Dimensions for automatic tree farm?

Moin Leudeee,

I would like to set up an automatic tree farm in my basement in Minecraft and would like to know how wide it can be?

What space do I have to plan for this?

It greets

something confused

How wide can it get?

As wide as you want, actually.

What space do I have to plan for this?

For a cactus 5x5. For 4 cacti 7x7 etc.

I would take 9x9 cacti and then build several levels.

I don't want to build a cactus farm, a tree farm with these new nether trees

Your question says:

I want to put an automatic cactus farm in my basement in Minecraft

Lol, the title says Baumfarm xD