| B |
| Babiana, Baboon flower, Blue freesias |
| Baccharis halimifolia, Groundsel bush |
| Baccharis halimifolia, Groundsel tree; Salt marsh elder; Sea myrtle |
| Baptisia alba, False indigo; White indigo |
| Baptisia alba, False indigo; Wild white indigo |
| Baptisia australis, False indigo; Blue false indigo; Blue wild indigo |
| Bassharis halimifolia, Groundsel tree; Salt marsh elder; Sea myrtle |
| Baumea rubiginosa 'Variegata', Variegated rush |
| Begonia (Tuberous hybrids), Belgian begonias; Tuberous begonias |
| Begonia grandis, Hardy begonia |
| Begonia semperflorens, Wax begonia |
| Begonia xargenteogutta, Begonia; Angelwings |
| Belamcanda chinensis, Blackberry lily; Leopard flower |
| Bellis perennis, English daisy |
| Bellis perennis, True daisy |
| Berberis candidula, Paleleaf barberry |
| Berberis julianae, Wintergreen barberry |
| Berberis koreana, Korean barberry |
| Berberis thunbergii 'Crimson Pygmy', Crimson pygmy Japanese barberry |
| Berberis thunbergii var. atropurpurea, Red barberry |
| Berberis thunbergii, Japanese barberry |
| Berberis triacanthophora, Threespine barberry |
| Berberis verruculosa, Warty barberry |
| Berberis x chenaultii, Chenault barberry |
| Berberis x gladwynensis 'William Penn', William Penn barberry |
| Berberis x mentorensis, Mentor barberry |
| Bergenia cordifolia, Bergenia |
| Bessera, Coral drops |
| Betula grossa, Japanese cherry birch |
| Betula jacqemontii, Whitebarked Himalayan birch |
| Betula lenta, Sweet birch |
| Betula maximowicziona, Monarch birch |
| Betula nigra, River birch |
| Betula papyrifera, Paper birch; Canoe birch |
| Betula pendula, European white birch |
| Betula platyphylla var. japonica 'Whitespire', Whitespire Japanese white birch |
| Betula platyphylla var. japonica, Asian white birch; Japanese white birch |
| Betula platyphylla, Asian white birch |
| Bidens aristosa, Bur marigold; Tick-seed |
| Bidens laevis, Begger's tick |
| Bignonia capreolata; Doxantha capreolata, Cross vine; Trumpet flower |
| Blechnum spicant, Deer fern; Hard fern |
| Bletilla striata, Chinese ground orchid |
| Bletilla striata, Chinese ground orchid; Hardy orchid |
| Bloomeria, Golden stars |
| Borago officinalis, Borage |
| Botrychium virginianum, Rattlesnake fern |
| Bougainivillea spectabilis, Bougainvillea; Paper flower |
| Brasenia schreberi, Water shield; Water target |
| Brassica juncea, Chinese mustard |
| Brassica oleracea var. acepola, Flowering cabbage |
| Briza maxima, Large quaking grass |
| Briza maxima, Quaking oats |
| Brodiaea = Triteleia, Starflower; Wild hyacinth; Grass nut; Fool's onion; Pretty face |
| Browallia speciosa, Amethyst flower |
| Browallia speciosa, Browallia |
| Browallia speciosa, Bush violet |
| Browallia speciosa, Sapphire flower |
| Browallia viscosa, Browallia |
| Brugmansia x candida, Yellow angel's trumpet |
| Buddleia 'Lochinch', Lochinch butterfly bush |
| Buddleia alternifolia, Alternateleaf butterfly bush |
| Buddleia davidii 'Harlequin', Harlequin butterfly bush |
| Buddleia davidii, Butterfly bush |
| Buddleia globosa, Orange ball tree; Orange butterfly bush |
| Buddleia lindleyana, Lindley butterfly bush |
| Buddleia loricata, Loricata butterfly bush |
| Buddleia x weyeriana, Weyer hybrid butterfly bush; Weyeriana butterfly bush |
| Bumelia lycioides, Buckthorn bumelia |
| Buxus 'Green Gem', Green Gem boxwood |
| Buxus 'Green Mountain', Green Mountain boxwood |
| Buxus 'Green Velvet', Green Velvet boxwood |
| Buxus harlandii, Harland boxwood |
| Buxus sempervirens 'Arborescens', Tree boxwood |
| Buxus sempervirens 'Aureovariegata', Variegated boxwood |
| Buxus sempervirens 'Elegantissima', Variegated boxwood; Elegans boxwood |
| Buxus sempervirens 'Suffruticosa', English boxwood |
| Buxus sempervirens 'Vardar Valley', Vardar Valley boxwood |
| Buxus sempervirens, Common boxwood |
| Buxus sinica (B. microphylla), Little leaf boxwood |
| Buxus sinica var. japonica, Japanese boxwood |