Hi! My 4 year old cactus has shrunk and is turning brown at the bottom. I left it outdoors since summer (I live in Northern California, it gets down to 45-50 at night and we also had a rainy week 2 weeks ago), it also became soft to touch. Can this be due to cold or underwatering? I checked for bugs, but didn't find any. Is there any way I can help it? Please help us!
