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Common and Latin names |
Plant Type, Hardiness |
Blooming Time |
 |
Oakleaf hydrangea
Hydrangea quercifolia |
Shrub, zone 5-9
More information |
Spring |
 |
Oleander
Nerium oleander |
Tropical shrub, zone 8-10
International Oleander Society |
Early Summer to Fall |
 |
Oleander tree
Nerium oleander |
Tropical shrub, zone 8-10
More information |
Early Summer to Fall |
 |
Orange water-snowflake
Nymphoides hydrocharioides |
Water plant |
Summer |
 |
Orange clock vine
Thunbergia gregorii |
Tropical Vine, zone 9-10 |
Summer |
 |
Orange coneflower
Rudbeckia fulgida |
Perennial, zone 3-9 |
Summer |
 |
Orchids |
Tropical/Temperate
Link to orchid page |
Mostly in Spring |
 |
Orienpet lily hybrid
Lilium spp. |
Bulb, zone 4-9
Link to lily page |
Spring |
 |
Ornamental banana
Musa spp. |
Tropical, zone 10-11 |
Summer |
 |
Ornamental peach
Prunus persica |
Tree, zone 5-8
Link to Vietnamese flowering peach page |
Spring |
 |
Osteospermum, African daisy
Osteospermum spp. |
Annual
More information |
Spring to Fall |
 |
Ox-eye, Sunflower heliopsis,
False sunflower
Heliopsis helianthoides |
Perennial, zone 4-9
More information |
Summer |