Hi Everyone, I was wondering if anyone could help with a weird cactus problem? I Have a bit of a cactus collection, and they all seem really happy, but a couple of months ago I put together a cactus garden for my husband's desk at work, and today he got in to the office to discover that the centre cactus had completely deflated! All the other cacti are fine, and I'm hoping it's not contagious. The cactus in question is a mammillaria, although exactly which sub-species I'm not entirely sure. The cactus seems gushy, smells funny and its spines pull off really easily, sometimes with some of the flesh still attached. Strangely enough, it is still a really healthy colour - just flat (and stinky)! It puts me in mind of a flat, spiky sponge. My husband has watered them only twice since he took them to work (not at all for several weeks after potting - as per my instructions), so I don't see how over watering could be a problem. Yes, there is drainage in the pot. They probably don't get a great deal of sun on his desk, as his window faces South (North is best here in the Southern Hemisphere - all my own cacti are on the North facing patio, and love it). At this stage I'm thinking that the best move will be to remove the flat cactus, repot the others with fresh potting mix, and give them a good week in the sun. I'm assuming that resuscitation is not an option? I'd still like to know what has happened to it so that I can hopefully prevent its occurring again! Help! DiiDii.