I have vanilla grass.

Sorry I just saw this post! No! they re hardy to zone 8 or 9 I believe. Definitely they cannot be planted in the ground over the winter. I got mine from Richter's . I keep them outside from mid - May to the mid -October, then I bring them indoors and keep them in the unheated portion of the basement in a semi-dormant state. During winter, they need cool night temperatures below 12 degrees C in order to bloom the next season. It took me a few years to get them to bloom since the plants were quite tiny when I received them and then, when they were mature enough to bloom, I did not have any idea that they needed this cooling period before they did. No matter the effort they give me a lot of pleasure. With a little bit of patience they can be grown even here.

I have been wanting it forever too. The closest looking thing I found was the 'Flore Plena' J. sambac from Logee's. The petals aren't as round or broad as Arabian Knights though. I actually think what Logee's is selling as 'Flore Plena' might be Mysore Mulli. The scent of 'Flore Plena' is stronger than Maid of Orleans but Grand Duke of Tuscany still beats them by a mile.

A thread titled "Most Fragrants that Waft" began in March of 2000 as a request for a list of fragrant plants that "drift or waft on the air". After reaching the maximum 100 posts, the thread eventually expired due to inactivity. Not surprisingly, after the first post expired, the subject surfaced again in the post "Fragrants that Waft". The original post, "Most Fragrants that Waft", was saved and was kindly provided by yeona_sky. The following list was compiled by Clare_CA from the original "Most Fragrants that Waft" and the later post "Fragrants that Waft". Abelia trilora Abeliophyllum distichum, White Forsythia Aglaia odorata Aloysia virgatas, Sweet Almond Amaryllis belladonna, Pink Naked Ladies Asclepias incarnata, Swamp Milkweed Azara microphylla Beaumontia grandiflora, Easter Lily Vine Boronia Boronia megastigma, Brown Boronia Bouvardia longiflora Brassavola nodosa, Lady-of-the-Night Orchid Brugmansias Brunfelsia jamaicensis (Lady of the Night, Family: Solanaceae) Buddleia asiatica Buddleia davidii Calycanthus floridus, Carolina allspice or sweetshrub Cananga odorata, Perfume tree Cardiocrinum giganteum, Giant lily Cestrum diurnum Cestrum nocturnum (Night blooming jasmine, Queen of the Night, Night Jessamine, Lady of the Night, Family: Solanaceae) Cheiranthus allionii, Wallflower Chimonanthus praecox, Wintersweet Choisya ternata, Mexican orange blossom Cimicifuga 'Hillside Black Beauty' Citrus Clematis Montana Clematis terniflora, Sweet Autumn Clematis (Family: Ranunculaceae) Clerodendrum bungei (Cashmere (Cashmir) bouquet, Glory Bower, Family: Verbenaceae) Clerodendrum minahasse (Fountain Clerodendrum, Clerodendron, Tube flower, Family: Verbenaceae) Clerodendrum philippinum Schau, C. fragrans pleniflorum, c. chinense (Chinese Glory Bower, Cashmere bouqet, Scent Malli, False Pikake, Glory Tree, Family: Verbenaceae) Clerodendrum trichotomum, (Harlequin Glory, Family: Verbenaceae) Clethra alnifolia, Sweet Pepperbush or Summersweet Clethra 'Ruby Spice' Clidanthus fragrans, Fragrant amaryllis Coffea arabica, C. robusta (Coffee, Family: Rubiaceae) Coleonema pulchrum, Pink Breath of Heaven Convallaria majalis, Lily-of-the-Valley Crinum moorei Crinum odorata, Swamp lily Crinum powellii Daphne bholua Daphne 'Carol Mackie' Daphne odora Daphne x burkwoodii 'Carol Mackie' and 'Somerset' Daphnes Datura inoxia Datura metel Datura wrightii Dianthus Barbatus, Sweet William Dianthus gratianopolitanus Dianthus 