Common Name |
Botanical Name |
Seed Germination Instructions |
Vine maple |
Acer circinatum |
30-60 days warm-moist stratification followed by 90-120 days cold-moist stratification. Sow outside in fall. |
Common yarrow |
Achillea millefolium |
No pretreatment required. Sow in fall or spring on or just below the soil surface. Needs warm soil and light to germinate. |
Vanillaleaf |
Achlys triphylla |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Columbia monkshood |
Aconitum columbianum |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Horse mint |
Agastache urticifolia |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
Western joepiweed |
Ageratina occidentalis |
No pretreatment required. Sow outside in fall to early spring. Germination may be improved with 30 days cold stratification |
California dandelion |
Agoseris grandiflora |
No pretreatment required. Sow outside in fall to early spring. Germination may be improved with 30 days cold stratification. |
Tapertip onion |
Allium acuminatum |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
Pacific mountain onion |
Allium validum |
60-90 days cold-moist stratification. Sow outside in fall to late winter. |
Menzies’ fiddleneck |
Amsinckia menziesii |
60 days cold-moist stratification. Sow outside in fall for best germination. |
Sharptooth angelica |
Angelica arguta |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Woodland madia |
Ansiocarpus madioides |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
Western columbine |
Aquilegia formosa |
60 days cold-moist stratification. Sow outside in fall to late winter. |
California spikenard |
Aralia californica |
90-120 days cold-moist stratification. Sow outside in fall for best germination. |
Goat’s beard |
Aruncus dioicus |
30-60 days cold-moist stratification. Sow outside in fall to late winter. Plant on soil surface or lightly cover. Seed needs light to germinate. |
Heartleaf milkweed |
Asclepias cordifolia |
60 days cold-moist stratification. Sow outside in fall to early spring. |
Narrowleaf milkweed |
Asclepias fascicularis |
60 days cold-moist stratification. Sow outside in fall to early spring. |
Showy milkweed |
Asclepias speciosa |
60 days cold-moist stratification. Sow outside in fall to early spring. |
California harebell |
Asyneuma prenanthoides |
60 days cold-moist stratification. Sow in fall to late winter. Sow on soil surface or lightly cover. Seed needs light to germinate. |
Deltoid balsamroot |
Balsamorhiza deltoidea |
90 days cold-moist stratification. Sow outside in fall. |
Tall Oregon grape |
Berberis (Mahonia) aquifolium |
90 days cold-moist stratification. Sow outside in fall to late winter. |
Cascade Oregon grape |
Berberis (Mahonia) nervosa |
60 days cold-moist stratification. Sow in fall to late winter. |
California brome |
Bromus carinatus |
No pretreatment required. Sow outside in fall to early spring. |
Chinook brome |
Bromus laevipes |
No pretreatment required. Sow outside in fall. |
Tolmie’s cats ear |
Calochortus tolmiei |
30-60 days cold-moist stratification. Sow in fall to late winter. |
Marsh marigold |
Caltha leptosepala |
60-90 days cold-moist stratification. Sow in fall to late winter. |
Large camas |
Camassia leichtlinii |
60-90 days cold-moist stratification. Sow in fall to late winter. |
Deer brush |
Ceanothus integerrimus |
Soak in hot (not boiling) water for 24 hours, then 60-90 days cold-moist stratification. Sow outside in fall to late winter. |
Birch leaf mountain mahogany |
Cercocarpus betuloides |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Soaproot |
Chlorogalum pomeridianum |
No pretreatment required. Sow outside in fall to early spring. |
Fireweed |
Chamerion angustifolia |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Western redbud |
Cercis occidentalis |
Soak in hot (not boiling) water for 24 hours, then 60-90 days cold-moist stratification. Sow outside in fall to late winter. |
Western clematis |
Clematis ligusticifolia |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
Hound’s tongue |
Cynoglossum grande |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
Mountain larkspur |
Delphinium glaucum |
90-120 days cold-moist stratification. Sow outside in fall. |
Meadow larkspur |
Delphinium nuttallianum |
90-120 days cold-moist stratification. Sow outside in fall. |
Henderson’s shooting star |
Dodecatheon hendersonii |
60-90 days cold-moist stratification. Sow outside in fall to late winter. |
Squirreltail grass |
Elymus elymoides |
No pretreatment required. Sow outside in fall to early spring. |
Blue wildrye |
Elymus glaucus |
No pretreatment required. Sow outside in fall to early spring. |
Capitate sandwort |
Eremogone congesta |
60-90 days cold-moist stratification. Sow outside in fall to late winter. |
Tall wooly buckwheat |
Eriogonum elatum |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Arrowleaf buckwheat |
