Plate No. 38
Cardón
Pachycereus pringlei
"The giant of the Baja peninsula"
Native to
Baja California and Sonora, Mexico

History
A brief account
The tallest cactus in the world — reaching nineteen metres and living more than 300 years. Its enormous columns dominate the Baja landscape. Nitrogen-fixing bacteria in its roots let it colonise bare rock where nothing else will grow.
How to care for
Cardón (Pachycereus pringlei) grows best when its natural cycle of strong light, freely draining soil and measured watering is respected. Give it full sun. Water it according to its seasonal needs: deeply but rarely in summer; nothing in winter. Plant it in sharp mineral mix with gravel. A container with an unobstructed drainage hole is essential, because moisture lingering around cactus roots can quickly lead to rot.
Keep its temperature needs in mind: -4 to 40°c. brief light frost survivable. During active growth, check the compost before watering rather than following a rigid calendar, since heat, light and pot size all change how quickly it dries. Reduce watering during cool or dormant periods, keep the plant well ventilated, and wait until the growing medium is dry before watering again.
How to propagate
From seed. Cuttings root but grow slowly. Take material from healthy growth with a clean blade or tongs, then leave the cut surface in a dry, shaded place until it forms a firm callus. Set it into a dry, gritty medium and introduce water sparingly only after roots begin to develop.
Young cacti are especially vulnerable to excess moisture. Use a small pot with excellent drainage, provide bright filtered light while roots establish, and move the new plant gradually into the light, temperature and watering conditions preferred by a mature Cardón.
Cultivation
Quick tips for care & planting
- Light
- Full sun.
- Water
- Deeply but rarely in summer; nothing in winter.
- Soil
- Sharp mineral mix with gravel.
- Temperature
- -4 to 40°C. Brief light frost survivable.
- Propagation
- From seed. Cuttings root but grow slowly.