Agave parrasana, the cabbage head agave or cabbage head century plant, is a flowering plant in the family Asparagaceae. A slow-growing evergreen succulent from North East Mexico, it produces a compact rosette of fleshy thorn-tipped grey-green leaves, 60 cm tall and wide. Occasionally mature plants produce a spectacular flower head up to 6m tall, opening red and turning yellow. This signals the death of the flowering rosette, however, offsets may form and continue growing. As it can tolerate temperatures of −12 °C (10 °F) or less, it is a popular plant to grow outdoors in a sheltered cactus garden or similar environment and has gained the Royal Horticultural Society’s Award of Garden Merit.
Agave plants love going outside in the warm weather. During the fall and winter, when agave plants are resting, allow the top 75% of the soil to dry out before watering. In the spring & summer, when the plant is actively growing, water when the top 2"-3” of soil has dried out.