Plants: E
- Early Flowering Lilac Syringa × hyacinthiflora Flowering shrub
- Early Goldenrod Solidago juncea
- Easter Lily Lilium longiflorum Bulb
- Eastern Cottonwood Populus deltoides Flowering tree
- Eastern Cyclamen Cyclamen coum Wildflower
- Eastern Prickly Pear Opuntia humifusa Succulent
- Eastern Redbud Cercis canadensis Legume
- Eastern Sandcherry Prunus pumila Tree fruit
- Edging Lobelia Lobelia erinus Garden annual
- Eggplant Solanum melongena Fruiting
- Egyptian Star Cluster Pentas lanceolata Garden perennial
- Elderberry Sambucus nigra Berry
- Elegant Clarkia Clarkia unguiculata Wildflower
- Elephant Garlic Allium ampeloprasum var. ampeloprasum Allium
- Elmleaf Goldenrod Solidago ulmifolia
- Endive Cichorium endivia Leafy
- Endress's Cranesbill Geranium endressii Garden perennial
- Engelmann's Daisy Engelmannia peristenia Wildflower
- English Bluebell Hyacinthoides non-scripta Bulb
- English Daisy Bellis perennis Garden perennial
- English Primrose Primula vulgaris Wildflower
- Epazote Dysphania ambrosioides Herb
- European Columbine Aquilegia vulgaris Garden perennial
- European Wild Ginger Asarum europaeum Creeping perennial
- Evergreen Candytuft Iberis sempervirens Creeping perennial
- Evergreen Huckleberry Vaccinium ovatum Berry