Japanese Maple are among the most graceful, elegant small trees to adorn any landscape. Their heavily serrated leaves evoke a tropical feel, with leaf color ranging from bright green to deep burgundy. Their many varieties can take various forms, from shrubby umbrella shaped weeping forms to upright vase shaped overarching canopies. Obviously at home in a Japanese garden, they have a place in any yard whether providing a focal point for a water feature or welcoming guests in an entryway.
Unfortunately, Colorado is far removed from their island homeland, where the trees are bathed in tropical breezes and humid fog. Colorado soil is devoid of organic nutrients and beneficial microorganisms. Our dry air and intense sunlight a mile up in the air suck the moisture right out of their delicate leaves. Wild temperature swings and hard freezes are often the death knell for these tender garden elements.
You might find success in protected sites in shady areas of downtown Denver with good soil in sheltered neighborhoods. I have tried and failed three times to nurture Japanese Maple to establishment in the Denver Highlands. While they can grow here in some microclimates, they are not a viable tree for most of the Front Range. Fortunately, there are a few plants that can substitute for Japanese Maple where a conversation piece or an unusual highlight is desired.
Cutleaf Sumac is an often overlooked plant with shaggy, serrated leaves and explosive red-orange-yellow fall color. They thrive in our arid environment even in poor soil, and actually prefer it on the dry side once established. Usually available only as small container shrubs, it may take a few years to develop into a glorious multi-stemmed large shrub or small tree, but they grow very quickly and can be selectively pruned to achieve almost any desired form. Admittedly, they present as an anemic twiggy plant in the garden centers, I think because they like it dry but need to be watered every day to keep them alive in the containers. With a little patience and selective pruning and care, your friends will be amazed by the wildly extraordinary plant you cultivated for your garden masterpiece. But beware, Sumac are thicket forming and can self-sow, so some maintenance may be required to keep them in check.
Elderberry are native to Colorado and hybridized forms may rival Japanese Maple for their leaf form and color! Consider Black Lace Elder, with burgundy, almost purple finely serrated leaves. They look more like plants you would find in Florida or Hawaii, but they’re right at home in the Colorado High Country. In Portland, these plants will grow over the roof line, but expect more like five to ten feet in our less than desirable growing conditions. Again only available as container shrubs, give them a couple of years to provide that “wow” factor, but savor every moment of anticipation as they evolve. These too can be shaped and trained into small trees, and actually will respond well to a good haircut in late winter, reviving them and causing a flourish of new bright green growth above a deep purple base. Bonus points, they produce lacy white flowers in June for a pop of late spring interest!
If you’re looking for a larger tree in your landscape, but want something that maybe reminds you of your vacation in Tahiti, check out Golden Raintree. Perfectly suitable for our harsh climate, Golden Raintree is a fast grower reaching about 30’ tall. Their serrated bipinnately compound leaves will have you thinking you’re in an Asian jungle. Perhaps best in the multi-stemmed form, they’re perfect for shading your deck or patio. Panicles of bright yellow flowers shower the tree in mid-summer, hence the name! Summer flowers, and especially yellow flowers, are rare. These trees will stop traffic if planted in the front yard! But the show’s not over, flowers are followed by puffy, papery seed pods, often compared to Chinese lanterns, and not considered messy by any means. Perfect for uplighting as the light can penetrate well up into the overarching canopy, dump your Japanese Maple and plant Golden Raintree!
Just because a tree is sold here doesn’t mean it will grow here. If money isn’t an issue and you have a high risk tolerance, then by all means give Japanese Maple a shot. Heck, I recently noticed one doing quite well in the Back Country in Highlands Ranch, where they have no business succeeding. Granted it was against a north facing wall in a raised planter with good soil in a protected spot, but I’d say they got lucky. You can achieve that Japanese Maple look with the above recommendations, and compliment with Fernbush, Fine Line Buckthorn, and Scarlet Yucca to complete the effect.
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