I live in a student house where one of my fellow housemates has a cactus. She's incredibly bad in caring for her plants and pretty much doesn't give any attention to them whatsoever.
Though, she managed to keep one plant alive. However, that's probably because it's a cactus. Anyway, enough background information... This cactus suddenly started growing a stem and is starting to bloom (see pictures below). The picture with the stem is quite blurry because we couldn't focus on it.
We wonder if someone here knows what cactus this is and how to best to take care of it. We also wonder if it's normal that it grows a stem this large as we've never seen this.