Ornamental · Orchidaceae
Ground Orchid
Bletilla striata
A hardy orchid of pleated leaves and magenta-pink flowers, rising straight from garden soil each spring.
Partial shade
Every 3–7 days
USDA 5–9
12–24 in · 30–60 cm
Overview
The ground orchid answers the notion that orchids are beyond ordinary gardeners. It grows from small underground corms in plain garden soil, comes back on its own each year, and asks for little. In spring it unrolls narrow, sharply pleated leaves that fold like a fan and read almost bamboo-like, then lifts a slender stem hung with magenta-pink flowers, each bloom carrying the folded lip and flared segments that mark it clearly as an orchid.
For all the delicacy of those flowers, the plant beneath them is hardy stuff. It is hardy to roughly USDA zone 5, its ribbon-like leaves collapsing to the ground each fall while the corms hold on below, then sending up fresh green shoots as the soil warms. Set in humus-rich, well-drained soil under dappled shade or morning sun, one clump of corms multiplies underground and widens into a generous patch over a few seasons.
Once its roots have gripped, it mostly looks after itself. Steady water through the growing season, a dry rest for the dormant corms over winter, and a split of the crowded clump every few years keep the pleated leaves and pink stems coming back.
Care
The short version: set it in rich, well-drained soil in partial shade, hold it moist through spring and summer, and let the corms rest dry over winter. Divide the clump every few years and it lifts fresh magenta-pink flowers each spring above its pleated leaves.
Light
Ground orchids grow best in partial shade, the dappled, shifting light or soft morning sun of a woodland edge, which keeps the pleated leaves a fresh clear green. They will take more sun, even full sun, as long as the soil stays moist beneath them. Deep, heavy shade is the one setting where the flower stems stay sparse.
Water
Keep the soil evenly moist through spring and summer while the leaves are expanding, checking it every 3 to 7 days. Once the foliage yellows and dies back, ease off and let the plump dormant corms sit out winter on the dry side. Soggy winter soil is the fastest way to turn those firm corms to soft brown rot.
Soil
Plant it in humus-rich, well-drained loam loaded with organic matter that the roots can grip. A pH anywhere from 5.5 to 7.0 suits it, so most garden soil is already close. Sharp drainage matters most, above all as the cold months close over the corms.
Temperature
This is a cold-hardy orchid, at ease across a wide range from about -13°F to 86°F (-25°C to 30°C). The ribbon-like top growth dies down with the first hard frosts, while the corms hold underground through winter and push up pointed new shoots in spring.
Humidity
Average humidity, somewhere around 40% to 60%, keeps the foliage in good condition, and outdoor air supplies that on its own. No misting or extra moisture is called for.
Feeding
Feed it a balanced general-purpose fertilizer monthly through spring and summer while the leaves and flower stems are growing. Stop once the foliage begins to yellow in fall, when the dormant corms have no use for it.
Pruning
Very little cutting is needed. Snip off the spent flower stalks once the pink blooms fade, and cut the ribbon-like foliage back in late fall after it yellows. That is the whole job.
Repotting
A clump can sit for 3 to 4 years before the corms crowd it. When the pseudobulbs push up congested above the soil, flowering thins, or the center of the clump goes bare, it is time to lift and divide. That same reset yields plump corms to plant elsewhere.
Size & spacing
Plants reach 12 to 24 inches (30 to 60 cm) tall, the flower stems standing above the leaves, and each clump spreads 12 to 18 inches (30 to 45 cm) wide. Set divisions about that far apart so every clump has room to fill out without crowding its neighbors.
When to plant
Ground orchid corms go into the soil in early spring, as the ground warms and the first pointed shoots break dormancy. The flowers open in late spring, usually across May and June, riding above the pleated leaves that carry on green through summer before dying back for winter.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: early spring
- Harvest: late spring (May to June)
Hardiness
USDA hardiness zones: 5–9
Temperature: down to -29°C
Troubleshooting
Ground orchids meet few problems, and the ones they do show up plainly on the plant itself. Most trace back to wet winter soil around the corms, a slug chewing the young leaves, or a clump grown too dense to bloom. Match what you see below and act while it is still a small fix.
Shoots that fail to appear in spring or rot at the base
When bare soil sits where shoots should stand, or the young shoots slump over and go soft where they meet the ground, the trouble is pseudobulb rot, brought on by soil kept wet around the corms all winter. Frost can add to it, striking bare corms in the coldest zones. Lift one and read its flesh: firm and pale means life, soft and brown and mushy means loss. Only the firm corms return to fast-draining soil, and a layer of mulch over the bed shields them before the next freeze.
