Sempervivum arachnoideum need full sun to light shade with a well drained soil mix. In the greenhouse, we use a soil mix consisting of 1 part peat moss to 2 parts loam to 2 parts coarse sand. I like to add small gravel to ensure good drainage. During the growing season, the plants are watered and allowed to dry slightly before watering again. Although they can take a great deal of drought, they seem to do better with regular watering. During the growing season, we fertilize plants monthly with a balanced fertilizer diluted to 1/2 the strength recommended on the label. During the winter months, plants are watered very little and nighttime temperatures are dropped to 48°F (9°C).