Ohio is the Buckeye State. The Ohio buckeye that is native there must be very special. Perhaps all other trees that are native to Ohio are just not very uninteresting. Whatever the situation, I sort of believe that the Ohio buckeye is more appealing in some regards than the California buckeye that is native here. However, the California buckeye might be more weirdly interesting.
The main reason that California buckeye is not popularly used in landscapes is that it is ‘twice deciduous’. That means exactly what it sounds like. Just like other deciduous trees, it defoliates in response to cooling autumn weather, and refoliates in response to warming spring weather. Unlike other deciduous trees, it repeats the process through the warmest weather of summer.
When summer weather gets too warm and arid, the foliage of California buckeye shrivels and sort of defoliates. Without rain to dislodge the shedding foliage, it can linger and look shabby for quite a while and maybe until it is replaced by secondary foliage that develops as the weather mellows. The secondary foliage does not last long before it is time to defoliate again for autumn!
California buckeye is not often planted into landscapes because it really does look like the living dead through summer. It provides no shade when shade is most desirable. Those that I work with are only here in the landscapes because they grew from self sown seed that sneaked in on its own. Some will be subordinated to more desirable adjacent trees, although there is no rush.
I happen to like California buckeye. Except for the rarely seen red horsechestnut, it is the only species of buckeye that I am familiar with. Bloom is neither colorful nor reliably profuse, but is delightfully fragrant in close proximity. Not many natives are fragrant.
Most other specie of ceanothus are more colorful and tame than Ceanothus cuneatus is. It is known as ‘buckbrush’ because the abundant round trusses of minute flowers are typically dingy white instead of the more familiar shades of blue that have earned other ceanothus the common name of ‘California lilac’. However, a few wild plants and some garden varieties bloom blue.
Mature plants are at least six feet high and wide, but typically less than ten feet high and twelve feet wide. They are pleasantly fragrant as they bloom between March and April or May. Roots seem to tolerate almost any soil that drains well and does not get watered too much. Once established, no watering is needed. The scrubby evergreen foliage likes full sun exposure.
Although it is a bit unrefined, and does not want to be pruned for confinement, buckbrush works nicely as screening shrubbery on the perimeter of a landscaped area, or in unlandscaped areas. Newly installed small plants only need to be watered occasionally as they disperse their roots through their first year. Since they are native, established plants are satisfied with rainfall.
California is a big place, with more environmental diversity than any other state and most other countries. It includes rainy and cool forests of Del Norte County, and dry and hot deserts of Imperial County. The snowy mountains of Placer County and the mild coastal plains of Los Angeles County are here too. There are hundreds of miles of sandy beaches and big fertile valleys.
Consequently, plants that are native to California are just as diverse. Many that are very well adapted to the environments that they naturally live in are not so well adapted to other environments that may be only a few miles away. They really do not want to go to some of the more divergent climates in other regions.
Coastal redwood that is so happy within its natural range on the foggy western slopes of the coast ranges to the north are not so happy on the drier eastern slopes of the same ranges. It probably would not survive for long in the Mojave Desert. California fan palm from the hot and arid region of Palm Springs languishes on the damp and cool western edge of San Francisco.
Most of the popular California native plants are popular because they do not need much water, if they need any at all. However, some are as unhappy with local climate conditions as exotic plants from other continents are. For example, few plants tolerate drought as well as Joshua tree does. Yet, Joshua tree is likely to grow fast and then rot because winters are too damp for them locally.
Of all the excellent plants that are native to California, the most excellent for local gardens are either the few plants that are native to the local region, or the many others that are native to similar regions. They do not need cold Sierra Nevada Winters, hot Death Valley summers, Mojave Desert aridity or San Francisco fog. They are right at home here.
Even natives need some help adapting to a new garden. Confining their roots to cans while they grow in nurseries is very unnatural for them. Once planted, they will need to be watered while their roots disperse enough to survive on rainfall, or with minimal watering.
With so many exotic species to enjoy in our gardens, it is easy to miss what might be growing wild just beyond. Silk tassel, Garrya elliptica, is endemic to coastal slopes within thirty miles of the ocean, between San Luis Obispo and Newport in Oregon. Yet, it seems to be more popular abroad than it is here at home. It is more adaptable to refined landscapes than most other natives are.
Silk tassel is more tolerant to supplemental irrigation than most other species from the same region are. It actually prefers to be irrigated at least occasionally through summer, particularly in drier and warmer climates. However, as a native, it is resilient to lapses of irrigation too. If necessary for form or confinement, awkward and obtrusive stems can be selectively pruned out after bloom.
