 Get 60% off today at privacykim.com. You may have a green thumb, but you don't know what kind of plants you can grow or when to plant them. I have a few apps to help. Planta is a favorite. Not sure how much your plants need to be watered? The app will send notifications to remind you. Nice. It also has a built-in light meter to tell you if your plant is suitable for your home based on lighting conditions. Now, what if your plant is looking sickly?