Botany - Indigo Plant

Depends on whether it is green or dry, and how hot the fire is. If it's dry, almost anything will burn it. If it is green, a hot prairie fire would probably consume it, but you couldn't get it to stay on fire on your own--not with matches, not even with gasoline.

I say this based on recent experience trying to burn botanical refuse while we clear our property.

Ditto Joe Smith. It's an herbaceous plant, and its properties of flammability will work much like any other, I suspect. Because of that, I doubt you'll be able to find any specific further information.

caw

More fun to pee on it, let it sit for a day or two, then BLUE!

But otherwise, yeah. There's nothing in indigo that makes it more or less burnable than your average plant.