Episode Details

Autumn officially begins on Sunday. Fall planting season, however, is already here. The cooler air temperatures, combined with the still-warm soil, are the perfect growing conditions for a new plant. Increasing in popularity, thanks to increased production by wholesale nurseries and the plants’ needs for less water once established, are an increasing number of California native plants.

From the garden e-mail, Evan of San Jose, California wants to know about an evergreen tree or shrub that is native to coastal Southern California but does well in most mild coastal areas of the West Coast that stay above 20 degrees in the winter:

“I just ordered a Catalina cherry for my backyard,” writes Evan. “And I remembered that cherry trees need a pollinizing partner to produce fruit. Unfortunately, I can't find any information about which other cherry varieties are compatible with Catalina cherry. I was wondering if you could help me find a second tree to put in my backyard to pollinize the Catalina cherry. And I was hoping for more of an eating cherry other than the Catalina cherry. So, if there's a variety that my kids might like a little more that I can plant next to this one, I would appreciate it. This will be the first cherry in my backyard.”

The Catalina cherry (Prunus illicifolia subsp. ‘Lyonii’) is a California native shrub or tree, and it does quite well in coastal zones up and down the Pacific coast from San Diego to Seattle (Sunset Zone 5). And perhaps even a wider range. The “Sunset Western Garden Book” says the Catalina cherry’s progenitor, the Prunus illcifolia (the Hollyleaf Cherry), has a range from Sunset Zones 5-9 and 12-24, which would include areas ranging from the hot valleys of California into the Sierra foothills. The tree can survive cold temperatures down to about 20 degrees. I know that some of you like to experiment with growing species that are outside of your area’s normal plant palette. This might be one of them. But, as always, gardener beware. I hope you have more success with this than I had, attempting to get rhubarb seed to germinate.

Some specimens of the Catalina cherry on the coastal Southern California mainland tend to grow on slopes, and that might be a tip for where to plant it, in an area that gets good drainage. And cherry trees are notorious for needing good drainage.  

The Catalina cherry can be a tree or a shrub, because it only gets 15 to 20 feet tall, in gardens; but it can get twice that size in the wild. And, it is a true cherry, even though the dark red-to-black cherries themselves are not very tasty. Calscape.org, which is a plant finder service of the California Native Plant Society, says that “the fruit on the tree is best left for the birds” and parts may be poisonous. From Wikipedia:

The pulp of the (hollyleaf) cherry is edible.[4] However, the seeds of the hollyleaf cherry are considered to be toxic, and the plant must undergo certain leaching processes to make it safe for consumption.[24]Native Americans fermented the fruit into an intoxicating drink.[4] Some also cracked the dried cherries and made meal from the seeds after grinding and leaching them.[25] It has also been made into jam.[26]

The method of preparation for the cherry was to first extract and crush the kernel