Plants: D
- Daffodil Narcissus pseudonarcissus
- Dahlberg Daisy Thymophylla tenuiloba Garden annual
- Dahlia Dahlia pinnata
- Dahoon Holly Ilex cassine Flowering shrub
- Dahurian Rhododendron Rhododendron dauricum Flowering shrub
- Daikon Raphanus sativus var. longipinnatus Root
- Dalmatian Bellflower Campanula portenschlagiana Creeping perennial
- Damask Rose Rosa × damascena Flowering shrub
- Damianita Chrysactinia mexicana Flowering shrub
- Damson Plum Prunus domestica subsp. insititia Tree fruit
- Dancing Ladies Ginger Globba winitii
- Dandelion Taraxacum officinale Leafy
- Darley Dale Heath Erica × darleyensis Low shrub
- Davidson's Penstemon Penstemon davidsonii Creeping perennial
- Daylily Hemerocallis fulva Leafy
- Deer Fern Blechnum spicant Fern
- Deerberry Vaccinium stamineum Berry
- Deerbrush Ceanothus integerrimus Flowering shrub
- Deergrass Muhlenbergia rigens Grass
- Deerweed Lotus scoparius Legume
- Delavay Osmanthus Osmanthus delavayi Flowering shrub
- Dense Blazing Star Liatris spicata Garden perennial
- Desert Agave Agave deserti Leafy
- Desert Globemallow Sphaeralcea ambigua Wildflower
- Desert Marigold Baileya multiradiata Wildflower
- Desert Milkweed Asclepias erosa Wildflower
- Desert Olive Forestiera pubescens Flowering shrub
- Desert Penstemon Penstemon pseudospectabilis Wildflower
- Desert Rose Adenium obesum Flowering shrub
- Desert Sand Verbena Abronia villosa Wildflower
- Desert Willow Chilopsis linearis Flowering tree
- Desert Zinnia Zinnia acerosa Wildflower
- Devil's Trumpet Datura metel Flowering shrub
- Devil's Walking Stick Aralia spinosa Flowering shrub
- Dichondra Dichondra micrantha Creeping perennial
- Dill Anethum graveolens Herb
- Dixie Iris Iris hexagona Garden perennial
- Dog Rose Rosa canina Flowering shrub
- Dogtooth Violet Erythronium dens-canis Garden perennial
- Dotted Blazing Star Liatris punctata Wildflower
- Doublefile Viburnum Viburnum plicatum Flowering shrub
- Douglas Aster Symphyotrichum subspicatum Garden perennial
- Douglas Iris Iris douglasiana Wildflower
- Douglas' Dustymaiden Chaenactis douglasii
- Dove Tree Davidia involucrata Flowering tree
- Downy Hawthorn Crataegus mollis Flowering tree
- Downy Serviceberry Amelanchier arborea Flowering tree
- Downy Skullcap Scutellaria incana Wildflower
- Downy Wood Mint Blephilia ciliata Wildflower
- Dropwort Filipendula vulgaris Wildflower
- Drummond's Aster Symphyotrichum drummondii Wildflower
- Drumstick Allium Allium sphaerocephalon Bulb
- Drumstick Primrose Primula denticulata Garden perennial
- Dusky Cranesbill Geranium phaeum Wildflower
- Dutch Crocus Crocus vernus Garden perennial
- Dutch Iris Iris × hollandica Bulb
- Dutchman's Breeches Dicentra cucullaria Garden perennial
- Dwarf Bearded Iris Iris pumila Garden perennial
- Dwarf Blazing Star Liatris microcephala
- Dwarf Chinese Astilbe Astilbe chinensis var. pumila Creeping perennial
- Dwarf Cinquefoil Potentilla canadensis Creeping perennial
- Dwarf False Indigo Amorpha nana Flowering shrub
- Dwarf Flowering Almond Prunus glandulosa Flowering shrub
- Dwarf Fothergilla Fothergilla gardenii Flowering shrub
- Dwarf Goatsbeard Aruncus aethusifolius Garden perennial
- Dwarf Goldenrod Solidago sphacelata Garden perennial
- Dwarf Morning Glory Convolvulus tricolor Garden annual
- Dwarf Plumbago Ceratostigma plumbaginoides Creeping perennial
- Dwarf Rose Rosa gymnocarpa Flowering shrub
- Dwarf Solomon's Seal Polygonatum humile Creeping perennial
- Dwarf Sweetbox Sarcococca hookeriana var. humilis Low shrub
- Dwarf Violet Iris Iris verna Creeping perennial
- Dyer's Greenweed Genista tinctoria Flowering shrub