Eriogonum compositum |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Barestem buckwheat |
Eriogonum nudum |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Sulphur flower buckwheat |
Eriogonum umbellatum |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Oregon sunshine |
Eriophyllum lanatum |
30 days cold-moist stratification. Sow outside in fall to late winter. |
Henderson’s fawn lily |
Erythronium hendersonii |
90 days cold-moist stratification. Sow outside in fall. |
Scarlet monkey flower |
Erythranthe (Mimulus) cardinalis |
No pretreatment required. Sow outside in fall to early spring. Seeds need light to germinate, surface sow. |
Yellow seep monkey flower |
Erythranthe (Mimulus) guttata |
No pretreatment required. Sow outside in fall to early spring. Seeds need light to germinate, surface sow. |
California poppy |
Eschscholzia californica |
30 days cold-moist stratification. Sow outside in fall or early spring. |
Western goldentop |
Euthamia occidentalis |
No pretreatment required. Sow outside in fall to early spring. |
California fescue |
Festuca californica |
30 days cold-moist stratification. Sow outside in fall or early spring. |
Roemer’s fescue |
Festuca roemeri |
30 days cold-moist stratification. Sow outside in fall or early spring. |
Cascara |
Frangula purshiana |
60-90 days cold-moist stratification. Sow in fall to late winter. |
Bluehead gilia |
Gilia capitata |
30 days cold-moist stratification. Sow outside in fall. |
White rushlily |
Hastingsia alba |
60-90 days cold-moist stratification. Sow outside in fall to late winter. |
Bigelow’s sneezweed |
Helenium bigelovii |
30 days cold-moist stratification. Sow outside in fall to late winter. |
Cowparsnip |
Heracleum maximum |
120 days cold-moist stratification. Sow outside in fall. |
Alum root |
Heuchera micrantha |
60 days cold-moist stratification. Sow outside in fall. Seeds need light to germinate, surface sow. |
Oceanspray |
Holodiscus discolor |
90-120 days cold-moist stratification. Sow outside in fall. |
Broad leaved lotus |
Hosackia crassifolia |
Soak in hot (not boiling) water for 24 hours, then 60-90 days cold-moist stratification. Sow in fall to late winter. |
Scarlet gilia |
Ipomopsis aggregata |
30 days cold-moist stratification. Sow outside in fall to early spring. |
Red beardtongue |
Keckiella corymbosa |
30 days cold-moist stratification. Sow outside in fall or early spring. |
Bush beardtongue |
Keckiella lemmonii |
30 days cold-moist stratification. Sow outside in fall or early spring. |
Bolander’s tarweed |
Kyhosia bolanderi |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
Siskiyou lewisia |
Lewisia cotyledon |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
Blue wild flax |
Linum lewisii |
30 days cold-moist stratification. Sow outside in fall or early spring. |
California lomatium |
Lomatium californicum |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Fernleaf biscuitroot |
Lomatium dissectum |
60 days cold-moist stratification. Sow outside in fall. |
Bigseed biscuitroot |
Lomatium macrocarpum |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Nineleaf buscuitroot |
Lomatium triternatum |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Common lomatium |
Lomatium utriculatum |
60 days cold-moist stratification. Sow outside in fall to late winter. |
Pink honeysuckle |
Lonicera hispidula |
60-90 days cold-moist stratification. Sow outside in fall. |
Sickelkeel lupine |
Lupinus albicaulis |
Soak in hot (not boiling) water for 24 hours, then 30 days cold-moist stratification. Sow outside in fall to early spring. |
Silver bush lupine |
Lupinus albifrons |
No pretreatment required. Sow outside in fall to early spring. |
Velvet lupine |
Lupinus leucophyllus |
Soak in hot (not boiling) water for 24 hours, then 30 days cold-moist stratification. Sow outside in fall to early spring. |
Elegant tarweed |
Madia elegans |
No pretreatment required. Sow outside in fall to early spring. |
Large false Soloman’s seal |
Maianthemum racemosum |
Seed takes two years to germinate. Sow outside in fall. 6 months cold-moist stratification, followed by 4 months warm-moist stratification, followed by another 5 months cold-moist stratification. |
Giant blazingstar |
Mentzelia laevicaulis |
60-90 days cold-moist stratification. Sow outside in fall. |
Coyote mint |
Monardella odoratissima |
30 days cold-moist stratification. Sow outside in fall to late winter. |
Coyote tobacco |
Nicotiana attenuata |
No pretreatment required. Sow outside, or start in a greenhouse in spring. |
Indian tobacco |
Nicotiana quadrivalvis |
No pretreatment required. Sow outside, or start in a greenhouse in spring. |
False turtlehead |
Nothochelone nemorosa |
60-90 days cold-moist stratification. Sow outside in fall. |
Douglas’ grasswidow |
Olsynium douglasii |
90-120 days cold-moist stratification. Sow outside in fall. |
