Plants: B
- Baboon Flower Babiana stricta Garden perennial
- Baby Blue Eyes Nemophila menziesii Garden annual
- Baby Sage Salvia microphylla Flowering shrub
- Baby Sun Rose Aptenia cordifolia Creeping perennial
- Baby's Breath Gypsophila paniculata Garden perennial
- Baby's Tears Soleirolia soleirolii Creeping perennial
- Bachelor's Button Centaurea cyanus Garden annual
- Bacopa Chaenostoma cordatum Garden annual
- Bahiagrass Paspalum notatum Creeping perennial
- Baja Fairy Duster Calliandra californica Flowering shrub
- Baldwin's Ironweed Vernonia baldwinii Wildflower
- Balloon Flower Platycodon grandiflorus Garden perennial
- Banana Shrub Magnolia figo Flowering shrub
- Barbara's Buttons Marshallia grandiflora Wildflower
- Barestem Biscuitroot Lomatium nudicaule Wildflower
- Barley Hordeum vulgare Grain
- Barren Strawberry Waldsteinia fragarioides Creeping perennial
- Barrenwort Epimedium grandiflorum Creeping perennial
- Basil Ocimum basilicum Herb
- Basket of Gold Aurinia saxatilis Creeping perennial
- Bat-Faced Cuphea Cuphea llavea Garden perennial
- Bay Leaf Laurus nobilis Herb
- Beach Morning Glory Ipomoea imperati Creeping perennial
- Beach Pea Lathyrus japonicus Creeping perennial
- Beach Plum Prunus maritima Fruiting
- Beach Sagewort Artemisia pycnocephala Creeping perennial
- Beach Spider Lily Hymenocallis littoralis Bulb
- Beach Strawberry Fragaria chiloensis Berry
- Beach Sunflower Helianthus debilis Creeping perennial
- Beach Wormwood Artemisia stelleriana Creeping perennial
- Beaked Hazelnut Corylus cornuta Nut
- Bear's Breeches Acanthus mollis Garden perennial
- Bearberry Cotoneaster Cotoneaster dammeri Creeping perennial
- Bearded Iris Iris germanica Garden perennial
- Beardlip Penstemon Penstemon barbatus Wildflower
- Beargrass Xerophyllum tenax Wildflower
- Beautybush Kolkwitzia amabilis Flowering shrub
- Bee Balm Monarda didyma Herb
- Beet Beta vulgaris Root
- Bell Heather Erica cinerea Low shrub
- Bell Pepper Capsicum annuum Fruiting
- Bells of Ireland Moluccella laevis Garden annual
- Bermudagrass Cynodon dactylon Creeping perennial
- Berseem Clover Trifolium alexandrinum Legume
- Bethlehem Sage Pulmonaria saccharata Creeping perennial
- Betony Stachys officinalis Garden perennial
- Bieberstein's Crocus Crocus speciosus Garden perennial
- Big Betony Stachys macrantha Garden perennial
- Big Blue Lilyturf Liriope muscari Creeping perennial
- Big Bluestem Andropogon gerardii Grass
- Big-Leaved Aster Eurybia macrophylla Wildflower
- Bigberry Manzanita Arctostaphylos glauca Flowering shrub
- Bigelow's Tansyaster Machaeranthera bigelovii Wildflower
- Bigleaf Hydrangea Hydrangea macrophylla Flowering shrub
- Bigleaf Maple Acer macrophyllum Flowering tree
- Bigroot Geranium Geranium macrorrhizum Creeping perennial
- Billy Buttons Craspedia globosa Garden perennial
- Birchleaf Spirea Spiraea betulifolia Flowering shrub
- Bird of Paradise Strelitzia reginae Garden perennial
- Bird of Paradise Bush Caesalpinia gilliesii Flowering shrub
- Bird's Eye Gilia Gilia tricolor Garden annual
- Bird's-Foot Trefoil Lotus corniculatus Creeping perennial
- Bird's-Foot Violet Viola pedata Wildflower
- Bishop's Cap Mitella diphylla Creeping perennial
- Bishop's Flower Ammi majus Garden annual
- Bitter Cherry Prunus emarginata Flowering shrub
- Bitter Melon Momordica charantia Fruiting
- Bitterroot Lewisia rediviva Wildflower
- Black Cherry Prunus serotina Tree fruit
- Black Cohosh Actaea racemosa Garden perennial
- Black Currant Ribes nigrum Berry
- Black Dalea Dalea frutescens Wildflower
- Black Hawthorn Crataegus douglasii Flowering shrub
- Black Huckleberry Gaylussacia baccata Berry
- Black Locust Robinia pseudoacacia
- Black Mondo Grass Ophiopogon planiscapus Creeping perennial
- Black Oats Avena strigosa Grain
- Black Pepper Piper nigrum Berry
- Black Sage Salvia mellifera Flowering shrub
- Black Titi Cliftonia monophylla Flowering tree
- Black Tupelo Nyssa sylvatica
- Black Willow Salix nigra
- Black-Eyed Pea Vigna unguiculata Legume
- Black-Eyed Susan Rudbeckia hirta Wildflower
- Black-Eyed Susan Vine Thunbergia alata Vine
- Blackberry Rubus fruticosus Berry
- Blackberry Lily Belamcanda chinensis Wildflower
- Blackfoot Daisy Melampodium leucanthum Garden perennial
- Blackhaw Viburnum prunifolium Flowering shrub
- Bladderpod Cleome isomeris Flowering shrub
- Blanket Flower Gaillardia × grandiflora Wildflower
- Bleeding Heart Lamprocapnos spectabilis Garden perennial
- Bleeding Heart Vine Clerodendrum thomsoniae Vine
- Blood Lily Scadoxus multiflorus Bulb
- Blood-Red Trumpet Vine Distictis buccinatoria Vine
- Bloodroot Sanguinaria canadensis Wildflower
- Bloody Cranesbill Geranium sanguineum Garden perennial
- Blue Chalksticks Senecio mandraliscae Succulent
- Blue Corydalis Corydalis flexuosa Wildflower
- Blue Daze Evolvulus glomeratus Low shrub
- Blue Elderberry Sambucus nigra ssp. cerulea Berry
- Blue Fescue Festuca arvernensis Creeping perennial
- Blue Flag Iris versicolor Wildflower
- Blue Flax Linum perenne Wildflower
- Blue Globe Onion Allium caeruleum Allium
- Blue Grama Bouteloua gracilis Grass
- Blue Lace Flower Trachymene coerulea Garden perennial
- Blue Marguerite Felicia amelloides Creeping perennial
- Blue Mistflower Conoclinium coelestinum Wildflower
- Blue Moor Grass Sesleria caerulea Grass
- Blue Mountain Prairie Clover Dalea ornata Wildflower
- Blue Palo Verde Parkinsonia florida Flowering tree
- Blue Passionflower Passiflora caerulea Vine
- Blue Penstemon Penstemon cyaneus Wildflower
- Blue Porterweed Stachytarpheta jamaicensis Flowering shrub
- Blue Potato Bush Lycianthes rantonnetii Flowering shrub
- Blue Ridge St. John's Wort Hypericum buckleii Low shrub
- Blue Sedge Carex flacca Grass sedge
- Blue Spruce Stonecrop Sedum reflexum Creeping perennial
- Blue Star Creeper Isotoma fluviatilis Creeping perennial