The eastern, lower elevation section of Joshua Tree National Park
is generally emptier than the west, with few or no Joshua trees; the scattered vegetation is mostly cacti and small bushes, since the land is part of the Sonoran Desert rather than the Mojave Desert. Trails lead to summits, old mines and palm oases. Pinto Basin Road crosses from north to south, exiting the park near Interstate 10 (exit 168), but most of the eastern section of the preserve is essentially roadless, and rarely visited.
Cholla Cactus Garden
Half way along the main road across Joshua Tree National Park
, the Cholla Cactus Garden
(elevation 2,160 feet) marks the approximate boundary with the Sonoran Desert, which is hotter and has less rainfall than the Mojave. Although teddy bear cholla (cylindropuntia bigelovii
) are widespread across desert regions of Arizona and California, this location has a particularly dense collection where the plants grow very close together, almost to the exclusion of all other species - only the occasional creosote bush or echinocereus
are also seen. A quarter mile loop trail winds through the cholla, whose long spines show a range of colors from cream-white on the newest growth to brown and black on old or dead specimens. Many fallen pads litter the ground, creating a potential hazard when walking, as they will attach themselves to skin or clothing at the slightest contact. Two miles west of the cactus garden, a roadside pull-out marks the start of the mostly off-trail walk to Silver Bell and El Dorado mines
Panorama of the Cholla Cactus Garden
East of the cholla, at lower elevations, ocotillo plants are quite abundant, but generally from here to the south entrance vegetation is sparse and there is not much to see. The scenery is impressive enough though no different to dozens of other desert mountain ranges in south California and neighboring Arizona. About one third of the national park lies away from the highway even further east, containing the flat Pinto Basin and the remote Coxcomb Mountains - and is an officially designated Wilderness Area. This land is traversed by only a few, low quality, dirt roads, which lead to abandoned mine workings and water wells. The dominant plant is the ubiquitous creosote bush, widespread across all Southwest states - these plants grow at quite widely-spaced intervals to make best use of the scarce water, giving the landscape a uniform, specked appearance from afar. Just beyond the southeast park boundary, in the Eagle Mountains, a recent agreement has given the go-ahead for construction of what may become the world's largest landfill site, despite much opposition from local conservation groups.
Close to the south entrance, the one main location of interest in the Sonoran Desert section of the park is at Cottonwood Spring
, site of one of Joshua Tree's six fan palm oases, near which is a campground, ranger station, visitor center, picnic area, nature trail, an old gold mine on Mastodon Peak, and the start of a 4 mile path to the Lost Palms Oasis
. Beyond this maintained trail are rougher routes to the two most remote oases in the park, at Victory Palms
and Munsen Canyon
. The final few miles of the Pinto Basin Road descend through the narrow Cottonwood Canyon
between the Eagle & Cottonwood mountain ranges, ending at exit 168 of I-10, though another road continues southwards through Box Canyon
towards Mecca and the Salton Sea
. Just south of the interstate, the unpaved Pinto Road
provides some nice places for free camping, far enough from the highway for a quiet night's sleep.