Trichocereus peruvianus 'Blue Form' (Peruvian Blue Torch)


Botanical Information

FamilyCactaceae
GenusTrichocereus
Speciesperuvianus
Cultivar'Blue Form'
SynonymsTrichocereus pachanoi (basionym), Cereus pachanoi, Trichocereus pachanoi
CategoryPerennials, Tropicals
OriginArgentina, Bolivia, Chile, Ecuador, and Peru.

Details

USDA Hardiness Zone8b - 10b
USDA Hardiness Ref.
Canadian Hardiness ZoneRequires cold season protection under glass.
Canada Hardiness Ref.
RHS Hardiness ZoneH2 - H4
RHS Hardiness Ref.
Temperature (°C)-9.4 - 10
Temperature (°F)15 - 50
Height3 m
Spread0.15 m
GrowthFast

Description and Growing Information

General DescriptionResembles the San Pedro (Trichocereus pachanoi) in form, but is different in colour and has longer thorns.
PropagationCan be easily rooted from offsets, which cluster around the base of the mother plant. Cut offsets close to the stem, at the narrowest possible place. When rooting cacti from cuttings, let the fresh cutting dry out slightly on a paper towel and cut the cacti at the narrowest place possible. After a few days to a few weeks, the cut surface will dry out and form a callous or slightly rough opening. Once the callous has formed, place the cutting in a rooting mixture of fast-draining cacti soil. Add small drainage holes in the growing container to help reduce chances of over-watering. The environment should be humid and ideally around 23°C, but do not place the growing medium directly on a heater. Fluorescent lighting is preferred for the first 3 months of growth. Only after a year should they be placed in direct light.
CultivationBest cultivated in a sterilized mix of sand, perlite and gravel. Prefers a drying period between waterings, even to the point where they slightly wilt. When watering, water deeply. The plant will noticeably plump up. Do not leave exposed to prolonged dampness and sitting water. Never put in a dish of water. Fertilize during the growing season for the best results.
Notable SpecimensCentennial Conservatory, Thunder Bay, Ontario, Canada.
Bark/Stem DescriptionThorns of 7-10 cm in length, 6 to 8 ribs with additional branches extending from the base.
Flower DescriptionLarge flowers open at night and are produced at the end of stems. Up to 24 cm long and up to 20 cm in diameter. Large flowers open at night and are produced at the end of stems. Up to 24 cm long and up to 20 cm in diameter.
Colour DescriptionBark is green-blue to blue. Flowers are white.

Photographs