Cut plants command can actually keep areas clean... permanently!

[UrbanBourbon]

I've been playing RimWorld for a total of dozens of hours and just recently I discovered that if you clear the grass completely, TWICE, inside a walled off area, the grass actually doesn't grow back. EVER. Woo hoo! The reason I started cutting it was because I wanted a break from all the wildfires. I thought "Hell, I'll keep it clear until I get tired of cutting it and that's it." I was in for a pleasant surprise.

*grumble mumble..*
"Hmm.. The area's been clear for a while now. Not complaining though.."
"Ok, it definitely should've grown back by now. M-m-maybe it...? Could it be...? HOW COME I DIDN'T KNOW THAT!"

Previously I had obviously tried to clear areas but got disappointed when I saw the grass grow back, assuming that it grows back no matter what.

Look at it. JUST LOOK AT IT. It's been that way for like a week now. My plant cutters are unemployed! That's a good thing!

[Monkfish]

I've always assumed that grass spreads rather than just growing out of nothing. My assumption in your case is that the grass can't, for whatever reason, spread down the narrow opening at the top of your complex.

[ousire]

I have a walled off area that plants continue to grow in despite how often I cut it

[Monkfish]

Maybe not then. 

[Nasikabatrachus]

If you look closely, you may notice little green dots emerge from plants, move across the terrain, and land somewhere else, generating a new plant. That's how plants spread. Walls, chokepoints, and even stretches of rough rock floor out in the open can isolate one patch of soil from another. In this way, fires, animals, and colonists can change the "ecology" of isolated areas through selective destruction of plants. I've been cultivating wild berry and agave plants in my games for a while using this method; it's even possible to get a large patch of such plants growing in an open area if you're good about keeping the grass away.

[Serrate Bloodrage]

If you zoom in close you can actually watch the little spawns happen from mature grass. I though it was just some little graphic meant to symbolise insects but there is spores that fly from all mature plants! I now cultivate Agave this way. The natural agave doesnt get affected by blights either =D

[Serrate Bloodrage]

Beat me by one minute Nasika lol

[UrbanBourbon]

I've been cultivating wild berry and agave plants in my games for a while using this method; it's even possible to get a large patch of such plants growing in an open area if you're good about keeping the grass away.

Praise Tynan! I'm going to blanket my lands with agave plants.

[Nasikabatrachus]

Inspired by this thread, I made a very simple mod that prevents any plants from growing on sand:

http://ludeon.com/forums/index.php?topic=2624.0

The thing about grass is that soil seems bare without it, but it looks terrible on sand.