Flowers That Start With the Letter O (With Images)

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Flowers That Start With the Letter O

Often overlooked but undeniably stunning, flowers that start with the letter O bring a refreshing mix of form and fragrance to any garden. From the bold Oriental Poppy to the charming Oxeye Daisy and delicate Ornamental Onions, these blooms are as diverse as they are beautiful. In this guide, you’ll find real O-named flowers with images and key planting info to inspire your next floral arrangement or garden design.

1. Obedient Plant (Physostegia virginiana)

Obedient Plant (Physostegia virginiana)

2. Ocean Blue Morning Glory (Ipomoea indica)

Ocean Blue Morning Glory (Ipomoea indica)

3. Oleander (Nerium oleander)

Oleander (Nerium oleander)

4. Oregon Grape (Mahonia aquifolium)

Oregon Grape (Mahonia aquifolium – yellow flowering shrub)

5. Oriental Lily (Lilium orientalis)

Oriental Lily (Lilium orientalis)

6. Oriental Poppy (Papaver orientale)

Oriental Poppy (Papaver orientale)

7. Ornamental Onion (Allium giganteum and others)

Ornamental Onion (Allium giganteum and others)

8. Osteospermum (Osteospermum spp. – African Daisy)

Osteospermum (Osteospermum spp. – African Daisy)

9. Oxeye Daisy (Leucanthemum vulgare)

Oxeye Daisy (Leucanthemum vulgare)

10. Oxalis (Oxalis triangularis, Oxalis stricta)

Oxalis (Oxalis triangularis and Oxalis stricta – wood sorrel)

11. Osmanthus (Osmanthus fragrans)

Osmanthus (Osmanthus fragrans – fragrant flowering shrub)

12. Orange Trumpet Creeper (Campsis radicans)

Orange Trumpet Creeper (Campsis radicans)

13. Orange Jessamine (Murraya paniculata)

Orange Jessamine (Murraya paniculata)

14. Onosma (Onosma echioides – Golden Drop)

Onosma (Onosma echioides – Golden Drop)

15. Ornamental Kale (Brassica oleracea)

Ornamental Kale (Brassica oleracea – flowering variety)

16. Oregano Flower (Origanum vulgare)

Oregano Flower (Origanum vulgare – blooms purple or pink)

17. Oxblood Lily (Rhodophiala bifida)

Oxblood Lily (Rhodophiala bifida)

18. Oncidium Orchid (Oncidium spp. – Dancing Lady Orchid)

Oncidium Orchid (Oncidium spp. – Dancing Lady Orchid)

19. Oenothera (Oenothera biennis – Evening Primrose)

Oenothera (Oenothera biennis – Evening Primrose)

20. Orlaya (Orlaya grandiflora – White Lace Flower)

Orlaya (Orlaya grandiflora – White Lace Flower)

21. Ornamental Cherry Blossom (Prunus serrulata)

Ornamental Cherry Blossom (Prunus serrulata)

22. Orange Daylily (Hemerocallis fulva)

Orange Daylily (Hemerocallis fulva)

More details:

No Name Color Bloom Season Fragrance Native Life Cycle Uses
1Obedient PlantPink, WhiteLate Summer to FallLightNorth AmericaPerennialCut flowers, cottage gardens
2Ocean Blue Morning GloryBlue, PurpleSummer to FallNoneTropical AmericaPerennial VineFences, trellises, ground cover
3OleanderPink, White, Red, YellowSummerFragrantMediterraneanEvergreen ShrubHedges, ornamental shrubbery (toxic)
4Oregon GrapeYellowSpringLightNorth AmericaEvergreen ShrubWildlife gardens, ground cover
5Oriental LilyWhite, Pink, RedMid to Late SummerStrongAsiaPerennial (bulb)Fragrant borders, cut flowers
6Oriental PoppyOrange, Red, PinkLate Spring to Early SummerNoneMiddle EastPerennialBorders, ornamental beds
7Ornamental OnionPurple, Pink, WhiteLate Spring to SummerLightAsia, EuropePerennial (bulb)Pollinator gardens, sculptural blooms
8Osteospermum (African Daisy)White, Purple, Yellow, PinkSpring to FallNoneSouth AfricaPerennial (Annual in cool zones)Containers, bedding displays
9Oxeye DaisyWhite with Yellow CenterSummerLightEuropePerennialMeadows, naturalized landscapes
10OxalisPurple, Yellow, PinkSpring to FallNoneWorldwidePerennialGround cover, indoor plants
11OsmanthusWhite, CreamFallStrong, SweetAsiaEvergreen ShrubHedges, fragrant gardens
12Orange Trumpet CreeperOrange, RedSummer to FallNoneNorth AmericaPerennial VineWalls, fences, hummingbird gardens
13Orange JessamineWhiteSpring to FallFragrantSouth AsiaEvergreen ShrubOrnamental hedges, fragrant gardens
14Onosma (Golden Drop)YellowSpring to Early SummerNoneEurope, AsiaPerennialRock gardens, alpine beds
15Ornamental KalePurple, White, PinkFall to WinterNoneEuropeAnnualWinter borders, container accents
16Oregano FlowerPurple, PinkSummerHerbalMediterraneanPerennialHerbal gardens, pollinator beds
17Oxblood LilyDeep RedLate Summer to FallNoneSouth AmericaPerennial (bulb)Late-season color, borders
18Oncidium Orchid (Dancing Lady)Yellow, Brown, WhiteYear-roundFragrantCentral & South AmericaEpiphytic PerennialIndoor orchid collections, gifts
19Oenothera (Evening Primrose)YellowSummer to Fall (Evening)LightAmericasBiennial/PerennialWildflower gardens, medicinal beds
20Orlaya (White Lace Flower)WhiteSummerNoneEuropeAnnualCut flowers, bouquet filler
21Ornamental Cherry BlossomPink, WhiteSpringLightAsiaDeciduous TreeOrnamental trees, seasonal displays
22Orange DaylilyOrangeSummerNoneAsiaPerennialMass plantings, erosion control

We hope this roundup of O-named flowers helped you discover something new and beautiful to grow. Whether you’re a seasoned gardener or just getting started, these unique blooms are sure to add character to your green space. Keep exploring our flower series for more inspiration from A to Z!

My Garden Insider

The My Garden Insider team is made up of plant lovers, garden enthusiasts, and nature fans who enjoy sharing tips to help your garden grow. From flowers and veggies to tools and tricks, we write easy-to-follow advice for gardeners of all levels. Whether you have a big backyard or a small balcony, we’re here to make gardening simple, fun, and rewarding for you.

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