Stenocereus pruinosus aka Gray Ghost Organ Pipe
Taxonomy ID: 1455
Stenocereus pruinosus is a tall cactus in the Cactaceae family. Its native range runs from Mexico south to Honduras. People call it pitayo or Gray Ghost Organ Pipe. It grows in tropical forests that shed their leaves. It also grows in scrub and on disturbed land. Its home climate has a dry season. Plants grow at heights of 2,625–6,234 feet [800–1,900 metres] above sea level.
This cactus forms a large shrub or a small tree. Its usual height is 13–16 feet [4–5 metres]. Some plants reach 23 feet [7 metres]. One or more trunks support upright, column-like stems. Branching varies from sparse to dense, sometimes forming a V. Stems are grey-green to dark green. Young tips carry a pale, waxy coat. Most stems have five or six deep ribs with wavy edges. Some have as many as ten ribs. Brown felt covers the large areoles that bear flowers. Grey or brown spines grow from the areoles.
Flowers grow on fresh shoots near the stem tips. Each has a funnel shape and many yellow stamens. The inner flower parts are white or tinged with pink. In its native range, bloom starts in late February. It runs through May, then returns in September. Flowers open both by day and at night. This allows both day-flying and night-flying pollinators to visit. Fruit ripens from May through October. The egg-shaped fruit may be yellow, orange-green, or purple. Young fruit has spines, but the skin smooths as it ripens. The small, black seeds have a rough surface.
Plants can take full sun once they have adjusted to it. Warm-season water and feed support new growth. Use a pot with drainage holes. A high-potassium feed suits summer growth. Frost can harm this cactus. LLIFLE reports brief tolerance near 32°F [0°C] when kept dry. A bright, cool winter rest helps prevent thin growth. Withhold water and feed during this rest. The source suggests winter temperatures of 46–54°F [8–12°C].
People harvest fruit from wild, managed, and cultivated plants. They eat the sweet, juicy, dark-red flesh raw. Markets in Guatemala sell the fruit. Growers also use this cactus for living fences. These mark land boundaries and keep grazing animals out. The plant also provides wood. Useful Tropical Plants lists no known hazards or medicinal uses. That does not establish that every plant part is safe to eat. It reports a 2017 IUCN status of Least Concern. The species remains widespread and abundant, with no major known threats.
Common names
Gray Ghost Organ PipeMore information about Gray Ghost Organ Pipe
Where is Gray Ghost Organ Pipe native to?
Stenocereus pruinosus is native to southern Mexico and adjoining Central America, with confirmed populations in the Mexican states of Veracruz, Puebla, Oaxaca, Chiapas, Guerrero, San Luis Potosí, and Tamaulipas, as well as Guatemala and Honduras. It grows in arid and semi-arid habitats at elevations between roughly 800 and 1900 meters.
What do Gray Ghost Organ Pipe flowers look like?
The species produces funnel-shaped white flowers up to 9 cm long along its upper stems. Blooms open at night and remain open into the following day, a pattern typical of bat-pollinated columnar cacti. Successful flowers develop into ovoid fruits 5–12 cm long, green tinged with red, with very juicy sweet flesh that ranges from yellow and orange to red or deep purple.
How is Gray Ghost Organ Pipe pollinated?
Like most species in the genus Stenocereus, the night-opening, white, funnel-shaped flowers of S. pruinosus are visited primarily by nectar-feeding bats, with night-flying insects as secondary visitors. The flowers stay open into the following morning, allowing some daytime pollination as well.
Is Gray Ghost Organ Pipe edible?
The fruit, known locally as "pitaya de mayo," is eaten fresh and is described as very juicy and sweet with dark red pulp. Fruits are 5–12 cm long, green tinged red on the outside, with flesh that may be yellow, orange, red, or purple. They are a major wild and semi-cultivated food crop in southern Mexico and Guatemala and are widely sold in rural markets.
What are the medicinal uses of Gray Ghost Organ Pipe?
No medicinal uses have been recorded for Stenocereus pruinosus in the consulted sources.
What are the other uses of Gray Ghost Organ Pipe?
Beyond its fruit, Stenocereus pruinosus is widely planted as a living fence — its dense, spiny columnar stems are used to exclude livestock and to mark property boundaries across its native range. The wood is harvested for use in rustic construction, paralleling the genus-wide practice of using Stenocereus trunks as cane-like stakes for wattle-and-daub structures.
How do you propagate Gray Ghost Organ Pipe?
Stenocereus pruinosus is propagated by seed sown from the ripe fruit. As with other columnar cacti in the genus, vegetative propagation from stem cuttings is also feasible in cultivation.
How big does Gray Ghost Organ Pipe grow?
Stenocereus pruinosus is a tree-like columnar cactus typically reaching 4–5 m in height. It forms a clear, light glaucous trunk that branches sparsely to richly into stems 8–12 cm in diameter, each with six (rarely five to eight) ribs.
Can Gray Ghost Organ Pipe be grown outdoors?
Within its native range in southern Mexico and Central America, the species is grown wild, semi-cultivated, and as a fully cultivated fruit crop in arid and semi-arid environments at 800–1900 m elevation.
Sources
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