I personally like this idea it would make life a lot easier when it comes to gardening. Plus, making it togglable means that if users do not want to do the whole perfect watering then they don't need the notification. However, I am going to point out that The wiki has the times and I usually just set the Custom Notifications to alert me at that time. Knowing about the method above btw doesn't make me think that Perfect Berries/Nectar would be worth less. Many players still would rather buy them instead of grow them since it does take time and patience. Plus it is still part of chance to get them.