Spiraea splendens (densiflora)

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USDA Hardiness zone: Zn4b -20º to -25ºF

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Spiraea splendens (densiflora)

Subalpine Rose Spiraea is native to the higher elevations of the the Cascades. Above 4500′ in sunny, moist glens it makes carpets of deep rose pink umbels from low rounded shrubs. To 30″ tall by 4′ wide in garden conditions, Rich soil with regular irrigation. Moderately fast growing to this dimension. The emerging soft green leaves take on hints of blue as they mature. Bloom at low elevation is May-July but in its highest native haunts bloom can be delayed to late summer. Deciduous shrub with wonderful orange/ red fall color if brief. Easy to grow native garden plant with regular irrigation. Established plants can take deep watering every two weeks. Remember that this as with all Spiraeas have little tolerance for drought and they don’t necessarily wilt going straight to crispy (a look not as fixable as wilting). Mulch heavily for the first few seasons. Avoid blasting, reflected heat and and hot dry situations. Wonderful combined with Rhododendrons and Azaleas for similar cultural conditions. In its native haunt it can be found with Pacific Rhododendron, Helenium, Delphiniums and Veratrum. I’ve never seen it afflicted by disease. Watch for aphids, hose those off if they appear. Beautiful in bloom. Very cold hardy. Oregon native plant.

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