Lesser roundleaved orchid (Platanthera orbiculata) is a type of orchid found in many forested regions of North America. In some cases, it is also seen in shaded bogs and marshes. It needs moist soil and partial shade to grow properly. The lesser roundleaved orchid’s leaves grow only at its base, leaving the upper stem with only flowers.
I. Appearance and Characteristics
Platanthera orbiculata, the round leaved orchid or lesser roundleaved orchid, is a species of orchid native to forested areas of North America. It is widespread across most of Canada and parts of the United States (Alaska, New England, Appalachian Mountains, Great Lakes Region, Rocky Mountains, Black Hills and northern Cascades).
There is two accepted subspecies, Platanthera orbiculata var. macrophylla and Platanthera orbiculata var. orbiculata.
Platanthera orbiculata is found in moist to mesic shaded locations in forests. Each plant has two large, nearly round leaves that lie close to the ground, plus a vertical flowering stalk bearing a spike of small, white flowers.
II. How to Grow and Care
Lesser roundleaved orchid requires careful attention to replicate its natural woodland habitat, thriving in cool, moist, and well-drained conditions with partial to full shade. Special care points include maintaining consistent soil moisture without waterlogging and ensuring protection from strong winds. The plant’s susceptibility to root rot and need for specific mycorrhizal fungi make it a challenging species for cultivation.
Sunlight
Lesser roundleaved orchid likes full sun. Plant it in a place with plenty of light, but not direct sunlight. Provide it more than 6 hours of sunlight per day. Remember that insufficient light results in poor quality and may lead to reduced or no blooms.
Temperature
Orchid plants are native to tropical and subtropical regions, preferring warm, moist conditions. Optimum growth temperatures are between 18 to 28 ℃, and it’s best if there is a certain difference in temperature between day and night: for example, 20 to 25 ℃ during the day and 15 to 18 ℃ at night. Lesser roundleaved orchid is a drought-tolerant plant, but cannot tolerate waterlogging, and grows well at 50-70% humidity. If the leaf tips are withered, it means the environment is too dry. Use a humidifier or spray bottle to increase the air humidity.
Watering
Lesser roundleaved orchid is a plant that thrives in moist environments, often found in humid forests and bogs. It has adapted to its native habitat’s conditions, exhibiting a preference for high humidity levels and consistent moisture. This plant requires watering every week to maintain its water balance. As an orchid species typically grown indoors, lesser roundleaved orchid benefits from the controlled environment of containers which allows for better management of its water needs.
Soil
The “soil” required for lesser roundleaved orchid is special because, as an epiphyte, it originally grew on big trees in tropical forests. You need to mimic this growing environment with, for example, water moss, wood chips, coconut shells, volcanic stones, or perlite as soil substrate. You can also buy orchid-specific soil directly from gardening stores.
Fertilizing
For lesser roundleaved orchid, employ balanced nutrition fertilizers to sustain growth and boost flowering. Optimal fertilization occurs in spring and summer with a monthly application at quarter strength. During dormancy in fall and winter, reduce frequency. Precisely measure to avoid root burn and incorporate into watering routine. Utilize a dilute solution for safety, gradually introducing nutrients to adapt to lesser roundleaved orchid’s delicate system. Practice moderation, understanding lesser roundleaved orchid’s natural low-fertility habitats, while ensuring nutrient needs are met for vitality and bloom vigor.
Planting Instructions
You do not need a large pot to grow an lesser roundleaved orchid as it won’t produce a vigorous root system that occupies much space. If the pot is too large, the soil tends to collect water and cause root rot. The height of the pot should be 2.5 cm taller than the (pseudo)bulb of the lesser roundleaved orchid. You can easily buy lesser roundleaved orchid in a local gardening store and simply place it in breathable, well-drained substrate. After planting, use upright sticks to support flowering branches. In warm, humid climates, cover the root of lesser roundleaved orchid with sphagnum moss and attach them to a tree with strings.
Pruning
It is best to prune wilted lesser roundleaved orchid flowers promptly after blooming to reduce unnecessary nutrient consumption and promote more blooms. Trim withered and diseased leaves promptly to increase air circulation, thus reducing pests and diseases.
Propagation
Lesser roundleaved orchid can be propagated by carefully dividing its tuberous rhizomes, a method that encourages the growth of new individuals while retaining the genetic integrity of the species. Care should be taken to minimize damage to the rhizomes during the process. Once divided, each section should have at least one growth point to ensure that it can develop into a healthy new plant. It is crucial to maintain suitable environmental conditions such as humidity, temperature, and light for successful establishment. Careful attention to soil media that mimics its natural habitat will enhance the chances of successful propagation of lesser roundleaved orchid.
Transplanting
For lesser roundleaved orchid, the prime relocation period spans from the warmth of late spring through the zenith of summer, taking advantage of vigorous growth. Choose a shady spot with rich, moist soil. Gentle handling is paramount to protect the delicate roots.
III. Harvesting and Storage
If you want to display lesser roundleaved orchid flowers in vases, harvest there are only 2-3 flowers blooming on the stem. Cut diagonally at the bottom of the flower stem, and place it in a vase immediately. You can enjoy the cut flower in clean water for about 14 days, or for a longer time with preservatives.
