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A silvery leaved species fron Northern Argentina. Currently growing in the Agave house, which
is just tall enough to contain it. It has grown in the greenhouse for a dozen years, slowly overgrowing its allotted space. In spring this year (2024) I planted it outside and then almost immediately discovered that is is rare, endangered and not known to be hardy. It will have to come up out of the ground and back into the Agave house. The Tropical Britain website says: "Puya castellanosii is a large terrestrial succulent bromeliad from the Northern Argentinean Andes where it grows in extensive colonies on dry slopes and mountain sides at elevations between 2300 and 3500 metres. Growing to a height of 1.5m and forming large clumps to 3m across, Puya castellanosi is a dramatic and highly architectural bromeliad with very long silvery blue-green leaves that are edged with brown recurved spines typical of the genus and forming a dense barbed rosette. It has a huge and very striking inflorescence of tubular pale whitish-blue flowers held on branched bracts that are a deep rich pinky-purple in colour and covered in a fine silvery tormentum. It can reach up to 2m in height. In its natural habitat, Puya castellanosi is one of the dominant species in a barren terrain of rocky surfaces and exposed upland pasture consisting of xeriphytic grasses and sparse, wind-blown dwarf shrubs. The soils are dry and free-draining, comprised of sand, rock and scree with very little moisture-retaining organic content. This dry arid soil is high in calcisols, dominated by calcium carbonate as powdery lime or rocky concretions. Puya castellanosi often gains a foothold in shallow depressions on the mountainous slopes where this eroded calcareous rubble has collected. Red Triassic sandstones reminiscent of Devon are prevalent throughout much of this region. The climate at these elevations is harsh with high solar radiation and extremes of intense daytime heat and low temperatures during the night. A dry winter and warm summer is the usual seasonal norm with temperatures in July, the coldest month, going down to -1.2 C at night. Strong driving winds, freezing temperatures and snowstorms all form part of the weather patterns in this rugged environment. Taxonomically, Puya castellanosii is classified in the subgenus Puya, which differs from subgenus Puyopsis by lacking fertile flowers at the apex of the branches of inflorescences. Its nearest genetic relative is Puya raimondii, the largest Bromeliad in the world." |
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| 15th July 2012 | ||
