I have a young Nannorhops that I bought from someone local that was grown from seed. When I bought it, it was nearly flawless and was uncharacteristically growing at a rapid pace. Ever since I've had it and of course left it outside in some upper 20's nights while also getting rainfall in the late summer. Since all this, it has formed some kind of brown discoloration of the fronds. Also, since I've had it, it has pushed out one new frond and of course the smaller spear which has this brown stuff