Compact and very flowery this form of the dependable Abelia fits into smaller areas and perfumes the late summer to autumn gardens with masses of small white flowers. To just 4′ x 4′ in 7 years for full sun to light shade and most soils. Drought adapted when established, it will also accept regular summer irrigation. Slow growing and cold hardy evergreen. Following the massive bloom, the calyx of each flower remains and turns madder red. A second season of showiness that persists as a red glow through winter. This dense shrub retains its good looks for year without needing much pruning. Pruning should be done in early spring. Blooms on wood from the current season.
Biome: Hot Aspects
Its surprising in our climate that heat is as big of an issue as it is. But there are scores of sunburned and toasted plants littering our city by the end of summer. We average just 2.o” of rain during June-August and you have to take into account reflected heat. That could be heat emanating from an asphalt street such as occurs in a hellstrip or the accumulated heat of a hot wall. Both can conspire to fry plants. Luckily, we grow a LOT of plants adapted to excess heat. These plants won’t fry on the first day above 95ºF. Some plants revel in reflected heat, they come from hotter climates and need warmth to both bloom and to ripen wood for winter. That means it receives enough heating calories to ensure winter hardiness. Currently, Portland averages 14 days above 90ºF per year. By the next decade that number will have more than doubled. Part of gardening with climate change is to anticipate those effects and adapt to them. Increasingly, we will be considered a hot summer climate. We should garden accordingly.
Climate Adapted Plants for Gardeners in the PNW
Abutilon (Callianthe) ‘Nectarine’
One of our very finest Flowering Maple selections. Relatively large pendulous flowers are soft citrus yellow/orange with darker red veining. As this variety blooms out the flowers expand and the petals reflex upward, a very charming look. Vigorous and surprisingly cold hardy Abutilon. To 4′ x 4′ in a season. Rich soil that drains with REGULAR H20. During the growing season Flowering maples very much appreciate at least one application of all purpose organic fertilizer to enhance vigor and blooming. Easy to grow in containers where it will likely perform as a tender annual. In the ground it is different. By the end of winter the plant will look absolutely horrible sticks and maybe a few pieces of tattered dead leaves. The secret to the spring resurrection is to water heavily and consistently until you see new growth. Then you can let the soil dry between irrigation. Loved by Hummingbirds and birds in general. Grows very fast in the correct conditions. Blooms June to October.
Xera Plants Introduction
Abutilon (Callianthe) megapotamicum (a) ‘Marianne’
Improved selection of the Chinese Lantern Plant- which is actually from South America, and this form has larger more flared yellow petals. They extend and recurve from the bold red calyx. This arching multi-stemmed shrub blooms almost non-stop from June to frost and often longer. Vigorous to 6′ tall and 4′ wide forming a large patch in time. The arching thin stems and skinny pointed leaves display the rows of flowers perfectly. A hummingbird delight. One of the hardiest to cold this behaves as a sub-shrub in the coldest winters- freezing back but returning boldly from the ground when the soil warms. Most winters, damage is restricted to burned tips and the majority of leaves which will drop. Plant with the base in a protected location- for instance between low shrubs to protect the crown, or near the base of a wall. Mulch if arctic (below 20ºF) weather threatens. Following a freeze the plant will look absolutely awful. Refrain from cutting it back until you see new growth emerge- either from the base or vertical stems. In any case water it consistently and heavily until you see vigorous new growth- the transformation with regular water is remarkable. So, don’t by any means give it up for dead. Full sun to quite a bit of shade. A bit tall and lanky for containers- just plan for this. Rich, WELL DRAINED soil improves both cold hardiness and speeds recovery. Excellent performance at the Oregon Coast.
Abutilon (Callianthe) megapotamicum (a) ‘Red’
Everything about this form of hardy flowering maple is identical to the species except the molten red flowers with deeper veins shot through. The 2″ pendant flowers appear from May to October on a large growing sub-shrub. To 6′ in a single season It makes rapid growth as temperature rise above 70ºF. Full sun, in a protected location in rich soil with regular summer irrigation. Abutilons look absolutely horrific in spring even after a normal winter. Expect this. The solution is to water, water, water especially as the temperatures rise. It blooms on new wood and flowers are continuous as the shrub grows. Mostly deciduous but it can be evergreen at the coast or in protected places in mild winters. Loved by hummingbirds who are lured by the lurid red flowers filled with nectar. Cut back by 1/2 after all danger of frost has passed. Supply a handful of all organic fertilizer and water faithfully. Excellent performance at the Oregon coast. Inland it is best with the protection of a shrub covering its roots so that the soil does not freeze. In this situations it can live even thrive for many many years. Mulch with compost. Native to the mountains of Brazil. Root hardy to about 10ºF. Long lithe stems can be woven through a fence or a lattice.
