Dasylirion longissimum is best grown in loose, well-draining soil. Be sure to deeply water the soil to develop a good root system, allowing the soil to dry in between waterings; reduce frequency once established. Avoid watering the crown which can lead to rot. Give little to no water during winter as the seasonal rains may provide sufficient moisture. Mexican Grass Tree does not tolerate soggy conditions.

Plant in full sun, away from pathways to avoid encounters with the rigid leaves, and allow sufficient space around your Mexican Grass Tree to grow to full size. In extremely hot regions, Dasylirion longissimum may grow better with some light afternoon shade. The Mexican Grass Tree requires very little maintenance. Remove the dead, bottom leaves with pruners for a tidy appearance.

Dasylirion are dioecious, the plants are either male or female, the female plant will have decorative reddish seeds after flowering.  The male flower stalk is wheat colored. The plants may start blooming when the plant is mature, generally 7 years old or older, and may not bloom every year.

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