Agave Plant Types Identification: Teeth, Spines, Rosettes

An agave is a rosette of stiff, fibrous leaves that usually carry teeth along the edges and a hard, very sharp spine at the tip, and most kinds flower once on a tall stalk and then die (Wikipedia). To name the type, work through these features:

• Teeth. Present or absent, large or small, curved or straight, and their color. Agave titanota is known for white teeth and edges; Agave bovicornuta for curved spines (Debra Lee Baldwin).
• Terminal spine. On Parry's agave the tip spine is dark tan, brown or black, darker than the leaf (Wikipedia).
• Leaf imprints. Some agaves show imprints on their leaves. Wikipedia describes indentations left by previous leaves on the back of Parry's agave leaves; Baldwin notes white lines or imprints on Agave impressa and A. parrasana.
• Leaf shape and color. Broad or thread-thin, flat or cupped, green, blue-gray, silver or striped.
• Rosette size and pups. Whether it stays small and solitary or throws offsets around the base.

The varieties below are from Debra Lee Baldwin's labeled agave gallery unless another source is named. Hardiness temperatures are Baldwin's.

• Agave americana (century plant) — large, offsets prolifically; hardy to 15°F. 'Marginata' and 'Mediopicta Alba' are the striped forms.
• Agave attenuata (foxtail) — soft, spineless leaves; hardy only to 32°F.
• Agave bracteosa — star-shaped (Baldwin), with no terminal spine and only minute marginal teeth (Wikipedia); hardy to 10°F.
• Agave filifera (thread-leaf) — thin leaves with threads; hardy to 15°F.
• Agave parryi — gray-green rosette with a dark tip spine; the Huachuca form reaches about 2 1/2 feet across (Wikipedia). Agave parryi var. truncata is the 'artichoke' agave.
• Agave victoriae-reginae — small and ornamental; Baldwin notes a 25-year bloom cycle.
• Agave vilmoriniana (octopus) — soft, pendant leaves; hardy to 20°F.
• Agave ovatifolia (whale's tongue) — broad leaves; hardy to 5°F.
• Agave tequilana — the tequila agave; hardy to 27°F.
• Agave stricta (hedgehog) — stiff, thin leaves; hardy to 25°F.
• Agave palmeri — leaves up to 4 feet (120 cm) with jagged edges and a thick 1 1/4 to 2 1/4 inch tip spine (Wikipedia).

Cold-hardiness is a practical clue in the field: an agave growing unprotected in a place with hard frosts is unlikely to be foxtail or octopus agave.

Several agaves grow wild in Arizona. The ones with native ranges confirmed on Wikipedia:

• Parry's agave (Agave parryi) — Arizona, New Mexico and northern Mexico; gray-green rosettes with dark tip spines and leaf imprints on the back; a twelve-foot stalk of bright yellow flowers; hardy to roughly -5°F, with reports of survival at -20°F.
• Palmer's agave (Agave palmeri) — southern Arizona, southwestern New Mexico, Sonora and Chihuahua, on dry rocky ground; the largest agave within US borders, with leaves up to 4 feet and a flower stalk up to 16 feet, flowering June to August.
• Desert agave (Agave deserti) — southern California, Arizona and Baja California; gray-green leaves 20-70 cm long with spines on the edges and tips; flowers at 20 to 40 years on a yellow-flowered stalk 2-6 m tall.
• Hohokam agave (Agave murpheyi) — found only at a few dozen Hohokam archaeological sites in southern Arizona and northern Sonora; green to blue-green leaves up to 80 cm with pale banding; NatureServe rates it Imperiled.

Arizona has more species than these four; a regional flora or a local native plant society can confirm the rest.

• Aloe. Aloes also grow as rosettes of thick, fleshy, water-storing leaves, but they belong to a different family (Asphodelaceae) and come from tropical and southern Africa, Madagascar, the Arabian Peninsula and nearby regions. Aloes can flower again and again, while most agaves die after flowering (Wikipedia). The 'American aloe' is in fact Agave americana.
• Hesperaloe (false yucca). A close relative in the same subfamily, from Texas and Mexico, with long narrow leaves that have no teeth or spines, only fibrous threads along the margins (Wikipedia).
• Cacti. Planet Desert points out that agave is often called a cactus but is a leafy succulent; cacti lack leaves. See the cactus identification chart.
• Other succulents. Small agaves such as A. victoriae-reginae are sometimes mistaken for other rosette succulents; see identify succulents.

The name 'century plant' overstates things. Planet Desert says agaves live about 25-30 years; Wikipedia says the wait depends on the vigor of the plant, soil and climate, citing some varieties that live 60 years before flowering, and gives desert agave 20 to 40 years. Debra Lee Baldwin lists early bloomers such as Agave angustifolia at 3-5 years. When the stalk appears, the rosette is at the end of its life, but most species leave offsets (pups) that carry on; Agave murpheyi survives mainly through bulbils, small plantlets formed on the flower stalk (Wikipedia).

The terminal spine is hard and very sharp; Wikipedia notes people once used agave spines as sewing needles. Wikipedia also records that the juice of some species can cause dermatitis. Wear gloves, long sleeves and eye protection when cutting or removing an agave, and keep sap off bare skin. If sap gets in the eyes, or a rash or a puncture wound looks worse over the following days, see a doctor. For a child or pet that has chewed the plant, call Poison Control at 1-800-222-1222 (US) or your veterinarian.

Photograph the whole rosette from above, one leaf edge close enough to show the teeth, the tip spine, and the back of a leaf for imprints. If there is a flower stalk, add it. With those, NatureLens can suggest the species from a photo (free scans every day), and you can check it against the features above.

Research and drafting for this page used AI assistance. Every measurement, date, price and claim was then checked against the sources listed below, which were opened and read on 2026-09-25. Where two sources give different numbers, both are shown.