'Rainbow Loveliness’ Dioscorea batatas, Cinnamon Vine Dracaena fragans Eupatorium ligustrinum Freesia Gardenia Augusta (Bush Gardenia, Family: Rubiaceae) Gardenia brighamii (Native Hawaiian Gardenia Nau, Family: Rubiaceae) Gardenia Four Seasons (Gardenia Four Seasons, Family: Rubiaceae) Gardenia Jasminoides (Cape jasmine, Family: Rubiaceae) Gardenia jasminoides 'White Gem' (White Gem, Family: Rubiaceae) Gardenia Radicans (Dwarf Gardenia Radicans, Family: Rubiaceae) Gardenia taitensis Star of Tahiti (Tahiti Gardenia, Family: Rubiaceae) Gardenia taitensis Tiare Tahiti (Tahiti Gardenia, Family: Rubiaceae) Gardenia thunbergium (white gardenia, forest gardenia, wild gardenia, Family: Rubiaceae) Gardenia Tubifera Kula (Golden Gardenia, Family: Rubiaceae) Gardenia Vietnamensis (Vietnamese Gardenia, Family: Rubiaceae) Genista fragrans, Sweet Broom, aka Cytisus spachianus Gladiolus callianthus, Acidantheras, Peacock Orchids Gleditsia triacanthos f. inermis, Thornless Honey Locust Hedychium coronaria, common white ginger Hedychium coronarium Hedychium coronarium var. chrysoleum 'Yellow Spot', Ginger lily Hedychium flavescens Hedychium flavum Hedychium gardnerianum, Ginger Lily Helichrysum, Licorice Plant Heliotropium arborescens, Heliotrope Hemerocallis lilioasphodelus (species daylily) Hemerocallis, Daylilies highly fragrant daylilies: ‘Audacity Bound’, ‘Barbara Mitchell’, ‘Buried Treasure’, ‘Catherine Woodbury’, ‘Chorus Line’, ‘Citrina’, ‘Earth Angel’, ‘Elegant Candy’, ‘Ellen Christine’, ‘Evening Bell’, ‘Ever So Ruffled’, ‘Forty Carats’, ‘Fragrant Light’, ‘Frosted Pink Ice’, ‘Frozen Jade’, ‘Gingham Maid’, ‘Golden Scroll’, ‘Graceland’, ‘Hudson Valley’, ‘Hyperion’, ‘Ida Miles’, ‘Ice Carnival’, ‘Kathy Rood’, ‘Lemon Lollypop’, ‘Night Beacon’, ‘Pasta’, ‘Raspberry Candy’, ‘Scape Stopper’, ‘Siloam Double Classic’, ‘Siloam Mamma’, ‘Siloam Spizz’, ‘Smoky Mountain Autumn’, ‘Sweet Shalimar’, ‘Tender Love’, ‘Tetrina’s Daughter’, ‘Top Honors’, ‘Traylyta’, ‘Vanilla Fluff’, ‘Willard Gardner’ Hesperis matronalis, Dame's Rocket, Dame's Violet, Mother of the Evening, Sweet Rocket Holarrhena densiflora, Jasmine Tree Hosta 'Fragrant Bouquet' Hosta 'Guacamole' Hosta plantaginea Hyacinthus, Hyacinths Hymenocallis species, Peruvian daffodil Hymensporum flavum, Sweet Shade tree Illicium Floridanum Ipomoea alba, Moonflowers Iris - Highly fragrant bearded irises include 'Dark Passion', 'Fort Apache', 'Last Chance', 'Mary Frances', 'Old Black Magic', 'Pacific Mist', 'Scented Bubbles', 'Stepping Out', 'Thriller', and 'Sweet Lena' Jasminum Jasminum angulare (South African Jasmine, Family: Oleaceae) Jasminum azoricum, Jasminum trifoliatum Moench, J. bahiense, J. blandum, J. fluminense, J hildebrandtii, J. holstii (River Jasmine, Scrambling Vine, J. De Trapo, Family: Oleaceae) Jasminum dichotomum (Gold Coast Jasmine, Family: Oleaceae) Jasminum humile, J. grandiflorum (Italian Jasmine, Family: Oleaceae.) Jasminum mesnyi, J. primulinum (Japanese Jasmine, Primrose J., Family: Oleaceae) Jasminum Molle (Jasminum Molle, Indian Jui, Family: Oleaceae) Jasminum nitidum, J. magnificum, J. illicifolium (Star Jasmine, Angelwing J., Shining J., Windmill J., Royal J., Family: Oleaceae) Jasminum officinale grandiflorum, J. viminale, J. vulgatum, J. Affine (True jasmine, Common jasmine, French Perfume Jasmine, Poet's jasmine, Catalonian J., Spanish J., Family: Oleaceae) Jasminum parkeri (Family: Oleaceae) Jasminum polyanthum, J. blinii, J. delafieldii (Pink jasmine, Winter Jasmine, Family: Oleaceae) Jasminum pubescens , J. multiflorum, J. gracillimum (Downy Jasmine, Angel Hair Jasmine, Star