If you have followed the steps above then you can expect to harvest your first AeroGarden strawberry 3 weeks after you see the first of the flowers form. Homegrown strawberries can be a bit smaller than your conventionally grown supermarket berries. So, don’t be disappointed when the end result is closer to the size of a raspberry. What these home-grown strawberries lack in size they make up for in flavor. So, wait until the white part of the strawberry has completely changed to red for the best flavor results.