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Yucca x queretaroensis ‘RTT’ (Hybrid Queretaro Yucca) - A single stemmed upright plant with a thick trunk to 12 feet tall. Like true Yucca queretaroensis, this plant bears at the top of its stem bright green rigid leaves that are 18-24 inch long and radiate outwards like a rounded head of hair but these leaves differ from Yucca queretaroensis, which has leaves that are extremely narrow, less than 1/8 inch wide, and square in cross section, by being flat and ½ inch wide. In habitat the inflorescence of Yucca queretaroensis arise from amongst the leaves to 2 to 3 feet and bear white flowers, but this hybrid plant has not been in cultivation long enough to know whether it will flower regularly given garden conditions.
Plant in full sun in a well-drained soil where it requires little to no irrigation once established in our coastal climate.
Yucca queretaroensis was first described in 1989 in "Cactaceas y Suculentas Mexicanas" Vol. 34 (3) by Ignacio Piña Lujan. It was described from plants collected from the Mexican state of Queretaro where it grows in small colonies on the steep slopes from 3,300 to 4,300 feet – for more information about this unique and beautiful plant see our web listing for the species at Yucca queretaroensis.
Our original plants of Yucca queretaroensis, which we sold from 2011 until 2013 were grown from seed purchased from rarepalmseeds.com in 2009 and this seed produced plants with leaves of varying widths, which led many us to believe some was the result of hybridization with another species. Since both Yucca filifera and Yucca queretaroensis are found growing together sympatrically in the area the seed was collected, the assumption was that these wider leafed plants are hybrids between these two species. We have a beautiful selected narrow leaf plant in a large container in the nursery and several of the wider leafed plants purchased from us were planted out by Jeff Chemnick in his Aloes in Wonderland Garden in the Santa Barbara foothills .
Our more recent crop of Yucca queretaroensis were grown from micropropagated laboratory plants (tissue culture) purchased from Rancho Tissue Technologies in 2024. It was clear from the onset that while the plants were heathy and vigorous, they were not the true Yucca queretaroensis and the plant chosen to be propagated form in the lab was likely a hybrid, probably the result of a cross between Yucca filifera and Yucca queretaroensis with the wider leaves, so we list this crop as Yucca x queretaroensis ‘RTT’. We also long grew the similar Yucca linearifolia, which is a much friendlier plants with more pliable less sharp leaves.
This information about Yucca x queretaroensis 'RTT' displayed is based on research conducted in our horticultural library and from reliable online resources. We also will relate observations made about it as it grows in our nursery gardens and other gardens we have visited, as well how the crops have performed in containers in our nursery field. We will also incorporate comments that we receive from others and we welcome hearing from anyone with additional information, particularly if they can share any cultural information that would aid others in growing it.
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