Tall white bog orchid
Platanthera dilatata · Orchidaceae
The gardener's calendar
Ideal time to plant tall white bog orchid: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Orchidaceae
- Type
- Perennial herb
- Flowering
- July to September
- Adult size
- 30 to 90 cm in height
- Foliage
- Deciduous, disappears after flowering
- Hardiness
- Hardy down to -30 °C
- Origin
- North America (humid and cold areas)
- Growth
- Slow to moderate
Care
Light exposure
Place your dilated habenaria in partial shade or indirect light. It appreciates a cool, humid environment, away from intense direct sun which would dry out its natural habitat. Positioning it under trees or at the edge of a wooded area reproduces its ideal conditions.
Soil and substrate
This terrestrial orchid requires very moist, organic-rich, well-draining soil. Improve your soil with compost, peat moss, or forest humus to maintain constant moisture without waterlogging. Slightly acidic pH is preferable.
Watering
Keep the soil moist throughout the growing season and flowering period. Water regularly in summer without allowing standing water. After the foliage disappears, gradually reduce watering, as the plant enters underground dormancy.
Fertilizing
Apply a highly diluted orchid or terrestrial plant fertilizer in spring and early summer. Moderate feeding is sufficient, as wild orchids thrive in nutrient-poor environments. Avoid excesses that compromise flowering.
Pruning and cleaning
No pruning is necessary. Simply remove spent flowers to prevent plant exhaustion. Let the foliage disappear naturally in autumn; do not cut dead stems until the following spring.
Diseases and pests
Dilated habenaria is generally robust in natural conditions. Be careful to avoid standing humidity which promotes rot. Inspect regularly to detect any signs of insect pests, especially in potted plants.
Did you know?
Dilated habenaria fascinates botanists with its specialized root system: its underground tubers allow it to survive the rigors of North American winters and rebirth each spring. The scientific name "dilatata" references its widely dilated white sepals, and this native orchid produces a sweet fragrance in late afternoon to attract its specific pollinators.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Chinese ground orchidBletilla striata
- Moth orchidPhalaenopsis amabilis
- Spotted orchidDactylorhiza maculata
- Lesser twaybladeNeottia ovata
- Broad-leaved helleborineEpipactis helleborine
- Western Marsh-orchidDactylorhiza majalis
Tips generated and checked by Viridia — adapt them to your local climate.