Long and elegantly pendulous catkins of tiny pale grayish white flowers bloom late in winter or early in spring. After bloom, dried catkins linger prettily into summer. Garden varieties are male, with longer blooms. ‘James Roof’ can produce catkins nearly a foot long. Female plants in the wild bloom with shorter catkins. Glossy evergreen leaves are two to three inches long with wavy margins.
Native plants should be the most sensible options for local landscapes and home gardens. It seems natural that they would be the most sustainable, since they survive in the wild without watering, soil amendment or fertilizer. Once established in landscapes, they should be satisfied with the moisture they get from annual rainfall. Plants that are not native are considerably more demanding.
However, even native plants are not perfect. Some of the same qualities that help them survive in the wild are not so desirable around the home. To make matters worse, adapting to unnatural landscapes and home gardens can be as difficult for native plants as it would be for many of the common exotic (non-native) plants to adapt to the natural climate and endemic soils without help.
Natives obviously do not need much water. They certainly do not get much in the wild. They are resistant to drought because they disperse their roots so efficiently. The problem with this technique is that it does not work while plants are confined to cans (nursery pots). Once planted, new plants might take a bit of time to disperse their roots enough to survive without supplemental watering.
This might not seem like much of a problem for those who do not mind watering new native plants while they get established. New native plants still use less water than established exotic plants. The difficulty is that too much water can rot roots before they disperse! So, new native plants need to be watered regularly, but also need to not be overwatered! Monitoring them can be a hassle.
It might seem that larger new plants would be more resilient than smaller plants would be, but it is quite the opposite. Smaller plants (such as #1 or 1 gallon) disperse roots more efficiently, so get established sooner than larger plants (such as 5 gallon). Roots contained within small volumes of media (potting soil) are damaged less when planted than roots in larger volumes are. Roots of native plants, although efficient at dispersion, are innately sensitive.
Botanists took a while to contrive an identity for toyon, which is also known as Christmas berry and California holly. It was classified as a species of Crataegus, two different specie of Photinia and two other specie of Heteromeles before it was finally identified as Heteromeles arbutifolia. Meanwhile, the town named after it changed its name only once from Hollywoodland to Hollywood.
Toyon is native to the coastal chaparral regions of California and Baja California, as well as British Columbia, so it can be quite happy with minimal watering or none at all in home gardens. Too much water is likely to rot roots. Fire blight unfortunately seems to be more of a problem in refined landscapes than it is in the wild. Toyon can be pruned up as a small tree, but must not be shorn.
Where it competes with other trees, toyon can get more than twenty feet tall. Those that are well exposed are typically less than twelve feet tall, with nicely well rounded canopies. The evergreen leaves are somewhat serrate and narrow. Fluffy trusses of small white flowers bloom early in summer. Big hanging clusters of bright berries ripen in autumn and linger until birds eat them in winter.
Is it really supposed to be the bane of fleas? If so, why? I learned it as Santa Barbara daisy. Is it native there, or was a particular variety of it named for Santa Barbara? Is it a weed? Is it native? Is it a native of somewhere else in California that merely naturalized here? There are so many questions about this simple little flower that is growing wild under a cyclone fence at the backside of a motorcourt at work.
Whether it really is native or not, or whether it is a straight species or a selected variety of one, fleabane happens to do well in drought tolerant landscapes composed of native plants. It naturally spreads out to form shallow but wide mounds. If it gets cut back in its off season, it comes right back. Although it dies after only a few years, lower stems typically form roots and grow into new plants before the original one dies, essentially replacing itself before anyone notices.
If it is a weed, it is polite about it. Stray plants that appear where they are not wanted are easy to get rid of, and do not regenerate too aggressively to be managed. Those that happen to appear in out of the way situation can be left to bloom without much concern of profuse seed dispersion. Weed or not, it is preferred to other nastier weeds that it might prevent from growing simply by occupying the space.
In the west, the incense cedar, Calocedrus decurrens, was made into cedar chests or paneling for cedar closets as a substitute for the more traditional Eastern redcedar (which is incidentally a big juniper). The wood is supposedly aromatic enough to repel moths from woolens and furs. The evergreen foliage is very aromatic as well, so is sometimes used for garlands at Christmas time.
Old trees in the wild can eventually get nearly two hundred feet tall, with somewhat narrowly conical canopies. Yet, hundred year old trees that were planted in urban gardens during the Victorian period are not half as tall yet. Some are quite narrow. The rusty brown bark is deeply and coarsely furrowed. Branches can sag downward and curve back upward, which looks rather disfigured. Flattened sprays of scale-like leaves resemble those of arborvitae. Incense cedar is native to the Sierra Nevada and Cascade Mountains.