Leuchtenbergia principis, commonly called the agave cactus, is a slow growing species of cacti native to the Chihuahaun desert in north-central Mexico where there are an estimated 500,000 plants growing in the wild. L. principis populations are threatened by illegal collection and livestock grazing and are considered to be at risk of extinction. Leuchtenbergia principis is the only species in the genus Leuchtenbergia, named after the duke of Leuchtenberg. The most distinct features of the species would be the extremely long tubricals, measuring 2 to 5 inches long, each tipped with an areole containing wool and long papery spines. This is a very unusual form for a cacti species, which gave rise to the common name for its resemblance to an agave plant. Leuchtenbergia principis have thick tuberous taproots and are hardy to zone 9a to 11b.
Sow the Leuchtenbergia principis seeds on the surface of a well draining potting mix. Sprinkle just enough soil over the seeds to cover them, and cover the soil with plastic wrap or a plastic bag to retain humidity. Keep the soil moist, but not soaking wet, and keep between 70°F and 80°F for best results. Once germinated, slowly uncover over several days to acclimate the seedlings to the ambient humidity. Germination typically takes 1 to 5 weeks to occur. Even with optimal conditions, germination may be slow and sporadic.
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