I have started lettuce, kale, cauliflower, several varieties of tomatoes, sunflowers, collards, petunias, stock with great success. The sunflowers do amazing, less than a week and I have a nice sized seedling, I could start a sunflower farm with this thing lol
The things that failed... peas (with the exception of 2 plants that made it) and moonflowers. The reason being is this thing is not made for huge seeds. I tried by cutting the sponge hole wider and poking them down in there but there is simply not enough air flow for large seeds and they rot.
1000% worth it. Makes my Aerogarden more fun than it already was