Biome: Dry Shade

Helleborus and Camellias live long lives in dry shade.

Dry shade offers a particular challenge to PNW gardeners. In fact, it can be the hardest location to satisfactorily grow plants. Many gardeners have dry shade, a tall canopy of Douglas Fir or Oregon White Oak or even neighborhood street trees  that can conspire to rob plants not only of light but water as well. And to complicate matters, the more you irrigate dry shade near trees the more tree roots you get and the more competition for your lovelies. The solution is to depend on plants that have these three adaptations:  dry tolerance,  root competition, low light conditions.

We’ve amassed a list of plants that really will thrive in these conditions. A good deal of these plants are native to the forest understory in Asia, they are built for serious competition with Bamboo. Many of our very best dry shade plants are from the Pacific Northwest and already inhabit dry woods. Invite these plants into your garden, they play an important role.

Prepare the soil as you would any rich perennial border. Add and incorporate compost and mulch. Give each plant a handful of all organic fertilizer to speed root growth and establishment and water faithfully for the first season.  In these conditions an annual application of mulch is not obscene and will reap great rewards. In time you can water much more infrequently.

Climate Adapted Plants for Gardeners in the PNW

Camellia x saluenensis ‘Magi’s Mystery’ ‘Apple Blossom’

Our friend garden designer plantswoman extraordinaire Magi Treece spotted this Camellia and observed it over time. I too had noticed it around town- always large and VERY old. Its most conspicuous trait is to produce simple single fluted ivory flowers from pink buds. Up close these 3″ wide flowers have a decadent sweet scent. Its appearance is most like the species Camellia cuspidata which is a very cold hardy species known for its fragrant white flowers. Blooms appear from December (Often as early as November) and open until the end of February. The elegant flowers are tough and it takes some serious weather to impede or even damage the flowers. Deep green leaves are long and thin and very glossy/handsome with a sharp tip. The entire plant is good looking at all times. Ancient varieties around town are upwards of 15′ tall and 3/4 as wide. I’d say it would be an 8′ x 8′ shrub in 10 years. Regular water speeds growth and assists in bud set for the following season, this is only important in summer. Excellent specimen or hedge. This is one tough and beautiful Camellia.  Dig a large hole to disturb the soil around the planting site and set the plant in the hole even with the soil horizon. Backfill, water and mulch. Magi queried Camellia Forest about this plant with no luck. I queried Nuccio’s and their best guess was that it was a form of C. cuspidata or a hybrid close with it. Either way its one of our most favorite Camellias and we have our sweet friend Magi to thank. This Camellia looks and acts very much like an evergreen Magnolia and it could be used as a smaller substitute. The flower fragrance on warm days is a bit like a Gardenia. Moderately fast growing.

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Camellia x williamsii 'Buttermint'

Camellia x williamsii ‘Buttermint’

Unusual, profuse and a great color for a Camellia, ‘Buttermint’ produces fully double, but small flowers that deck all the stems for months in mid-winter to spring.The flower color is elusive with warm tones of light yellow on the interior fading to a bone color farther out on the petals.  Moderately fast growing evergreen shrub to 6′ tall and 4′ wide in full sun- but not reflected heat, part shade to quite a bit of shade. Regular, consistent summer irrigation for the first few years to establish. Older plants can get by without summer irrigation- but bud set and flowering is improved with such. The flower color is aptly described by its name. Pale yellow to buff to off white as they unfurl. Flowers do not turn brown and cling when spent instead they drop cleanly so in bloom there is a uniform fresh appearance. Long lived shrub that grows about 1′ a year when young. Give it room in time. Exquisite winter blooming companion for Hellebores, Grevilleas, Iris lazica, Iris unguicularis. Small glossy deep green foliage is fetching year round. Sets many, many flower buds in autumn.

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Camellia x williamsii 'Little Lavender'

Camellia x williamsii ‘Little Lavender’

Interesting, hardy, and very bloomy Camellia that enchants us with anemone style flowers with a distinct lavender cast. Upright growing shrub to 8′ tall by just 3′ wide in 7 years. Glossy foliage looks good year round. Full sun to quite a bit of shade. Regular water to establish then deep and sporadic during summer.  Excellent skinny Camellia for tight quarters. Takes quite a bit of summer drought when established. Excellent tolerance of sub-freezing wind and this upright plant would make a showy hedge or screen. Little pruning needed. Flowers shatter cleanly, never clinging and discoloring- one of the best traits of any Camellia. The lavender hue of the flowers is most pronounced in full sun. The ‘Little’ part of the name refers to the size of the adorable flowers which appear en masse February-March.

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Camellia x williamsii ‘Night Rider’

One of the very best of all Camellias. This remarkable hybrid bears small semi double black/red flowers with petals that have a glossy rubbery quality. The thin foliage is deep green black as well and new growth is brilliant red before settling down. Slow growing shrub for shade to full sun to 6′ tall by 4′ wide in 8 years. Regular summer water speeds up the growth rate. Otherwise light consistent summer water is recommended. There is so much of the chemical that makes up the hue red that even the roots are brilliant blood red. Handsome at all times and cold hardy. Not an easy Camellia to produce in a container- easy and adaptable in the ground. Blooms late for a Camellia- March to April.