Siskiyou Mountains owl’s clover |
Orthocarpus cuspidatus |
90 days cold-moist stratification. Sow outside in fall. |
Indian warrior |
Pedicularis densiflora |
30 days cold-moist stratification. Sow in fall. Hemiparasite, needs host plant to thrive. Parasitic on members of the heath family, such as manzanita or madrone. |
Siskiyou penstemon |
Penstemon anguineus |
60-90 days cold-moist stratification. Sow outside in fall to late winter. |
Hot rock penstemon |
Penstemon deustus |
60-90 days cold-moist stratification. Sow outside in fall to late winter. |
Mountain blue penstemon |
Penstemon laetus |
60-90 days cold-moist stratification. Sow outside in fall to late winter. |
Small flowered penstemon |
Penstemon procerus |
60-90 days cold-moist stratification. Sow outside in fall to late winter. |
Western sweet coltsfoot |
Petasites frigidus |
No pretreatment required. Sow outside in fall to early spring. |
Varilieaf phacelia |
Phacelia heterophylla |
30 days cold-moist stratification. Sow outside in fall or early spring. Seeds need light to germinate, surface sow. |
Tall phacelia |
Phacelia procera |
30 days cold-moist stratification. Sow outside in fall. Seeds need light to germinate, surface sow. |
Mock orange |
Philadelphus lewisii |
90-120 days cold-moist stratification. Sow outside in fall. |
Pacific ninebark |
Physocarpus capitatus |
30 days cold-moist stratification. Sow outside in fall or early spring. |
Hooker’s fairybells |
Prosartes hookeri |
60-90 days cold-moist stratification. Sow outside in fall. |
Chokecherry |
Prunus virginiana |
90-120 days cold-moist stratification. Sow outside in fall. |
Bitter cherry |
Prunus emarginata |
90-120 days cold-moist stratification. Sow outside in fall. |
Golden currant |
Ribes aureum |
90 days cold-moist stratification. Sow outside in fall. |
Wax currant |
Ribes cereum |
90-120 days cold-moist stratification. Sow outside in fall. |
Sierra gooseberry |
Ribes roezlii |
90-120 days cold-moist stratification. Sow outside in fall. |
Sticky currant |
Ribes viscosissimum |
90 days cold-moist stratification. Sow outside in fall. |
Thimbleberry |
Rubus parviflorus |
30 days cold-moist stratification. Sow outside in fall or early spring. |
Waxy coneflower |
Rudbeckia glaucescens |
30 days cold-moist stratification. Sow outside in fall or early spring. |
Western coneflower |
Rudbeckia occidentalis |
30 days cold-moist stratification. Sow outside in fall or early spring. |
Blue elderberry |
Sambucus nigra spp. caerulea |
60-90 days cold-moist stratification. Sow outside in fall. |
Pacific blacksnakeroot |
Sanicula crassicaulis |
30-60 days cold-moist stratification. Sow outside in fall or early spring. |
Lambstongue ragwort |
Senecio integerrimus |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
Arrowleaf ragwort |
Senecio triangularis |
30-60 days cold-moist stratification. Sow outside in fall or early spring. |
Oregon checkermallow |
Sidalcea oregana |
60-90 days cold-moist stratification. Sow outside in fall. |
Bell catchfly |
Silene campanulata |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
West coast Canada goldenrod |
Solidago elongata |
No pretreatment required. Sow outside in fall to early spring. |
Western mountain ash |
Sorbus scopulina |
90-120 days cold-moist stratification. Sow outside in fall. |
Douglas’ spiraea |
Spiraea douglasii |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
Subalpine spiraea |
Spiraea splendens |
30-60 days cold-moist stratification. Sow outside in fall to late winter. |
Lemmon’s needlegrass |
Stipa lemmonii |
90 days cold-moist stratification. Sow outside in fall. |
Claspleaf twistedstalk |
Streptopus amplexifolius |
Seed takes two years to germinate. Sow outside in fall. 6 months cold-moist stratification, followed by 4 months warm-moist stratification, followed by another 5 months cold-moist stratification. |
Leafybract aster |
Symphyotrichum foliaceum |
No pretreatment required. Sow outside in fall to early spring. |
Fringe cups |
Tellima grandiflora |
30 days cold-moist stratification. Sow outside in fall or early spring. |
Western false asphodel |
Triantha occidentalis |
60-90 days cold-moist stratification. Sow outside in fall. |
Vinegarweed |
Trichostema lanceolatum |
60-90 days cold-moist stratification. Sow in fall to late winter. |
California false hellebore |
Veratrum californicum |
30-60 days warm-moist stratification followed by 90-120 days cold-moist stratification. Sow outside in early fall. |
Western verbena |
Verbena lasiostachys |
30-60 days cold-moist stratification. Sow outside in fall or early spring. |
American vetch |
Vicia americana |
No pretreatment required. Sow outside in fall to early spring. |
Narrowleaf mule’s ears |
Wyethia angustifolia |
90 days cold-moist stratification. Sow outside in fall. |
Beargrass |
Xerophyllum tenax |
90-120 days cold-moist stratification. Sow outside in fall. |