Manzanita and Hollywood Canyons demonstrate the ability of nature to thrive in disturbed areas and neighborhoods. Not only are these canyons necessary habitats for native flora and fauna, they also act as windows into San Diego County’s natural environments. Both canyons connect to commonly used parks that provide a corridor to these natural worlds, easily accessed by the community of Azalea Park, which has taken action over the years to sustain an accessible native habitat through decreasing human homesteaders and potential fire dangers. In that action’s wake, a thriving canyon community of birds, mammals, reptiles, insects, and plants have continued to contribute to necessary green belts and to our understanding of natural connectivity.
Azalea Community Park is a great starting point for this urban canyon loop. Well maintained facilities and a community center hide a kids’ playground and basketball court. Just beyond this, hikers approach a grassy slope downward to a eucalyptus stand and a few pine trees to the right. The trail begins just past the pines, veering to the right toward the I-15 freeway. It narrows before banking right along a fence separating the trail from freeway access. A short incline ends just before a steady descent along wooden stairs heading to the canyon bottom. The path down is bordered on the right by common chaparral plants, such as chamise (Adenostoma fasciculatum), California buckwheat (Eriogonum fasciculatum), and wart-stemmed ceanothus (Ceanothus verrucosus). Once at the bottom, the trail opens up to expose the west drainage site of Manzanita Canyon.
Caution is advised from this point forward as loose river rock makes up many parts of the trail. The round rocks that compose the stream bed for the length of the canyon make the rating for this hike moderate. Also keep in mind that the canyons here are active drainages and will flow heavily with water during a rainy period. They are not hikable while it is raining.
The trail winds in and out of the dry creek bed, first passing a marked access path to 39th Street on the left, and a rest area further along under a large Peruvian pepper tree (Schinus molle), complete with benches made from fallen trees. Peruvian pepper trees are one of the many non-native plant species which have become naturalized. Some of these non-native species may outcompete established plant communities for resources. Invasive species such as iceplant, sweet fennel, and castor bean have been common in these canyons for some time. This trend is reversing, however, due to consistent community involvement.
Along the canyon sides, hikers may notice blue cylindrical cones covering small plants. The cones are used to protect these young native plants from becoming food for the common cottontail rabbit (Sylvilagus audobonii). In an effort to increase the native plant population, San Diego Canyonlands planted 716 native plants in the winter of 2016-2017 and have monitored their survival on a monthly basis since. Half of the natives have survived their first year in the ground, with 325 new native individuals planted in the 2017-2018 planting season. Many pre-established individuals of common chaparral and coastal sage scrub species are also present along the canyon bed.
Manzanita Canyon offers an excellent representation of the native habitats found throughout San Diego County. The plants that compose chaparral and coastal sage scrub communities have evolved adaptations to deal with the arid climate of Southern California and Baja California. Thick-leaved yerba santa (Eriodictyon crassifolium) can gather and retain substantial morning moisture with its thick fuzzy leaves that increase water-gathering surface area, while the folded taco-shaped leaves of laurel sumac (Malosma laurina) divert water downward toward the center of its stand and reduce heat absorption. San Diego mountain mahogany (Cercocarpus minutiflorus) is one of a few San Diego natives that can readily resprout from its root crown after a fire. Another prominent native plant, which this canyon is named for, actually requires fire to germinate its seeds. Unfortunately, according to local residents, there are very few of these manzanitas (Arctostaphylos sp.) left in the canyon due to a lack of fire events and competition from non-native plants.
Some native plant species are important food sources for resident birds in the area. The California towhee (Melozone crissalis) and northern mockingbird (Mimus polyglottos) will eat berries from toyon (Heteromeles arbutifolia) and lemonadeberry (Rhus integrifolia), which grow exceptionally well in these canyons. Two types of woodpeckers have been observed here as well, both of which can be seen with red patches on their heads. The acorn woodpecker (Melanerpes formicivorus) stashes acorns from Quercus species in trees and wooden telephone poles, while the beautifully patterned Nuttall’s woodpecker (Picoides nutallii) can be seen in neighborhood trees.
Many canyon birds are also present throughout the neighborhood among residences. A marked side trail through Jamie’s Way takes hikers back up to Manzanita Drive where bushtits (Psaltriparus minimus) and white-crowned sparrows (Zonotrichia leucophrys) may be seen. This trail is the first access point to the right and cuts the hike down to 1.7 miles, leading directly to Pepper Canyon via Jamie’s Way.
For a longer 2.3 mile hike, continue straight through Manzanita Canyon until the canyon opens into a street. A brand new educational venue for the community to the left, called The Ocean Discovery Institute, has just been built and marks the east end of Manzanita Canyon. This is a great place for kids to interact with and learn about our natural habitats. Follow a short switchback up the bluff to the right where the Manzanita Gathering Place is found. From here, follow Manzanita Drive for 0.3 mile until reaching the Jamie’s Way intersection. Turn left on Jamie’s Way and continue across Poplar Street to Pepper Canyon.
The short Pepper Canyon section, lined with mule-fat (Baccharis salicifolia), is intersected by a paved street, Pepper Drive. Cross the street and continue toward Hollywood Canyon via the trail entrance slightly to the right. The trail borders backyards and fences until reaching a staircase under the naturalized Peruvian pepper tree. Follow the sign at the bottom of the stairs toward Sumac Drive and Violet Street Trails. The creek bed trail along Hollywood Canyon is uneven and narrow at some points, so watch your footing along this section of the trail. This short path is lined with healthy lemonadeberry and holly-leaf cherry (Prunus ilicifolia) that provides shade for the native sunflower, goldenbush (Isocoma menziesii), and structure for a common native perennial herb that climbs the foliage of other plant, wild cucumber (Marah macrocarpa).