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Camellia x williamsii 'Waterlily'

Camellia x williamsii ‘Waterlily’

Extraordinary hybrid that combines all the great attributes of a Camellia with larger, more dramatic flowers and more of them. It also possesses excellent cold hardiness as well as garden adaptation. Large growing glossy evergreen shrub with fetching deep green leaves. In late January to early March- and often longer than that depending on the weather 5″ flat fully formal double clear pink flowers are stunning. You really have to see them up close to get a handle on the size and perfection of each flower. Upright growing shrub to 9′ tall by 7′ wide in 10 years. Full sun to quite a bit of shade in well drained soil that retains moisture. Light consistent summer moisture aids establishment and also increases the amount of flowers the following season.  Established plants can endure quite a bit of drought. Exceptional cold hardiness, slightly below 0ºF. . Flowers shed cleanly- they shatter without clinging and discoloring. Excellent candidate for a large espalier. Exquisite large shrub.

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Cardamine trifolia

Cardamine trifolia

Don’t let this cute little demure ground cover fool you. This is one tough little plant. An evergreen mounding perennial that throws up 6″ clouds of white flowers in very early spring. So fresh and welcome along side other early bloomers for part shade to shade. Very slow growing to 1′ wide for rich, well drained soil with regular summer water. However, if you skip watering this little gem no harm will come. Incredibly drought adapted. I mean withering drought. And it may wilt a little but it seems to recover from just about anything. Deep green leaves. Bait for slugs if needed.  SE Europe.( kar-DAM-ih-nee )

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Carex pansa

Carex pansa

California meadow sedge is native to stream banks, and vernally wet places at the beach from British Columbia south in to Baja. A deep green winter growing sedge which each plant reaches about 18″ across and 10″ or so inches high. It flops over gracefully and has a very uniform appearance through the year with light irrigation. This is a winter growing plant that resumes growing and greens up with winter rains. In very cold weather (below 20ºF) it can take on russet tints. A FANTASTIC LAWN SUBSTITUTE where it has been used extensively for that application in California. We should use it here too. Plant on 1′ centers for a lawn (faux lawn) cover from one gallons and water regularly through the first season. No water plantings can go summer dormant but in wetter environs this can be avoided and it will remain green and verdant. Water once a week in summer to remain green.  Fantastic ground cover, slope cover as it will out compete weeds and form a uniform cover. Tolerates clay soils well, but some amending will reap rewards with a faster growing plant. Tolerates mowing very well. Oregon native plant. 

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Carpenteria californica

Carpenteria californica

Bush Anemone is a locally rare native of the Sierra Nevada foothills in Fresno County in central California. This tough evergreen shrub with thin deep green leaves set against pale exfoliating glossy bark is perfectly hardy to cold and drought. In May/June 3″ wide pure white flowers with a central yellow boss of stamens are sweetly fragrant. Full sun to almost full shade in any soil with adequate drainage. Adaptable to dry clay soils and able to endure extreme drought.  Extraordinarily  climate adapted- enduring summer drought and winter rain. Appreciates good air circulation. No crowding. To 8′ tall and 5′ wide in 6 years. Often left alone by deer- but they will definitely try newly installed plants.  One of our most treasured west coast native shrubs. Very long lived sited correctly and denied summer water. Accepts blasting reflected heat. In time you can limb up the shrub to reveal the white/taupe exfoliating bark which appears glossy with age- this also assists in the air flow that this shrub craves.  A monotypic genus. There’s just one species. Limited quantities.

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Carpenteria californica ‘Elizabeth’

A wonderful selection of Bush Anemone that was chosen because it produces more flowers (though they are a tad smaller than the species) born in multiple sprays. And this form is slightly more compact as well. An evergreen shrub with lanceolate leaves w/ a rolled margin (revolute).  The deep green leaves are attached to tan stems and trunks that with age exfoliate to a glossy metallic sheen. To 6′ tall by 4′ wide in 5 years. Full hot sun to very light open shade in average, well drained soil. For clay soils its best planted on a slope. Water to establish then none after the first summer- in fact this extremely drought adapted shrub prefers to go with out water. Provide good air circulation. Adaptable to the hottest sites, including western and southern exposures. Moderate deer resistance- they will try young plants so protect them. Long lived, climate, adapted shrub. Cold hardy to about 0ºF. The white  flowers that occur in May/June are sweetly fragrant. Prune, if needed AFTER flowering.

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Ceanothus cuneatus ssp. cuneatus ‘Mary’s Peak’

This is a different form of our locally native Buckbrush. We found this at approximately 2200′ on Mary’s Peak in the Coast Range in a forest that was comprised primarily of Douglas Fir  and Golden Chinquapin. This shorter shrub with smaller deep green leaves is most conspicuous in its slick gray stems. To 3′ tall by 4′ wide in 5 years. Full sun and average to poor soil. Blooms April to May with ivory colored panicles that cover the whole plant on old wood. The sweetly fragrant flowers are always buzzing  with pollinators. A true low water shrub that can easily get by on only what falls from the sky, once established. This is a cold hardy and locally  native evergreen shrub. Often it grows in an arching and then angular kind of way. This form is less upright. Red seedheads follow the flowers. This is a very well known and stable population in the wild that is regenerating nicely.  Extraordinarily tolerant of heat and drought. Traditionally this shrub follows disturbance and was widespread in the Willamette Valley often as a meadow component with Rosa nutkana and  Amelanchier,  Excellent with native clumping grasses, perennials, and annuals.  Oregon native plant.

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