Angelonia
Buddleia (syn. Buddleja) - butterfly bush*
Lavandula - lavender*
Hemerocallis - daylily
Petunia*
Viola odorata - sweet violet*
Viola labradorica - Labrador violet
Pansy
Heliotropium - heliotrope*
Perovskia - russian sage
Salvia officinalis - common sage
Salvia - sage (many ornamental ones are purple)
Passiflora - passion vine (many purple ones)
Verbena - annual and perennial kinds
Diascia - twinspur
Nemesia*
Roses*
Lobularia maritima - sweet alyssum*
Erysimum Bowles Mauve - wallflower*
Phlox divaricata 'Blue Perfume'- sweet phlox*
Phlox paniculata - garden phlox*
Malcolmia maritima - Virginian stock*
Hosta*
Hyacinthus - hyacinth*
Iris - bearded iris'*
Iris sibirica - Siberian iris
Syringa - lilac*
Lathyrus - sweet pea*
Orchid
Vitex agnus-castus - chaste tree*
Echinacea purpurea - coneflower
Nicotiana 'Domino Purple' (and others)
Papaver - many poppies are purple
Tibouchina urvilleana - glory or princess bush
Nepeta - catmint*
Aster
Cymbalaria muralis - kenilworth ivy
Cymbalaria muralis 'Nana' - dwarf kenilworth ivy
Campanula - bellflower
Liriope
Ophiopogon
Muscari - grape hyacinth
Ajuga - bugleweed
Liatris spicata - gayfeather
Hebe
Heathers
Cuphea hyssopifolia - Mexican heather
Calibrachoa - million bells
Sutera - bacopa
Achillea 'Lavender Beauty' - yarrow
Aconitum - monkshood
Agapanthus inapertus nigrescens - lily of the nile
Alstroemeria - peruvian lily
Anemone - many to choose from
Brachyscome 'Toucan Tango' and others - swan river daisy
Dahlia
Dianthus - many to choose from
Digitalis purpurea - foxglove
Geranium - crane's bill (many)
Pelargonium peltatum - ivy geranium
Pelargonium hortorum - zonal geranium
Limonium - statice
Linaria purpurea - toadflax
Osteo*****um - cape daisy
Origanum 'Hopley's - ornamental oregano
Penstemon - beard tongue
Primula - primrose
Prunella vulgaris - self heal
Tulbaghia violacea - society garlic
Vinca minor 'Purpurea' - periwinkle
Impatiens
Lobelia - annual kind comes in lavender
Lisianthus - Texas blue bell
Stokesia 'Purple Parasols' - Stoke's aster
Allium - ornamental onion
Aquilegia - columbine
Erigeron 'Prosperity' - and some others
Tulipa - tulip (a few purple ones available)
Tradescantia 'Concord Grape' - spiderwort