilizers, tap the garden bed with sowed seeds and drag the fertilizer over them.
Fertilizers can be obtained:
1. For completing special orders from Franco (in addition to crystal and booster)
2. From the Trader on the Daily Adventure (available after completing the Growling Grotto)
3. In a gift box for the 20th day in the game
4. By purchasing Basic, Super and Huge Packs in the Bank