There are a total of 4 Star Plants in the world. Locate energy rocks around them and connect the growing plants to them. Find the growing plants that are the closest to the targeted energy rocks and use them to connect these energy rocks to the Star Plant. Each energy rock will allow the Star Plant to grow by some amount. The game will show you how many the Star Plant has to connect with. If you almost reach an energy rock near the end of the growth period of your plant, you may be able to reach it using the last slow portion of the growth. If you don't reach an energy rock on your current attempt, you can use the new growing plants on the sides of the one you just grew, or use a now accessible one near your new area which can reach the targeted energy rock easily. One of the Star Plants is in the purplish biome with lots of Champolines. Use this one to reach the first part of M.O.M. Another one is in the Desert Biome. Vineland has a third Star Plant, which begins off the ground on top of a huge mountain. When you're ascending to the Moon, you'll have to climb a series of rocks up until you reach a floating island with an air blasting volcano. Use this to reach another series of rocks and climb those. Then, use more floating, thrusting and launching plants to reach a huge island. This has a Star Plant on it, which doesn't require any energy rocks. Grab onto the white sphere at the tip and activate it. It will enclose you with its petals and grow towards a crater with the parts of M.O.M in it. This is needed to reach the Moon. Once you've flowered all of the Star Plants, you'll unlock the achievement.