Leuchtenbergia PRINCIPIS

Leuchtenbergia PRINCIPIS - Agave cactus, Leuchtenbergia principis.

The genus is represented by a single species!

The monotypic genus Leuchtenbergia includes the single species PRINCIPIS (from Latin principis - prince, duke), translated as princely leuchtenbergia, and resembles an agave rather than members of the cactus family. The genus was described in 1848 by Kew's renowned English botanist W. Hooker and named in honor of a passionate plant lover - the Duke of Leuchtenberg, Napoleon's stepson.

In nature, its range is scattered, and populations can often be separated from each other by dozens of kilometers, usually within the central Mexican Plateau. Plants prefer to settle in shaded spots among larger agaves and shrubs or on the shaded side of large rocky slopes. The stony soil of their native habitats is enriched with decomposition products of surrounding vegetation, creating a nutrient-rich medium for a well-developed root system.

Leuchtenbergia principis has leaf-like stem tubercles, usually triangular in cross-section, tapering from base to tips and measuring 10-12 cm (3.9-4.7 in) long. The felty areoles at the ends of these tubercles are adorned with papery spines, the longest of which reach 15 cm (5.9 in).

Bright yellow, fragrant cup-shaped flowers remain open for several days, and their diameter, depending on how widely the petals expand, ranges between 5-6 cm (2.0-2.4 in). Sometimes 2-3 flowers emerge simultaneously from the "flowering" part of an areole, only smaller in size, which is natural.

Long-lived specimens of leuchtenbergia reach 35 cm (13.8 in) in diameter in collections, and in natural conditions plants of unknown age occur whose height can reach up to 70 cm (27.6 in).

Seeds are sown into a mixture of leaf mold and coarse river sand over a layer of expanded clay (using a mix of cactus substrate and sand is also possible), moistened with a spray bottle, covered with film, and germinated in bright light but not direct sun at a temperature of 21-25 °C (70-77 °F). Seedlings need ventilation. Waterlogging and drying out of the sowings must be avoided.

Under optimal conditions, already at one year of age, seedlings develop a stable root system, allowing them to be used as rootstocks for slow-growing seedlings of other cactus species, such as ariocarpus and valuable astrophytum cultivars.

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Both in nature and in cultivation, the plants are distinguished by high resilience, enduring long periods without moisture and even short drops in ambient temperature down to 0 °C (32 °F). However, it is better not to risk it and keep leuchtenbergia with moderate watering during the growing season and completely dry during the winter period at 6-10 °C (43-50 °F). The only necessary condition for placing plants in collections is shading from scorching sun, since excessive light, as well as dropping winter temperatures below 5 °C (41 °F), causes reddening of the tubercle tips, which spreads along their edges to the very base and can lead to the death of the entire plant.

In adult specimens, drying out of tubercles on the lower part of the stem is frequently observed, but this is a natural phenomenon that should not cause alarm among collectors.

If root rot occurs, which is rare, the remaining healthy part of the plant can be re-rooted after preliminary drying. Even individual tubercles can root and eventually form new plants. However, this is only possible if the tubercle was detached from the mother plant together with a piece of the stem; otherwise, once rooted, it will sit indefinitely without any new growth.

The primary method of reproduction is generative. Large oval fruits 2.5-3 cm (1.0-1.2 in) long contain up to a hundred or more seeds, which when sown under standard conditions germinate readily and even at an early age mirror the appearance of their parents in miniature.