H = host or food plant
N = nectar source

Native trees and shrubs

Big-leaf maple (Acer macrophyllum) H
Red Alder (Alnus rubra) H
Bearberry (Arctostaphylos uva-ursi) H
Cottonwood (Populus trichocarpa) H
Cascara (Rhamnus purshiana) H
Madrone (Arbutus menziesii) H
Oceanspray (Holodiscus discolor) H, N
Douglas fir (Pseudostuga menziesii) H
Western red cedar (Thuja plicata) H
western hemlock (Tsuga heterophylla) H
Salal (Gaultheria shallon) H
Oregon grape (Mahonia spp.) N
Red osier dogwood (Cornus sericea) H, N
Rhododendron (R. macrophyllum) H, N
Mock orange (Philadelphus sp.) N
Osoberry (Oemleria cerasiformis) N
Pine (Pinus spp.) H
Flowering currant and Gooseberry (Ribes spp._) H
Rose (Rosa spp.) H, N
Hawthorn (Crataegus sp.) H, N
Oak (Quercus spp.) H
Willow (Salix spp.) H
Ash (Fraxinus spp.) H

Non-native trees and shrubs

Cherry, plum (Prunus) H, N
California lilac (Ceanothus spp.) H
Apple (Malus) H
Birch (Betula) H
Lilac (Syringa) N
Heather (Calluna vulgaris) N

Perennials and annuals

Carrot family plants (carrot, parsley, dill) H
Pea family plants/ legumes (pea, lupine, clover, alfalfa) H, N
Composite flowers (aster, coreopsis, sunflower, coneflower, daisy, black-eyed susans, goldenrod, blanketflower) H, N
Mallow family plants (hollyhock, mallow) H, N
Mint family plants (mint, sage, bluebeard, lavender) N
Violets (Viola) H, N
Milkweed (Asclepias) H, N
Borage H
Zinnia N
Penstemon N
Lantana N
Verbena N
Aubrietia N
Clematis N
Sedum H

Native wildflowers

Pearly everlasting (Anaphalis) H, N
Fireweed (Epilobium) N
Columbine (Aquilegia) N
Monkeyflower (Mimulus spp.)
Bleeding heart (Dicentra formosa) H
Native grasses H
Stinging nettle (Urtica) H, N
Wild buckwheat (Eriogonum) H
Lupine (Lupinus) H

Weeds H, N

Wintercress
Dock
Thistle
Dandelion
Blackberry
Mustard
Buttercup
Knotweed
Fennel