Chris Sullivan wishes he hadn't bothered to install an irrigation system. The garden that he and wife, Margaret, designed and planted 2 1/2 years ago needs no water other than the occasional rainstorm, although "we do hose off the barrel cactuses in summer if they're dusty," Chris says.
Golden barrel cactuses are showing up in more dry landscapes these days, and not just because they need so little irrigation. Designers often use golden barrels to provide intriguing texture, dramatic pattern (when used in numbers) and bright color year-round. When backlit, the golden spines surround the plant with a glowing halo. In spring, buds form a whorl at the crown, and a succession of satiny yellow flowers unfurl for months.
"Golden barrels are more popular than ever," says Molly Thongthiraj, co-owner of California Cactus Center in Pasadena.
Five years ago, the store provided the Getty Center with 552 of the spiny tuffets for the South Promontory garden. The plants -- 15 to 19 inches in diameter when installed -- are now 20 to 24 inches, Thongthiraj says. The inch-per-year growth rate slows as golden barrels approach about 36 inches in diameter.
Golden barrels tolerate more irrigation than other cactuses and consequently do not rot as easily. Thongthiraj says the plants do equally well in desert gardens and in landscapes that require slightly more water.
"They're the perfect finishing touch for a succulent garden," she says.
The Sullivans' previous residence mixed spherical and columnar cactuses with aloes, agaves, kalanchoes and other succulents -- plants that store water in fleshy leaves and stems in order to survive drought.
The couple's new home has a front garden that's smaller, so they disciplined themselves.
"With succulents, it's tempting to want one of everything," Margaret says.
They went with a limited palette of barrel cactuses and other sculptural, architectural plants that suited the contemporary lines of their remodeled home. Against a backdrop of greenish tan walls, columnar cactuses mix with Yucca rostrata trees with strappy leaves.
Chris planted one yucca so its trunk was parallel to the ground. The tree has since curved upward, lending a sculptural element that contrasts effectively with the angular hardscape and the setting's strong vertical lines.
Enhancing the composition are boulders from the couple's previous garden. Other transplants include low-water Mexican blue palms (Brahea armata) and a type of Kalanchoe beharensis called Napoleon's Hat, a diminutive succulent tree with boat-shaped, feltlike leaves.
Through it all, clusters of golden barrel cactuses pop up like spiny beach balls.
The Sullivans made a point not to place the plants equidistant from each other.
"We gave some thought to how they might look in nature," Margaret says. "Randomly spaced, odd-numbered groupings seemed to work best."
Because the soil was compacted -- "like concrete," Chris says -- they hired a crew to haul a significant amount to the dump.
"We brought in 10 yards of decomposed granite for the substrate," he says. "On top of that went a blend of decomposed granite and cactus mix. Our main goal was good drainage. These plants need loose soil that drains well."
The top dressing is 3/8 -inch golden gravel. The installation probably cost more than a typical frontyard landscape, Chris said, unable to provide specifics since many of the plants came from their previous residence. "But it's 100 times less work than a lawn."
The new garden gets no pesticides or fertilizer, and rabbits that dine on the neighbors' ornamental plants leave the Sullivans' garden alone. Chris takes a hands-off approach too, using long-handled tweezers to extract weeds growing close to the cactuses.
Easy maintenance is one of the allures. Thongthiraj says her father, who founded the California Cactus Center 35 years ago, had a passion for golden barrels.
"He taught us kids how to collect and germinate the seeds," she says. "We used to hate having to do it. His goal was to have a million of them."
The nursery may not have a million of them, but propagating golden barrels has proved worthwhile.
"Surprisingly, they're hugely popular in China," Thongthiraj says. "We ship them there all the time -- whole containers full."
Baldwin is the author of "Designing With Succulents"; you can find her blog at debraleebaldwin.com. For the Home section's drought-tolerant gardening column, go to latimes.com/home and click on "Dry Garden" in the category cloud.
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Some like it hot . . . or cool
Siting: Golden barrel cactus (Echinocactus grusonii) can thrive in hot, dry landscapes but is native to coastal Mexico, so it doesn't mind cool, misty conditions. It is hardy to about 20 degrees.
Digging: A transplanted barrel doesn't require a deep hole, but if it's too shallow, the weight of the plant may crush its roots. Trim them and they will grow back rapidly. Give roots about a week to heal before watering.