Agave americana

Description

The common name 'century plant' refers to its monocarpic habit: it flowers once at the end of its life, then dies but produces adventitious shoots from the base. Despite the name, it typically lives only 10 to 30 years. It has gray-green leaves 3-5 ft long with prickly margins and a heavy terminal spike. Near the end of its life, a tall branched stalk up to 30 ft tall bears yellow blossoms.

Cultivation

Agave americana is grown as an ornamental, valued for its large dramatic form, and is common in modernist, xeriscape, and desert-style cactus gardens. It suits hot, drought-prone climates and is used in dry beach gardens in Florida and coastal areas of the Southeastern United States. Its presence evokes Spanish colonial and Mexican provincial landscapes in the Southwestern US, California, and xeric regions of Mexico. As a houseplant, it tolerates light from direct sun to shade, requires minimal watering, and needs a winter rest at about 10 to 12°C. It thrives in highly porous sandy potting soil, should dry out between waterings, and is repotted annually in spring.

The World Checklist of Selected Plant Families recognizes two subspecies and two varieties: A. americana subsp. americana, subsp. protamericana, var. expansa, and var. oaxacensis. Cultivars include 'Marginata' (yellow leaf margins), 'Mediopicta' (broad cream central stripe), 'Mediopicta Alba' (central white band), 'Mediopicta Aurea' (central yellow band), 'Striata' (multiple yellow to white stripes), and 'Variegata' (white leaf edges). The parent species and several cultivars have received the Royal Horticultural Society's Award of Garden Merit.

Uses

In pre-Columbian Mexico, if the flower stem is cut before flowering, a sweet liquid called aguamiel can be collected from the hollowed heart and fermented into pulque or octli. In tequila-producing regions of Mexico, agaves are known as mezcales; A. americana is among the species used for mezcal, a high-alcohol distilled spirit. Tequila is specifically produced from Agave tequilana (blue agave). Unlike pulque, mezcal and tequila obtain sugars by heating the piñas in ovens rather than collecting aguamiel.

In Ecuador, the equivalent of pulque is called guarango, recently distilled as miske. The plant's use in fermented and distilled drinks may have prompted settlers to introduce it to Spanish Alta California; Chumash consultants reported seeing a mission priest collect juice from stalks, though the Chumash themselves did not produce alcoholic beverages. Agave nectar is marketed as a natural sweetener with a low glycemic index due to its high fructose content.

The leaves yield pita fiber, used for ropes, nets, bags, sacks, matting, coarse cloth, and leather embroidery (piteado). In California, after Spanish introduction, indigenous people like the Chumash used the fibers to make string as an alternative to native Hesperoyucca whipplei fibers, employing the cordage for string, sewing shoes, and possibly basketry handles. In Morocco, the fiber is described in materials-science literature as sabra fibre.