Agave UTAHENSIS 'EBORISPINA'

Agave UTAHENSIS 'EBORISPINA' - Ivory-spined Utah agave, Agave utahensis 'Eborispina'.

Agave is a genus of evergreen perennial herbaceous plants in the asparagus family (Asparagaceae), comprising about 300 species distributed across the Caribbean islands and in arid regions of North, Central, and South America. No more than 50 species are common in cultivation.

Representatives of the genus form rosettes of fleshy leaves, often with prickly margins and sharp tips. Leaves can be broad or narrow, colored in gray-green, glaucous, or green shades, sometimes with variegated coloration. The stem is typically shortened. The plants are adapted to prolonged droughts, spreading broadly with powerful roots, absorbing moisture from surface soil layers and storing it in their leaves.

Flowering occurs at 15-20 years of age, after which the plant dies. A tall flower stalk emerges from the rosette of robust leaves, bearing an inflorescence at its top in the form of a panicle or raceme, usually yellow or cream-colored. The fruits are capsules with flat seeds. After the seeds mature, the aboveground parts of the mother plant die off, and offsets sprout from the rhizomes.

The ivory-spined Utah agave has gray-green leaves with a waxy coating, forming a dense symmetrical rosette 20-30 cm (8-12 in) in diameter and up to 30 cm (12 in) in height. The leaf margins are protected by numerous light beige teeth (eboreus - "made of ivory", spina - "spine"), ending in spectacular straight or wavy spines that can reach up to 20 cm (8 in) in length. Most plants form numerous rosettes and spread significantly in width. At maturity, in late winter, the plant sends up a huge flower stalk 2-3.5 m (6.6-11.5 ft) long with rather large yellow flowers.

Seeds are soaked for 2-3 hours in water or fungicide, then sown to a depth of 0.5-1 cm (0.2-0.4 in) into a light loose substrate consisting of sand, peat, and perlite, and covered with a layer of soil. The sowing is moistened with a spray bottle, placed in a mini-greenhouse or covered with film, and germinated in light, but not in direct sun, at a temperature of 22-26 °C (72-79 °F). Seedlings require ventilation. Waterlogging and drying out of the sowings must be avoided.

Seedlings appear within 15-25 days. The maximum germination period can be more than 40 days. After the appearance of 2-3 true leaves, pricking out is carried out into individual 6 cm (2.4 in) pots with light substrate and drainage, and after a year into 8-9 cm (3.1-3.5 in) pots. Adult specimens are repotted once every 2-3 years.

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The plant can be grown indoors under good illumination. Placement on south- or southwest-facing windows with maximum light access is preferred. In summer, keeping it on a balcony or in the garden with rain protection is possible. Large specimens in winter are kept in a cool, bright, dry room. The temperature is maintained at 20-28 °C (68-82 °F) in summer and not below 10 °C (50 °F) in winter.

Watering is carried out moderately, only after the soil dries out. In winter, watering frequency is reduced. Waterlogging or water stagnation at the roots is not allowed. During the period of active growth from March to August, specialized fertilizers for cacti and succulents with low nitrogen content are applied once every 4-6 weeks.

A loose, well-draining substrate with an admixture of sand, perlite, and fine gravel is used. Repotting is carried out once every 2-3 years or as needed. The root collar is not buried, and drainage is mandatory.

Shaping is not required. Propagation is carried out by seeds, offsets, and rhizome cuttings separated in spring or summer.