The ability to “farm” plain-old-wood/lumber trees has been in for ages — it was one of the first features of the game.
Today I added the necessary content (all placeholder art — borrowed from other games/Google image search!) and adjusted the database so we could grow some materials: iron, copper, silicon and plastic — everything a robot-farmer needs to build additional robots! 🙂
Here’s my little test video (the planting was done via the DEBUG button):
The first thing you see is dirt with seed-items (planted), then they grow into saplings, then yearlings, then full-on trees. Again, that’s all placeholder art but, across the front(-right) row is: Plastic-tree, Sandawood, Copperwood, Ironwood.
 We may rename this the “Beach” tree. 😉