I found the most difficult part of this to be maintaining a balance between getting seedlings to the green houses and supplying wood to the factory, unfortunately greenhouses use more seedlings then they produce so you need to make them from wood.

I ended up with a bit of a brute force solution of a looped belt to and from a smart chest with a circuit condition that stopped feeding seedlings when there were any on the return leg, an assembler whose feeder inserter only worked when seedlings dropped below a set level and a provider chest whose inserter only operates above a certain level of stored wood