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[Crossroads Inc.]

So Ive got a large upstairs outdoors fort being constructed.. Currently most of the inner courtyard is just rocks and ryholite undernieth...

Now Id Like to have grass and trees inside... Can I simply make a pump next to the stream, flood the top part with water, have it go muddy... And will it then grow things? or will trees and grass only grow on "soil" ?

[LegoLord]

Grass only grows on soil or muddied soil.

[Footkerchief]

If the rocky areas are part of a mountain biome, nothing will grow there, even if it's muddy.

[Stravitch]

Talk to HeavyFlak, his community fort has grass now growing around his magma pipe .  Ask him how he fixed that up.

[zchris13]

Grass grows on sand also.

[Crossroads Inc.]

is it possible todig up soil and then put it over rocky ground?

Or to dig out a lay of rock floor and fill it with soil?

[zchris13]

The game doesn't work that way.

[Eagle]

If you have an underground pool/river, and you've found it, then towercaps and shrubs will grow on any muddy surface.

[Hyndis]

If its outside you can simply make it muddy and grow whatever that biome can support. IIRC, you can even grow stuff on constructed floors so long as its muddy.

Same rule applies for indoor areas, but only if you have discovered either a cave river or lake.

[LegoLord]

If you have an underground pool/river, and you've found it, then towercaps and shrubs will grow on any muddy surface.

Any muddy subterranean surface.

[Eagle]

If you have an underground pool/river, and you've found it, then towercaps and shrubs will grow on any muddy surface.

Any muddy subterranean surface.

Thats what i meant. Its not that hard to grow plants; the hard part is keeping your dwarves from trampling them.

[sweitx]

If you have an underground pool/river, and you've found it, then towercaps and shrubs will grow on any muddy surface.

Any muddy subterranean surface.

Thats what i meant. Its not that hard to grow plants; the hard part is keeping your dwarves from trampling them.

Depending on your aesthetic requirement, you can have several options.
1.  Wall off the grass/tree region and place only a single door (or even no door).  That way, dwarf will not path their way through it unless they actually need something in it (can be wall, grates, bars, statues, channel, channel with water, magma, etc).
2.  Mark the area as restricted, that way dwarf will de-prioritize pathing through it.

[LegoLord]

Restricted pathing zones don't prevent dwarves from walking through an area; it just makes them use an alternate route.  If a restricted route is the only route, then he will still take that route.

Captured goblins and windows can be utilized in the alternate path to prevent dwarves from actually taking it.  That gives spam, though.  You should have a door hooked up to a lever in front of the window, so that you can pull a switch and have the dwarves walk by it.

There should also be a door designated as "tightly closed" over the restricted path, because animals have reversed pathing priority.