Native plants for southwestern oregon


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This is a propgram prepared for OSU Master Gardeners in Josephine County Oregon highlighting plants native to that area that are recommended for home gardens

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Native plants for southwestern oregon

  1. 1. Native Plants for Southwestern Oregon Linda McMahan OSU Extension Yamhill CountyScarlet monkeyflower, Mimuluscardinalis (SW Oregon & CA)
  2. 2. Southwestern Oregon is Unique Rainfall high in winter, low in summer Warmer high temps than most of OR but can be colder in winter Shares some features & plants with Northern CA Shares many plant species with the rest of the Pacific Northwest Oceanspray, Holodiscus discolor, shared with much of OR
  3. 3. Southwestern Oregon is Unique Share some species with Cascades and/or Eastern OR The region is amazingly diverse, with high mountains, soil variations, fertile river valleys, and rocky outcrops
  4. 4. Today‘s Goal Feature plants native to Josephine County Many share plant distributions with other parts of the Oregon or California Some plants native to Oregon but not common in Josephine County may also be grown here, but we will Rocky Mtn maple, Acer not cover those today glabrum, shared with Cascades and Eastern OR
  5. 5. Plants Unique to InnerSouthwestern OregonSome will also occur in neighboring counties or inNorthern California
  6. 6. California fuchsia, Epilobiumcanum (Zauchneria californica) Native to California as well A mounding and spreading sub-shrub for full sun or very light shade Many cultivars available Attracts hummingbirds Wayne‘s silver form
  7. 7. Scarlet monkey flower,Mimulus cardinalis Herbaceous perennial Prefers part-shade and moist soils Native to SW OR and into CA and other SW US states M. cardinalis is shown with native yarrow form (Achillea millefolium)
  8. 8. Skunkbush, Rhus trilobata Sun to light shade Shrub 2-8 feet and spreading Zone 3/4 Food and cover for wildlife Drought tolerant, good for sunny and dry spots Yes it is related to poison oak but OK for gardens nts/rhtrilob.htm
  9. 9. CA black oak, Quercus kellogii Deciduous tree, 40- 80 ft. with open, rounded crown Sun or light shade Drought resistant, succeeds in dry, sandy, or gravelly soil USDA Zone 7 Mostly SW OR but does go north to Lane County quke.htm
  10. 10. Jeffrey pine, Pinus jeffreyi Conifer to 80 or more feet USDA Zone 6 Mountains from southern Oregon to Sierra Nevadas Fragrant needles— three needle bundles, larger cones than Ponderosa pine Can grow on serpentine soils (low calcium-magnesium ratio, high in heavy metals)
  11. 11. Giant Chain Fern –Woodwardia fimbriata ―Choice‖ large fern, each frond to 6 feet Evergreen Needs regular moisture and part-shade to sun Possibly needs frost protection, depending on the site Share distribution with northern California Unique spore structures on frond undersides Photos:
  12. 12. California wild grape, Vitiscalifornica Native to California and SW Oregon Cultivars available, ‗Roger‘s Red‘ is one available-may be a hybrid Vigorous deciduous vine popular in landscapes Red fall color Photo: Propagates easily from cuttings
  13. 13. Golden inside-out-flower,Vancouveria chrysantha Perennial evergreen herbaceous plant spreading by rhizomes Golden blooms in spring Sometimes called the Siskyou inside- out-flower Photo: Mrs. WD Bransford, Considered to be Lady Bird Johnson ―choice‖ by some Wildflower Center, Univ. gardeners so worth Texas at Austin looking for
  14. 14. Plants Shared with Cascadesand/or Eastern OregonMany of these are commonly available in the planttrade
  15. 15. Green manzanita,Arctostaphylos patula  Evergreen shrub, to 7 ft, dark bark  Sun or light shade  Best on well- drained soils, does well on dry sites  USDA Zone 5  SW Oregon to Mountains north and south lants/arpat.htm
  16. 16. Rocky Mountain maple, Acer glabrum  Small broadleaf deciduous tree to 30 ft, often multi- stemmed  Sun to part shade  USDA Zone 4  Distribution shared with Cascade Mtns and Eastward ants/acgl.htm
  17. 17. Mountain mahogany,Cercocarpus ledifolius Broadleaf evergreen shrub or small tree to 15 ft Sun and dry, well- drained soil USDA Zone 6 Distribution shared with mountains and areas to the East celed.htm
  18. 18. Creeping Oregon grape,Berberis (Mahonia) repens – Evergreen shrub/ground cover Spreads underground USDA Zone 5 Works well with snow cover /mare.htm