Fix:
- Lift and discard rotted corms, replant healthy firm pseudobulbs in fast-draining amended soil
- Improve drainage by incorporating grit or planting in a raised bed
Healthy leaves but few or no flowers
Broad green leaves in full health above bare or nearly bare flower stems point to an overcrowded clump or too much shade. Underground, the pseudobulbs press together in a tight, congested mass with no room left to bloom. Splitting that clump in early spring loosens the crowding and returns the flowers, and a move into morning sun or dappled light gives the buds the light they lacked.
Fix:
- Divide congested clumps in early spring to reinvigorate flowering
- Relocate to a site with morning sun or dappled light
Ragged holes chewed through leaves and flowers
Torn, irregular holes punched through the leaf blades and flower petals are the work of slugs and snails, which rasp into the soft new growth as it pushes up in spring. Their glistening slime trails run across the foliage, and the animals themselves come out at dusk or after rain. A round of hand-picking clears them, and a barrier or bait circling the young shoots keeps fresh chewers off the tender tissue.
Fix:
- Hand-pick slugs and snails in the evening
- Use barriers or appropriate slug controls around emerging shoots
Toxicity
For homes with pets and children, the ground orchid is non-toxic and safe from its leaves down to its corms. Orchids as a group carry nothing harmful, and no poison sits in the green blades, the pink flowers, or the fleshy underground pseudobulbs. The worst a nibble brings is a mild, passing stomach upset, the same as with almost any plant.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Cats are safe. A cat that bites into a leaf may drool a little or turn briefly queasy, the ordinary response to almost any houseplant, and no poison exists anywhere in this orchid.
Dogs None
Dogs are safe. No toxin runs through any part of the plant, though a dog that swallows a large mouthful of the fibrous leaves may feel briefly unsettled from the roughage.
Horses Safe
Horses are unaffected. The leaves and stems carry nothing harmful, so a grazing bite passes without trouble.
Rabbits Safe
Rabbits are safe. Neither the green leaves nor the underground corms hold a toxin, so a stray nibble does no harm.
Livestock Safe
Cattle, goats, and sheep are safe. Nothing in the foliage poses a poisoning risk to grazing animals.
Birds Safe
Birds are safe. A pet or backyard bird can share a room with this orchid at no risk.
People Safe
People, children included, are safe. The plant is grown for its flowers, not for eating, but a stray taste harms no one.
No special handling precautions are needed, though as with any plant, ingestion of large amounts may cause mild stomach upset.
Varieties
Beyond the common magenta-pink form, a few named selections stand out for their flower color or their leaf markings. These are the ones you will come across most often.
'Alba'
Its flowers open pure white rather than the species' usual magenta-pink.
var. albostriata
Fine creamy white edges and stripes run the length of its leaves, patterning the foliage even when no flowers are present.
'Big Bob'
A vigorous form with a taller, stockier build and noticeably larger flowers.
How to propagate
Ground orchids multiply readily, with no seed and no special skill. A mature clump of corms hands you new plants each spring, either by splitting the whole knot apart or by lifting off its plump offset corms.
DivisionEasy
Early spring before or as new growth emerges · One growing season
Division is the usual way to make more, timed to early spring just before or as the new shoots break the soil. The whole clump lifts out to reveal a knot of pseudobulbs, which pull apart so each piece keeps at least one firm pseudobulb bearing a live growth eye, then go straight back into the ground. Each division roots in and takes hold over a single growing season.
Bulbs & cormsEasy
Early spring · One growing season
The offset corms give a second way to spread a planting. In early spring, the plump offset pseudobulbs snap free of the parent clump and go back into the soil at the depth they sat before. Over a single growing season each one thickens into a new clump of its own.
Myths
Every orchid is a fussy tropical that must live indoors.
Many orchids are tender, but this is a hardy terrestrial grown out in the garden soil. It survives winters down to about USDA zone 5, its top growth dying back to the ground in fall and pushing up fresh green shoots again in spring.
Orchids are parasites that feed off trees and harm them.
This ground orchid roots down into the soil and makes all its own food through its leaves. It takes nothing from other plants, rising instead from squat, pseudobulb-like corms held just below the surface.