Acacia covenyi
An exciting shrub/small tree with paddle shaped blue evergreen phyllodes for foliage and in late winter to early spring a massive display of luminous yellow flowers. I’ve always loved Australian wattles so it was with great excitement that we decided to grow this striking plant. Moderately fast growing to 16′ tall and 8′ wide forming either multiple or a single trunk. The bark is chocolate brown and smooth. Very few Australian Acacias will thrive in Portland, its just about 5 degrees too cold in our coldest years. This one is different, (a few species will live for 4-6 years before they finally succumb to Jack Frost. Acacia pravissima etc.) This, however, is the cold hardiest that we have grown. It is hardy to just below 10ºF for brief stints- good enough for long term survival. This is a rare limited endemic to the high mountains of New South Wales but is popular as a garden subject the world over. The small, fluffy, balls of electric yellow flowers foam among the blue leaves – incredibly pretty. Full sun and a protected location – against a south facing wall is ideal for a very pretty fun to grow tree. Once fully open the flowering stems may be cut for long lasting bouquets. Blooms on wood from the previous season, prune if needed after flowering has ended. Light consistent water to establish . Not fussy about soils and happiest in full, all day sun. Protect from subfreezing east wind. Bloom time is concurrent with several earlier Ceanothus (‘Blue Jeans’, ‘Dark Star’, ‘Concha’) and creates a vivid early spring yellow and blue display not soon to be forgotten. Drought adapted when established. Not bothered by deer/elk- not entirely sure about rabbits- if they are profuse in your neighborhood it wouldn’t hurt to protect the plant with chicken wire when young. Beautiful year round and spectacular in bloom. AKA Blue Bush.
Acanthus syriacus
Outrageous Bear’s Breeches for hot and sunny aspects. Forms large rosettes of spiked intricate leaves that almost lay flat on the ground. In summer, enormous chalice-like soft purple blooms rise to 2′ tall. Each flower opens to reveal yellow petals. A beautiful combination. Full sun and rich, well drained soil with light summer water. Give this plant room and air circulation. It does not like to be crowded. Fully cold hardy and completely winter deciduous. Established plants can get by on less water. Moderate deer resistance. To 2′ wide in several seasons. Spectacular cut flower.
Achillea millefolium
This is the green foliage form of our wild yarrow. A rambunctious, easy to grow evergreen perennial for rough sites in well drained soil in full sun. Continuously from spring to autumn ‘umbels’ of pure white flowers rise 18″ above low spreading aromatic, finely divided ferny foliage. Most often it is green with variants that have gray foliage from time to time. Low water perennial that can even be used as a lawn substitute. A single plant spreads to several feet wide. Moderate deer resistance. Butterflies oh the butterflies.This is a pioneer perennial and will often out compete less robust native perennials. Its best use is as a contained weed. It is great for pollinators Individual plants rarely persist more than 3 years. Oregon native plant.
Achillea millefolium ‘Pretty Woman’
Of all the selections of our native yarrow this stands out for many reasons. The ‘umbels’ of flowers are a rich red which holds the color for an extended period. It fades only slightly to a rust red with time. Its vigorous and easy to grow. And it re-blooms reliably if spent flowers are removed. All the way until frost and sometimes longer. A very, very good long-lasting cut flower. To 18″ tall forming spreading colonies. Semi-evergreen. Low water when established in well-drained soils. Excellent to moderate deer resistance. Appreciates an annual application of compost. Oregon native plant.
Achillea millefolium ‘Willamette Gray’
Greg got seed of this distinctive form of Yarrow near Oregon City. Unlike most garden varieties that are derived from European stock which very much appreciates rich soil and regular water to perform and those forms are also not pungent. We wanted our locally native yarrow that is incredibly durable, has gray foliage that is pleasantly aromatic with broad white flowers. This is a much more climate adapted perennial. Its found throughout all of the state, and can be found anywhere from meadows to surprisingly deep woods. This is a very thrifty plant and once established it really doesn’t need supplemental summer water. Spreads to form finely divided low gray foliage. The flat umbels of pure white flowers are very large and this is a landing pad for all pollinators as well as butterflies. To 20″ tall in bloom. Excellent meadow component with clumping grasses, annuals, and bulbs. A great plant for hell strips and hot aspects too. Very easy and forgiving perennial. Blooms May-August. Mostly evergreen save for the very harshest winters. Not bothered by deer. Oregon native plant.
Xera Plants Introduction
Achillea sibirica
A wonderful relatively new Achillea (Yarrow) from Siberia. It brings not only larger chalk pink flowers in bold umbels it is cold hardy to USDA Zone 2. This plant will never freeze out. Forms expanding clumps with upright stems clothed in glossy long green leaves with small teeth. On 22″ stems umbels of flowers appear from May to August. After the first flush of flowers shear away and water and another round will commence. The long stems make great long lasting cut flowers too. Loved by a bazillion pollinators, hover flies, bees of all kinds swarm the flat landing pad. Full sun to very light shade in rich, soil that drains. Incorporate some oxygen in by double digging. Good companion plants are Agastaches and Penstemons as well as ornamental grasses. Completely deciduous in winter. Light consistent summer H20 to establish. Long lived perennial. Moderate deer resistance. Elegant perennial. Siberian Yarrow.
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