Century plant
Also known as
American century plant, American agave, Sentry plant, American aloe, Maguey
Keep this plant’s care guide close at hand.
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Agave americana, commonly called the century plant, is a striking, monocarpic succulent native to Mexico but naturalized across warm, dry regions worldwide. It forms an architectural rosette 1.5–3 m across of thick, blue-gray to green leaves armed with recurved marginal teeth and a formidable terminal spine. Extremely drought tolerant and adapted to poor, fast-draining soils, it uses CAM photosynthesis to conserve water. Plants mature slowly; after 10–30+ years they send up a dramatic branched flower stalk 6–8 m tall bearing nectar-rich yellow blossoms that attract hummingbirds, bats, and insects. The parent rosette dies after flowering, but offsets (pups) around the base perpetuate the colony. Historically valued for fiber and fermented beverages, A. americana is also a signature xeriscape specimen in coastal and desert gardens. It thrives in full sun, wind, and heat, yet requires careful handling: the sap can irritate skin and the armature can injure. Provide space, superb drainage, and minimal watering to keep it healthy.
Taxonomy
Properties & Requirements
How to care for Century plant
Water
Water deeply but infrequently using a soak-and-dry approach. In containers, allow the mix to dry completely to the drainage holes before rewatering. In hot, bright weather this may be every 2–4 weeks; in cool seasons it can stretch to 4–8+ weeks. Avoid letting water pool in the rosette, especially in cool, humid conditions. Overwatering is the primary killer—err on the dry side and ensure rapid drainage.
Light
Provide full sun to very bright light. Outdoors, aim for 6–10 hours of direct sun; coastal and high-desert sites suit it well. In very hot interiors or low-latitude summers, offer light afternoon shade to prevent scorch, particularly on variegated or newly planted specimens. Indoors, place at a south or west window and rotate for even growth; supplemental grow lights (12–14 hours/day) help maintain compact form.
Nutrients
Feed sparingly. During active growth (spring–summer), apply a low-nitrogen, cactus/succulent fertilizer at 1/4–1/2 strength once every 4–8 weeks. Avoid high-nitrogen formulations that produce soft, rot-prone tissue. In lean, in-ground xeriscapes, seasonal feeding is often unnecessary. Flush pots with plain water occasionally to reduce salt buildup, and never fertilize dry roots. Withhold fertilizer in autumn and winter, or whenever temperatures are cool and light is low, to prevent weak, elongated growth.
Temperature
Best growth occurs between 65–90°F (18–32°C) with excellent air movement. Established plants are surprisingly cold-hardy if kept dry, tolerating brief dips to about 15–20°F (−9 to −6°C); container plants are less tolerant and should be sheltered below 25°F (−4°C). Protect from prolonged freezing, wet cold, and hard frost on young or variegated forms. Indoors, keep nights above 50°F (10°C) for active growth and avoid stuffy, stagnant air.
