Carnegiea gigantea

Common Names

Saguaro, Saguaro Cactus, Saguaros, Saguaro Cacti, Giant Cactus, Sage of the Desert, Monument of the Desert

Summary

The saguaro cactus is a large, tree-like columnar plant native to the Sonoran Desert of the southwestern United States and northern Mexico. It grows upright to substantial heights, commonly 40–60 ft, with arms developing from the trunk as it matures, and it stores water in a pleated stem. Distinctive features include white, night-blooming flowers near the stem apex and red, fleshy edible fruits; the plant is long-lived, with lifespans around 150–200 years, and woodpeckers create nesting cavities that support other desert wildlife. An iconic symbol of the region and designated as Arizona’s state flower, the saguaro is a dramatic focal point in desert landscapes.

In cultivation, full sun and very well-drained soil are essential, with frost sensitivity and drought tolerance guiding maintenance; irrigation should be infrequent and mainly during the growing season, and establishment benefits from shade for young plants. Propagation is by seeds; plants are slow-growing and require substantial root space; in landscape use, the saguaro acts as a dominant focal point in xeriscapes and large-scale desert settings. Ethnobotanical and practical uses include edible fruits and seeds; in native culture, fruits and parts have traditional culinary and ceremonial significance, and dead plants or ribs have been used for building materials and other uses.

Lifecycle

Perennial

Height

40-60 feet

Spread

1-2.5 feet

Hardiness Zones

Zones 8a-11b

Sunlight Requirements

Ideally full sun; tolerates partial sun and partial shade, with partial shade when young and full sun later.

Soil Type

Well-drained sandy soil

Soil Drainage

Well-drained soil

Soil pH

Neutral (around pH 7)

Bloom Color

White

Bloom Time

Spring

Foliage Color

Green

Fall Foliage Color

No fall foliage color

Leaf Lifecycle

Other

Growth Rate

Very slow growing; about 0.2–5 cm per year (roughly 0.1–2 inches per year), taking decades to reach maturity

Seasons of Interest

Spring and Summer

Propagation Methods

Seeds, rare vegetative offsets

Attracts Wildlife

Attracts bees, Attracts other pollinators, Attracts birds