This is the European subspecies selection of the very widespread Birch leaf Spiraea. This is a pan-global species at higher latitudes and it is represented in our local form (Spiraea betuifolia var. lucida) Varnished leaf birch leaf Spiraea. This is an immensely tidy and tough little deciduous shrub. It shows great drought adaptation, not needing supplemental irrigation after the first year. In summer clusters of white flowers with promenent petals as opposed to our form which lacks these. Also the stamens are much more restrained in this cultivar as opposed to our native variety. This makes the two easy to distinguish in bloom the native has furry white flowers and ‘Tor’ produces white petals. The clusters of flowers appear from wood of the previous season and completely obscures the foliage. Blooms for 4 -6 weeks May to early July. VERY compact to 2 ‘ x 2.5’ in 10 years. And it has very reliable and spectacular fall color with flaming red and orange leaves that persist well into late fall- this seldom occurs with our native subspecies. Very easy to grow in full sun, to light shade. Accepts regular water in summer but is consistently drought tolerant. ‘Tor’ is Gaelic for tight mound or hump. Excellent tough, elegant shrub. Mass for a tall ground cover. Plant with Sidalceas, Erygium, and verbena rigida.
Plant Type: Sub-shrub
Sub-shrubs are best thought of as woody perennials that can freeze to the ground in winter and regrow from the base in spring. Hardy Fuchsias and Abutilons are two examples of commonly grown sub-shrubs in our climate. The harshness of winter determines how sub-shrubs behave. In colder than normal winters (below 20ºF) they will likely freeze way back or to the ground. Mild winters may see no dieback at all. Refrain from cutting these back until you see new growth emerge- then you’ll know what to remove. Also, if an Abutilon has frozen back (and it will look awful and dead) simply water and water and water well into summer and the recovery that emerges is stunning. A little handful of all organic fertilizer in spring feeds recovery as well. For lightly tender sub-shrubs (zone 8a) and warmer it benefits these plants if they are planted deeply. Sink the crown of the plant 3″ below the soil level and mulch. This adds cold tolerance. Often slightly tender subshrubs will gain hardiness with age when treated this way.
Climate Adapted Plants for Gardeners in the PNW
Teucridium parviflorum
A stylish shrub/subshrub that is native to the drier parts of New Zealand, and offers great fine texture. The stems which are the only thing that differentiates this from the genus Coprosma- they are square. are golden orange woody stems that rise up to about 4′ tall by 3′ wide. Tiny round green leaves decorate these stems and in late spring and early summer small white flowers appear in the leaf axils. This plant can quickly return from the roots if chopped back severely or frozen to the ground. Established plants can regain their stature in several months. Average to enriched soil that is never boggy in summer. The fine foliage common adaptation in New Zealand, most likely the fine texture of the shrub was to foil grazing giant moa birds and other predators. Very good in containers ( it will be less hardy in a container as with everything) and it can be crowded heavily and still thrive. In the ground give it enriched soil and regular summer water for its first season. Let it grow as much as possible and develop a resilient root system- in the case of an arctic event it will be well prepared to regrow.. Mulch in fall for the first year. The luminous stems and see through appearance make it combine well with bolder textured plants. Regiar water in summer speeds growth and establishment the first year, in subsequent years it only requires irrigation once every two weeks. Freezes the ground at about 20ºF, returns quickly in spring when the soil warms. Not bothered by deer, not sure about rabbits. Excellent architectural plant. We took a break from growing this plant for years, we’re happy that its back.
Tibouchina urvilleana
Princess flower is a tender shrub that becomes a rapturous cloud of velvet purple flowers for all of summer. Three inch wide flowers have the wonderful backdrop of velveteen clad deep green leaves. To 4′ x 4′ in a seasonal container. Full sun to very light shade and rich soil with regular water. Appreciates a handful of all organic fertilizer halfway through the season. Over winter containerized plants in an unheated garage. Cut back hard, fertilize and place outside when all danger of a freeze has passed. In very protected gardens near the beach this shrub may be grown in the ground. To 8′ tall x 4′ wide. Freezes back below 27ºF and is root hardy to the low 20ºs. Mulch in autumn. Princess flower hails from the mountains of Brazil.
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