Pilosocereus pachycladus

RHS Plant Profile
blue torch cactus

Other common names

blue columnar cactus

Cactus Succulent

A slow-growing, upright cactus with columnar, branching, blue-green stems, ribbed and lined with areoles bearing tan-coloured spines and fine white hairs. Can reach up to 10m in its native range but much smaller in cultivation. In summer, funnel shaped white flowers, sometimes flushed with red at the tips, are produced at night, and are followed by fig-shaped fruits

Position

Full sun

Soil Types

Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
5–10 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Sand
Moisture
Well–drained
pH
Acid or Neutral

Position

Full sun
Aspect
South–facing
Exposure
Sheltered
Hardiness
H1B
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Cactaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Columnar upright, Spreading branched
Genus
Pilosocereus is a genus of vigorous and fast-growing cacti which often become large in size, with some varieties reaching over 4m. Some species are branched in form and night-flowering whilst other are more shrub or tree-like. Many have an attractive blue colour. Flowers are funnel-shaped with greenish or reddish outer segments.
Name Status
Correct
Plant Range
Brazil

How to Grow

Cultivation

Grow in a standard cactus mix with sharp drainage, in a bright sunny spot; could be placed outdoors in a sheltered spot in summer. Ensure a minimum temperature of 12°C year round. Water freely in late spring and summer, keep just moist at other times. See houseplant cacti and succulent cultivation

Propagation

Propagate by seed, sown at 19-24°C in spring

Suggested planting locations and garden types

  • Architectural
  • Houseplants
  • Patio and container plants
  • Conservatory and greenhouse

Pruning

No pruning required

Pests

May be susceptible to mealybugs, and to ants if planted outdoors

Diseases

Generally disease-free, though over-watering will cause rot