[Designer]

"..gypsum weed.."

That's Jimson weed, son.

Gypsum is calcium carbonate, and nothing grows in it. Not even Jimson weed.

[laney]

I stand corrected...:)

[Cuttnhorse]

Gypsum is calcium carbonate, and nothing grows in it. Not even Jimson weed.

Bzzzzt, Gypsum is a hydrated calcium sulphate and is commonly used as a soil conditioner...Jimson weed would probably grow quite nicely it.