Jasmine, Family: Oleaceae) Jasminum sambac, J. fragrans, J. undulatum, Mogori Sambac, Mogori undulata, Nyctanthes sambac (Arabian Jasmine, J. Grand Duke Of Tuscany, Butt Mograw, Belle of India, Maid of Orleans, Hawaiian Pikake, Sampaguitas, Family: Oleaceae) Jasminum stephanense (Family: Oleaceae) Jasminum tortuosum (African Jasmine, Perfume jasmine, Family: Oleaceae) Jasminum volubile, J. simplicifolium (Wax Jasmine, Family: ) Lathyrus odoratus, sweet peas Lavandula, Lavender Ligustrum japonicum, Japanese Privet, Wax Leaf Privet Lillium "Le Reve" Lobularia maritima, Sweet Alyssum Lonicera fragrantissima, Winter Honeysuckle Lonicera heckrottii (Honeysuckle, Family: Caprifoliaceae) Lonicera japonica (Japanese Honeysuckle, Halls honeysuckle, Family: Caprifoliaceae) Luculia intermedia Luculia pinceana Magnolia (Family: Magnoliaceae) Magnolia grandiflora Magnolia hypoleuca Magnolia stellata Magnolia virginiana, Sweet Bay Magnolia Magnolia x wieseneri Malcolmia maritima, Virginian stock Matthiola bicornis. Night-scented Stock Matthiola incana, Stock Matthiola longipetala, Evening-scented stock Melilotus alba, Wild Clover Michelia champaca Michelia coco Michelia doltsopa Michelia figo Michelia x alba Mirabilis jalapa (Four o'clocks, Family: Nyctaginaceae) Murraya exotica Mini (Miniature Orange jasmine, Family: Rutaceae) Murraya paniculata (Orange Jasmine, O. Jessamine, Mock Orange, Lakeview jasmine, Family: Rutaceae) Narcissus bulbs Narcissus, Daffodils Nicotiana alata, Jasmine Tobacco, flowering tobacco Nicotiana sylvestris, Woodland Tobacco Nicotiana x sanderae, Flowering Tobacco Osmanthus fragrans, Sweet Olive Passiflora belotii, Passiflora Alatocaerulea, Passionflower Peonies Petunias Philadelphus, Mock Orange Phlox divaricata, Woodland Phlox Phlox stolonifera, Creeping Phlox Pieris x 'Spring Snow' Pittosporum tobira, Mock Orange Pittosporum undulatum, Victorian Box Plumeria, Frangipani Polianthes tuberosa, Tuberose Primula florindae, Tibetan Primrose Prunus mume, Japanese Apricots Quisqualia indica, Rangoon Creeper Reseda odorata, Mignonette Rhododendron atlanticum Rhododendron 'Dexter Spice' Rhododendron fragrantissimum Rhododendron occidentale, Western Azalea Rhododendron veitchianum 'Ashacombe' Ribes Odoratum, Clove Currant, Golden Currant Ribes Viburnifolium, Catalina Perfume Rose, Blanc Double de Coubert rugosa Rose, Double Delight - Hybrid Tea Rose (pretty colors) Rose, Fragrant Cloud - Hybrid Tea Rose Rose, Hansa - Rugosa Rose Rose, Madame Isaac Pereire - Antique Rose Rose, Mister Lincoln - Hybrid Tea Rose, Prospero, Golden Celebration, ‘The Prince’, ‘Fair Bianca’ - David Austin Roses Rose, Scentimental - Hybrid Tea Rose, Sombreuil, climbing antique. Rose, Sweet Chariot - miniature "hanging basket" rose Rose, Tiffany - Hybrid Tea Rose Salvia clevelandii, Cleveland Sage Sansevierias Saponaria officinalis, Soapwart, Bouncing Bet, Fuller's-herb, Lady's-washbowl, Latherwort, Old-maid's-pink Sarcococca Hookeriana Humilis Stephanotis floribunda (Bridal Bouquet, Family: Asclepiadaceae) Styrax japonicus Syringa microphylla 'Superba,' Minature lilac Syringa vulgaris, Lilacs Tilia cordata, Linden Trees Trachelospermum asiaticum, Asian Jasmine, Yellow star jasmine (Family: Apocynaceae) Trachelospermum Jasminoides, Confederate Jasmine, Star Jasmine (Family: Apocynaceae) Valerian officianalis Viburnum carlesii Viburnum farreri Viburnum odoratissimum Viburnum x bodnantense 'Pink Dawn' Viburnum x burkwoodii Viburnum x carlcephalum Viburnum x judii Viburnums Viola odorata, Sweet Violet Weigela florida 'Variegata nana' Wisterias Zaluzianskya ovata, Night phlox