Reader Photos – ID and Help, too
I have attached 4 pictures, the same ones I have on my blog.
The two rounder ones are doing fine but the other two seem to not like the cold so much. They shriveled and turned yellow. That’s bad right?
Your Echinopsis chamaecereus look fine for this time of year (#1 & #2). The Cereus hildmannianus monstrose (Fairy Castles) (#3) is showing frost/freeze damage, being a “miniature mutant” it is less tollerant of cold, wet weather than the true species is. Try and keep it dry for the rest of the winter and hopefully it will grow out of the damage in the spring. But watch for rot, as it may more damaged than it looks in the photo. The Hylocereus (#4) is a tropical jungle cactus and will not usually survive heavy frosts or freezes. It really is a houseplant that needs to be treated more like an orchid than a cactus. Try moving to a warm spot and keeping it dry for a month and see it it comes out of it, all though I have to say from the photo, I think it might be too damaged and is on it’s way to being black slime.
Take care and good luck,