I have yet to get 100 crystals (at about 72%) so I found an easier way to do this:
Take the Meep from the very bottom by teleporter 2, drag him to it, then teleport to 7 (holding onto Meep until you feed it to plant, letting go right before you jump out of the plant's trap).
If you go to the edge just to the right of the leaf glider, there are two platforms below. The first platform has a small and a large snapdragon plant* on it. Even lower than that is another platform with a snapdragon plant that has a jewel in it. FYI, the trophy 🏆 only popped for me when I fed him to the plant with the jewel.
*Seed 🌱 location, possibly why the trophy 🏆 was voided for me the first time, I fed it to the large one with the seed in it, while attempting to grab the seed 🌱 (don't knock it off like I did, I'll probably never find it).