What it means
An ocotillo is the plant that makes newcomers ask whether the landscaping is dead. For most of the year it is a fountain of long, gray, thorny canes rising from a single base, 40 to 75 of them, ten to fifteen feet tall, with nothing green on them at all. Then it rains, and within a few days every cane is sleeved in small bright leaves. The desert dries, the leaves drop, and the plant goes gray again until the next storm. The desert plants field guide puts it plainly: not a cactus, and not dead, whatever it looks like.
Locals use the word three ways. For the plant, pronounced oh-koh-TEE-yoh. For the bloom, “the ocotillos are going,” meaning the red tips of March and April that bring the hummingbirds. And for the fence, the rows of cut canes wired together that outline old ranch yards from Cave Creek to Pinnacle Peak, a surprising number of them still alive.
Where you’ll meet it
On every rocky slope in the Preserve, where it stands out against the saguaros; in resort landscaping, where it is the one plant guaranteed to be asked about; labeled at the Xeriscape Garden; and in the week after a monsoon storm, when the whole north end of town turns briefly green.
Where the word came from
Ocotillo is Mexican Spanish, a diminutive built on ocote, which comes from the Nahuatl word for a resinous pine used as a torch. The Forest Service renders it as “little torch,” which fits both the red flame at the tips in spring and the old practice of burning the resinous canes. English speakers borrowed the Spanish word whole and kept the pronunciation, with a few regional alternates that never caught on here: coachwhip, candlewood, Jacob’s staff, buggy whip.
The botany is stranger than the name. The plant is Fouquieria splendens, the only member of its genus north of the border and part of a small family, Fouquieriaceae, whose closest relatives are the tea family and the heaths. It is a semi-succulent shrub, not a cactus. The spines are the hardened stalks of the first leaves of each season; new leaves then sprout from the base of each spine when there is water, and are shed when there is not. Between leaf crops the canes carry on photosynthesis through chlorophyll in the bark, the same trick the palo verde uses. A plant can run through the cycle four or five times in a wet year, and barely once in a dry one.
Growth is slow and life is long. Ocotillos reach maturity somewhere between 60 and 100 years, and large old plants with dozens of canes are the age of the first ranches. The flowers come once in spring, from March into June depending on elevation, in dense red clusters at the tips that last six to eight weeks; hummingbirds moving north time themselves to the bloom and carpenter bees do much of the rest. The flowers are edible, with a tangy taste.
What it is not
Not a cactus, as above. Not a cholla, which is a cactus with segmented, spine-covered joints that detach. Not dead when leafless. And not the “ocotillo” of Baja California, the boojum tree, which is a cousin in the same family and looks like an upside-down carrot.
The fine print
The ocotillo’s range runs across the Sonoran and Chihuahuan deserts from southeastern California to west Texas and deep into Mexico, on rocky, well-drained slopes and bajadas. Cold is its limit, not heat: it tolerates roughly 10 degrees and stays below the elevations where hard freezes last. In Scottsdale that means it is everywhere on the McDowell slopes and nowhere in the frost pockets of the washes.
In the yard, the rules follow the biology. Transplants should be set with the same orientation they grew in, since the south side has built up sun tolerance. Water weekly through the first summer to get roots started, then back off to storms plus an occasional deep soak. Leaves on a yard ocotillo in a dry week mean someone is watering it, fine in moderation and fatal in clay that never drains. An ocotillo that stays bare through a wet August and whose canes snap dry is dead; one that leafs out and drops within a month is doing exactly what it should.
The living fence is the plant’s one agricultural career. Fresh-cut canes set in a trench, wired at the top and watered will root, though sources are honest that the rate is modest and the wait is a year or more; the fences around old homesteads in Cave Creek and along the Rio Verde road are the ones that took. Nurseries sell pre-built panels. The field guide’s advice stands: look, do not touch, and give it a week after the storm before you judge it.