✾
Maltese Cross
Lychnis chalcedonica
✾
Marguerite
玛格丽特 · マーガレット
Argyranthemum frutescens
Spring
✾
Marigold
万寿菊 · マリーゴールド
Tagetes erecta
Summer–Autumn
✾
Maximilian Sunflower
Helianthus maximiliani
✾
Meadow Bistort
Persicaria bistorta
✾
Meadow Rue
Thalictrum aquilegiifolium
✾
Meadowsweet
Filipendula ulmaria
✾
Mexican Aster
Cosmos bipinnatus
✾
Mexican Bush Sage
Salvia leucantha
✾
Mexican Sunflower
Tithonia rotundifolia
✾
Million Bells
Calibrachoa spp.
✾
Mimosa
含羞草 · ミモザ
Acacia dealbata
Winter–Spring
✾
Mini Lobata
Ipomoea lobata
✾
Miss Willmott’s Ghost
Eryngium giganteum
✾
Mock Orange
Philadelphus coronarius
✾
Moonflower
Ipomoea alba
✾
Morning Glory
牵牛花 · アサガオ
Ipomoea nil
Summer
✾
Morning Glory
Ipomoea purpurea
✾
Mountain Witch Alder
Fothergilla latifolia
✾
Muscari
葡萄风信子 · ムスカリ
Muscari armeniacum
Spring
✾
Narcissus
水仙
Narcissus tazetta
Winter
✾
Nemophila
粉蝶花 · ネモフィラ
Nemophila menziesii
Spring
✾
Night-Scented Stock
Matthiola longipetala
✾
Nodding Wakerobin
Trillium flexipes
✾
Obedient Plant
Physostegia virginiana
✾
Ohio Spiderwort
Tradescantia ohiensis
✾
Old Lady Cactus
Mammillaria hahniana
✾
Oleander
Nerium oleander
✾
Orchid
兰花 · 蘭
Orchidaceae
Spring–Summer
✾
Oriental Lily
Lilium (Oriental types)
✾
Oriental Poppy
Papaver orientale
✾
Ornamental Onion
Allium giganteum
✾
Osmanthus
桂花 · 金木犀
Osmanthus fragrans
Autumn
✾
Ox-Eye Daisy
Leucanthemum vulgare
✾
Oyster Plant
Mertensia maritima
✾
Ozark Sundrops
Oenothera macrocarpa
✾
Pansy
三色堇 · パンジー
Viola tricolor
Spring
✾
Paperbush
Edgeworthia chrysantha
✾
Paraguay Nightshade
Lycianthes rantonnetii
✾
Parrots Beak
Lotus berthelotii