Can't bonemeal saplings

[ayylmoa]

Maples, darkwood, hopseed, and redwoods can not be bonemealed. Maples also spawn with a sunflower instead of the wood itself sometimes.

[nikii-me]

Let me explain this:

Maples can only grow above Y 65 level. Darkwood can only grow on netherrack, soulsand or tainted soil. Redwood needs 49 saplings to grow, in 7x7 square.

Not sure about Hopseeds or the sunflower thing though.

[TheDeviantCrafter]

The maple sapling requirement doesn't seem to be mentioned anywhere aside from this obscure forum post. Can you add tooltips to the saplings explaining their growth requirements?