Native & adapted

Saguaro

Carnegiea gigantea

Also known as Saguaro cactus · Giant saguaro

The signature cactus of the Sonoran Desert. It grows very slowly, feeds bats, birds and bees with its flowers and fruit, and needs almost nothing once settled except good drainage.

Sonoran nativeArid adaptedPollinatorEdible fruitVery low water

Landscape layersLower canopy · Understory

Mature size

20–40 ft tall and 2–10 ft wide after many decades; arms usually appear after 50 years

Climate fit

Urban core · USDA 9b–10a · Valley suburbs · USDA 9a–9b · Desert outskirts · USDA 8b–9b

Plant spacing

10 ft from walls, paving and other large plants

Frost

Tolerates brief freezes to about 20°F. Long cold nights can scar the growing tip of young plants.

Special categories

SONORAN DESERT NATIVE · ARID ADAPTED · POLLINATOR ATTRACTING · EDIBLE

Hardiness guidance

USDA 9a–11; established plants handle brief freezes into the low 20s°F

Winter chill

None

Typical harvest

Fruit ripens in June and splits open red at the top of the plant. A long pole is the traditional harvest tool.

Before you plant

These conditions determine whether it will thrive.

Soil chemistry

Rocky or sandy, fast-draining native soil. Never plant in a low spot where water collects.

Required microclimate

Placement is part of the growing system.

Open, sunny ground with good drainage. Keep it away from lawn sprinklers and drip lines.

Cold hardiness

Cover while young

Established saguaros handle brief dips to about 18°F. Young ones are tender at the growing tip, so cap the tip on hard freeze nights.

Leaves and wood: damaged below 18°F

Heat tolerance

Takes full sun and heat

Takes full and reflected sun once settled in. Transplants sunburn easily, so replant them facing the same way they grew and use shade cloth through the first summer.

Sources:

amwua.org , dbg.org

Right plant, right place

Will Saguaro grow at your Arizona property?

Protected by Arizona law. Moving, buying or removing one needs a state tag and permit. Mark which side faced south and plant it the same way to avoid sunburn.

Best regional fit: Urban core · USDA 9b–10a, Valley suburbs · USDA 9a–9b, Desert outskirts · USDA 8b–9b.

Light

Sun exposure

Full sun once established. Young saguaros grow best under a nurse tree such as palo verde or mesquite.

Water

Irrigation

Very low. A transplant gets a deep soak every 2 to 3 weeks in its first summer, then rain alone is usually enough. Overwatering causes rot and splitting.

Fruit set

Pollination

Night-flying bats, plus bees and white-winged doves by day.

Harvest

How to use it

The red pulp is eaten fresh or cooked into syrup and jam; the seeds are ground into a meal.

Planting & stewardship

How to help Saguaro thrive

1
Keep the original south face pointing south when transplanting.
2
Water sparingly, only in the warm season, and stop if the skin looks swollen.
3
Leave the nurse tree in place; it protects young saguaros from frost and sun.
4
Do not fertilize or prune.

Read the horticultural reference ↗