Backyard Barrel Cactus
July 26, 2010
We’ve lived in this house for ten years this month. To celebrate the anniversary, I’ve been taking photos of the yard to compare with pictures that we took when we moved in. The mostly-barren gravelscape has become a beautiful desert garden. We have planted most things, such as desert oaks, agaves, soapberry, pomegranates, citrus trees, etc. But several plants (soaptree yuccas, mesquite and palo verde trees, ephedra, desert hackberry, and many wildflowers) have moved in on their own…along with lizards, hummingbirds, quail, native bees, and other creatures. We have several Arizona barrel cacti (Ferocactus wislizenii), also called the compass barrel because they eventually turn to face south as they grow. The desert near our house is a natural “barrel garden” where these cacti are abundant, with an unusually high percentage of crested and multiheaded specimens. Below is our largest barrel, growing wild in our backyard, with comparative photos from 2000 and 2010 to show how it’s grown. We also have five salvaged barrels that are about a foot tall, and eight tiny babies, 1 to 3 inches in diameter, that have appeared in the yard in the last couple of years. When you quit spraying weedkiller, LIFE happens!

Arizona Barrel Cactus - 2000 and 2010
Bloom Day: Pima Pineapple Cactus
July 16, 2010
Five days after the first significant summer rain…you can count on that to be Bloom Day for Coryphantha robustispina, the Pima Pineapple Cactus. For me, this event captures the bright, ephemeral essence of summer, with dozens of sunlike flowers peering out of the spines. The yellow flowers are slightly fluorescent and have a nearly metallic luster that creates a soft glow over the land, especially since Bloom Day is usually humid and partly cloudy, with restless monsoon clouds and the occasional rumble of thunder over the mountains. Yesterday was the biggest bloom, but a few plants have small flowerbuds that will probably open after the next rain.

Pima Pineapple Cactus
Ten years ago this month, we moved to Arizona and within a few days we discovered some of these endangered cacti near our house. Scattered over an acre of flat, gravelly desert, it’s the densest known population. Over the next few years, we found several more sites, some of which have since been destroyed for new housing developments or as the land is bladed and abandoned. But the original acre that we named ”Pineapple Cactus Land” – split between private and state ownership, cycling through various intermittent and impermanent forms of protection, disputed by researchers, ignored by politicians, degraded by ranching, eyed greedily by developers - remains a hidden garden for these beautiful plants. We rejoice that it has survived to bloom for another year.

Pima Pineapple Cactus Flower
Monsoons are Here!
July 11, 2010
Hot, humid, and hazy, with spectacular cloud buildups and (if we’re lucky that day), RAIN. It’s been humid for a couple of weeks, but the first rain only arrived last night, washing the dust off the trees and giving the seeds of monsoon wildflowers a wake-up call, though we won’t see them for awhile yet. In the encinal, the grassy evergreen oak woodlands on the lower slopes of southeastern Arizona mountains, one wildflower arrives early, as a harbinger of the monsoons: Jatropha macrorhiza appears as the clouds gather, and the first blooms open before the rains begin. This plant has no good common name. It is a perennial herb that sprouts from a huge brown potato-like tuber. The tuber stores winter rain like a cask, and replenishes its store during the monsoons, after flowering. It is common in a narrow elevation range in southeastern Arizona, but found in only a few localities in Texas and New Mexico, perhaps because it is so dependent on Arizona’s unique biseasonal rainfall pattern. The plant is in the Euphorbiaceae or Spurge Family, which isn’t obvious until you look at the seedpods. Southern Arizona’s other Jatropha species, J. cardiophylla, is a small woody shrub with heart-shaped leaves that is mostly confined to lower elevations in the Sonoran Desert, thought the two plants may occasionally grow side by side in the Empire, Rincon, and Santa Rita Mountains. I took this photo today in the Sierrita Mountains:

Jatropha macrorhiza
Another photo from the Sierritas, a small mountain range almost entirely covered in oak woodland. I took this one last weekend. It is Arizona black oak or bellota, Quercus emoryi, with a blooming Agave parryi flowerstalk. You can see a bluish-gray agave leaf rosette (not the one that is blooming) near the bottom of the photo. The “grass” at the bottom of the picture is Nolina microcarpa (called sacahuista, beargrass, or nolina), which is not a grass at all, but a relative of Agave and Yucca.

Agave and Oak in the Sierrita Mts.








