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The great thing about these is that you can jump through them!
Wooden Platform is a tile which is solid on top, but passable when approached from anywhere else. You can jump through them, but unlike most games, you can't fall off them. If you place two Wooden Platforms next to each other, they will connect with each other creating a continous pattern.
To grow, plant a Wooden Platform Seed. (or splice a Wood Block Seed with a Grass Seed).