Euphorbia Tirucalli. Pencil Cactus. This can survive almost any amount of abandonment. Sculptural in form, this succulent can be pruned to the will of its caretaker; but be careful, as its milky latex can irritate your skin and eyes.
When planting succulents in containers use commercial cactus soil, which usually contains finely milled peat and sand. To this, he adds a product called Turfis, used by bonsai experts to aerate the soil, but says fine gravel works equally well. Mix the cactus soil and gravel in equal proportions and, voilà, the ideal planting medium.
Aloe polyphylla 'Spiral Aloe' We installed these several years ago and then the house was sold to a family with small children... several popped play-balls and they contacted us for help. We took them them out and put in a kid's veggie garden. In the meantime they had grown so big it took a crew of four to get them out safely.