  19. 19. Rabitbrush – Ericamera(Chrysothamnus) nausosa  Shares distribution with mountains and east of the Cascades  Grey foliage  Drought tolerant  USDA Zone 7  Neutral to slightly alkaline soil
  20. 20. Sulfur buckwheat, Eriogonumumbellatum Drought tolerant buckwheat, needs good drainage Low-growing Flowers variable yellow/gold Needs good drainage to thrive Photo: Stan Shebs,
  21. 21. Fremont silk tassel, Garryafremontii Evergreen shrub, many-branched, 5 to 15 feet Sun or part shade, drought tolerant USDA Zone 6 Requires good drainage Perhaps better adapted to the area Photo: A. Barra, than G. elliptica
  22. 22. Mahala mat, Ceanothus prostratus Woody groundcover Needs good drainage Blue flowers cover plant under favorable conditions Full sun or filtered shade Especially good for a rock garden
  23. 23. Sitka Mtn ash, Sorbus sitchensis Deciduous shrub or multi-trunked small tree to 10 ft Sun or light shade USDA Zone 5 Flat topped, white flowers, red fruits and good fall color Photos: top, Linda R McMahan, bottom, .htm
  24. 24. Pink flowered wood sorrel,Oxalis oregana var. smalliana Now classified just as O. oregana Pink flowered form less aggressive and slightly larger than white flowered form Pink flowered form more local to SW Oregon
  25. 25. Plants Shared withWillamette Valley and NorthThese are usually commonly available in the nurserytrade and generally will do well in SW Oregon
  26. 26. Umbrella plant, Darmera peltata Herbaceous water-loving plant with giant leaves Spreads on ground-level rhizomes Magnificent foliage and flowers Photos: Linda McMahan on the Rogue River and in Flowers emerge cultivation before leaves
  27. 27. Private Garden,BeavertonOregonSword fern(Polystichummunitum) andgroundcover oxalis(Oxalis oregana) in aside garden path
  28. 28. Red FloweringCurrantRibes sanguineum,February/Marchbloomer attractshummingbirds, alsobees. Blue/blackberries are edible anda bird favorite, manycultivars available
  29. 29. Wild bleeding heart, Dicentra formosa  Spreading ground cover, spring blooms  Deciduous in summer without supplemental irrigation  Cultivars are available
  30. 30. Camas Camassia leichtlinii  Sometimes available as a bulb in garden centers  Require wet winters and dry summers  Prefers full sun but part-shade OK  A native Indian heritage plant
  31. 31. Red twigdogwood,Cornus sericeaWet or dry locations,large to 12-15 ft,prune from the base,berries attract birds,butterfly host plant
  32. 32. Inside-out flower,VancouveriahexandraShade-lovingdeciduousgroundcover, yellowfall color
  33. 33. Stream VioletViola glabella,Accent orgroundcover,drought tolerant,butterfly host plant
  34. 34. Mock orange,Philadelphus lewesiiAvailable at nativeplant nurseries andSWCD sales, fragrantand easy—sun topart shade,moderate water
  35. 35. Fairy bells, Prosartes (Disporum)hookeri or P. smithii  Shady, moist sites  Good for woodland garden  Spring flowers, summer fruits  Easy to grow from seeds
  36. 36. SedumspathulifoliumBest native sedum,easy for containers orwell-drained soil,available at manyretail nurseries,cultivars available
  37. 37. Vine Maple, AcercircinatumBest in part shade,some have good fallcolor, bird-friendly
  38. 38.  Check out the recommended requirements for each species Provide water to establish, even if the species is Cultural drought-hardy Requirements Refrain from too much fertilizer- native plants are usually adapted to our typical soils Douglas iris (Iris douglasiana) and Viola adunca
  39. 39.  Leave enough space—some natives may grow larger than anticipated Cultural Many can be pruned, but Requirements some gardeners prefer the natural forms Prune multi- stemmed shrubs Desert parsely (Lomatium sp.) from the base and snowberry (Symphoricarpos sp.)
  40. 40.  Don‘t assume plants are ―deer- proof‖ If you want plants to self- seed or provide Cultural berries for wildlife, don‘t Requirements Ocean spray (Holodiscus discolor) and osoberry (Oemleria cerasiformis)
  41. 41. For More Information! Kruckeberg, Arthur R. 1996. Gardening with Native Plants of the Pacific Northwest, 2nd edition, University of Washington Press, Seattle, WA Yamhill County, OSU Extension Ecogardening at: gardening Selecting native plants for home landscapes in Central Oregon at: /1957/19858/ec1623-e.pdf Oregon Flora Project (interactive maps and photos) at:
  42. 42. Thankyou! Except noted, photos are by the author and can be used freely for educational purposes. Photos from Oregon State University Woody Plant Identification site used by permission of Pat Breen, © Oregon State University. Other photographs are in the public domain with sources noted.