Further to the world-breaking rubber sapling, there are two others which are quite large as well. On my SSP, I planted a sacred rubber sapling thinking I would be okay since it wasn't shimmering. I was watering it with the watering can and boom....suffocated in a wall. I spawned on top of a very large rubber tree...I believe I was around Y=160. Not world-breaking...not too much lag, but still massive. I set up an MFR harvester and after two double-chests full of wood and rubber each, it's finally reaching the leaves. I'm cool with it...will have dirt for days now.