The wildflowers are great, and should be fantastic for at least another few weeks. In addition to the wildflowers, on a clear day you will have wonderful views of Mount Hood and Mount Adams.
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Blooming in forested areas: Beargrass <I>(Xerophyllum tenax)</I>, Broad-Leaf Star Flower <I>(Trientalis latifolia)</I>, Spotted Coralroot <I>(Corallorrhiza maculata)</I>, Inside-Out Flower <I>(Vancouveria hexandra)</I>, Thimbleberry <I>(Rubus parviflorus)</I>, Hooker's Fairybell <I>(Disporum hookeri)</I>, Western Serviceberry <I>(Amelanchier alnifolia)</I>, Candyflower <I>(Claytonia sibirica)</I>, Star-Flowered Solomon's Seal <I>(Smilacina stellatum)</I>, False Solomon's Seal <I>(Smilacina racemosa)</I>, Columbia Windflower <I>(Anemone deltoidea)</I>, Inside-Out Flower <I>(Vancouveria hexandra)</I>, Bunchberry <I>(Cornus canadensis)</I>, Western Columbine <I>(Aquilegia formosa)</I>, Vanilla Leaf <I>(Achlys triphylla)</I>, American Vetch <I>(Vicia americana)</I>, Stream Violet <I>(Viola glabella)</I>, Fringecup <I>(Tellima grandiflora)</I>, Western Meadowrue <I>(Thalictrum occidentale</I>), Foamflower <I>(Tiarella trifoliata)</I>. Although none were yet blooming, there will be dozens (if not hundreds!) of Tiger Lilies <I>(Lilium columbianum)</I> in the near future.
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Blooming in meadows and rocky areas: Northwest Balsamroot <I>(Balsamorhiza deltoidea)</I>, Harsh Paintbrush <I>(Castilleja hispida)</I>, Blue-Headed Gilia <I>(Gilia capitata)</I>, Spring Gold <I>(Lomatium utriculatum)</I>, Columbia Gorge Lupine <I>(Lupinus latifolius </I>var.<I> thompsonianus)</I>, Western Wallflower <I>(Erysimum capitatum)</I>, White Western Groundsel <I>(Senecio integerrimus </I>var.<i> ochroleucus)</i>, Stonecrop <I>(Sedum sp.)</I>, Upland Larkspur <I>(Delphinium nuttallianum)</I>, Small-Flowered Blue-Eyed Mary <I>(Collinsia parviflora)</I>, Catchfly <I>(Silene sp.)</I>, Spreading Phlox <I>(Phlox diffusa)</I>, Rock Penstemon <I>(Penstemon rupicola)</I>, Subalpine Mariposa <I>(Calochortus subalpinus)</I>, Small-Flowered Penstemon <I>(Penstemon procerus)</I>, Annual Agoseris <I>(Agoseris heterophylla </I>var. <I>heterophylla)</I>, Wild Strawberry <I>(Fragaria vesca)</I>, Field Chickweed <I>(Cerastium arvense)</I>, Oregon Sunshine <I>(Eriophyllum lanatum)</I>, and Olympic Onion <I>(Allium crenulatum)</I>.
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Driving directions to trailhead can be found <a href="http://www.portlandhikersfieldguide.org/wiki/Grassy_Knoll_Trailhead" target="_blank">here</a>. Some spots may be tricky for a normal (low clearance) passenger vehicle.
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Hike information can be found <a href="http://www.nwhiker.com/GPNFHike73.html" target="_blank">here</a>. Most of the wildflowers can be viewed within the first three miles of the hike. I recommend continuing at least one mile beyond (north of) Grassy Knoll.