Autumn Color Arrives at the Washington Park Arboretum

(October 3 – 16, 2016)
1) Sorbus alnifolia (Korean Mountain Ash)
- Native to central China, Korea and Japan this medium-sized tree boasts showy 2-3 inch umbrella-shaped clusters of 5-petal white flowers in late spring.
- As summer yields to autumn, clusters of purple-red to orange-red ½ inch showy fruits appear and persist into winter.
2) Gaultheria mucronata (Prickly Heath)
- Formerly known as Pernettya, this southern Chilean native spends the fall awash with showy globose berries in shades from deep plum to pink to white.
- It is dioecious, meaning male and female plants need to be grown together to produce fruit.
3) Austroderia richardii (syn. Cortaderia richardii) (Toe Toe Grass)
- Adaptable to poor soils, this relative of the common, but often troublesome Pampas grass (C. selloana) is far more elegant and the plumes sway gracefully in a gentle breeze.
- Although it hasn’t been considered invasive in the Pacific Northwest yet, it has the potential to re-seed in warmer climates, so we closely monitor its habit and will take appropriate action should it become a problem.
4) Coriaria sarmentosa (Tutu)
- Rhizomatous species that bears root nodules which actively fix atmospheric nitrogen.
- Native to New Zealand, this species thrives in rocky ground ranging from lowland bogs to alpine environments and can form extensive colonies.
- All parts are poisonous, especially the seed inside the black berries.
5) Melicytus crassifolius (Thick-leaved Mahoe)
- Its name roughly translating to ‘honey basket’, this New Zealand native and woody member of the Violaceae family will intoxicate you with its early spring fragrance.
- The species name, crassifolius means ‘thick-leaved’, aptly describing the leathery, waxy leaves of the most cold-tolerant species in the Melicytus genus.
- Fragrant lemon-yellow flowers cluster along branches followed by bright white berries the size of a pea, often developing an unusual steel-blue spot with age.