Ground orchids root in garden soil instead of bark or moss. Growers also call them terrestrial orchids, and many form tubers or pseudobulbs underground. Two species dominate home gardens: Chinese ground orchid (Bletilla striata) and Philippine ground orchid (Spathoglottis).
Most orchids sold in stores are epiphytic orchids that cling to tree bark in the wild. Ground orchid plants work differently, since their roots sit in real dirt like a hosta or daylily. That difference changes how you water, pot, and overwinter them.
A pseudobulb stores water and energy at the base of the leaves. A tuber does the same job underground, closer to a dahlia than a typical orchid root ball. Both let ground orchids survive a dry spell or a cold dormant season better than most epiphytes can.
See the types of orchids overview for how ground orchids compare to epiphytes and other terrestrial genera. This guide covers the two common garden species, their soil and water needs, and winter handling by zone.
Meet the Two Popular Ground Orchids
Chinese ground orchid (Bletilla striata) is the cold hardy option. It grows in USDA zones 5 to 9 and dies back each winter. Spring flowers appear in purple, pink, or white on spikes 12 to 18 inches tall.
Bletilla forms flattened pseudobulbs just under the soil surface. New shoots push up from those pseudobulbs each spring, then the plant goes fully dormant by late fall. A single clump can hold a dozen pseudobulbs after three or four seasons in the ground.
Philippine ground orchid (Spathoglottis) suits warm climates instead. It thrives outdoors in zones 10 to 11 and stays evergreen there. Blooms appear nearly year round in pink, yellow, or magenta shades.
Spathoglottis grows from small pseudobulbs at soil level, each topped with pleated, grasslike leaves. A healthy clump can send up a new bloom spike almost every month in frost free climates. Growth slows noticeably once temperatures drop below 60 F.
Outside those zones, gardeners grow Spathoglottis in a pot and bring it in before frost. Both species spread into clumps over a few seasons. Divide them when the clump crowds its space.
The hardy one has its own full profile in Bletilla striata. The tropical one is covered under the Chinese crown orchid.
Bletilla vs Spathoglottis at a Glance
| Feature | Chinese Ground Orchid (Bletilla) | Philippine Ground Orchid (Spathoglottis) |
|---|---|---|
| Hardiness zones | 5 to 9 | 10 to 11, or pot elsewhere |
| Growth habit | Deciduous, dies back in winter | Evergreen, clumping |
| Bloom time | Spring to early summer | Nearly year round in warm climates |
| Height | 8 to 18 inches | Around 18 inches |
| Storage organ | Underground pseudobulb | Pseudobulb at soil level |
| Winter care | Mulch in place, or lift and store dry | Move potted plants indoors before frost |
What Most Guides Get Wrong About Ground Orchid Care
Many care pages treat all ground orchid plants as one plant with one set of rules. Bletilla and Spathoglottis actually split on the two things that matter most: winter temperature and planting depth. Copying one species’ routine onto the other is the fastest way to lose a plant.
Planting Spathoglottis too deep is a common mistake with real consequences. Its pseudobulbs sit at or slightly above the soil line in the wild. Bury them like a typical bulb and the crown rots within a season, especially in humid climates.
Planting and Soil for Ground Orchid Care
Ground orchid care starts with the right soil. Both species need loose, organic soil that drains fast, since standing water rots the roots and pseudobulbs. Work compost or fine bark into heavy clay before planting.
A mix of two parts garden soil, one part compost, and one part sand works well for both species. That ratio keeps oxygen at the roots while still holding moisture. Raised beds or mounded rows help in yards with heavy clay soil.
Plant Bletilla pseudobulbs about 2 inches deep, and Spathoglottis slightly above the soil line to reduce rot risk. Choose a spot with morning sun and afternoon shade in hot regions. Full sun works in cooler climates for Bletilla.
Watering and Feeding
Rainfall alone covers most of the watering in humid climates during the growing season. Dry spells still call for a deep soak once or twice a week. Container grown Spathoglottis dries out faster than plants in open garden beds, so check pots more often.
Water ground orchids often enough to keep the soil damp, never soggy. Both species struggle in standing water more than they struggle with a dry week. Reduce watering once Bletilla goes dormant in fall.
Feed monthly during active growth with a balanced fertilizer at quarter to half label strength. Stop feeding Bletilla once leaves yellow and drop. Spathoglottis in mild climates can keep light feeding through most of the year.
A balanced feed is enough, since high phosphorus bloom formulas have not been shown necessary for orchids. Skip fertilizer entirely for the first month after planting or dividing. Fresh cuts and new roots burn easily at full strength.
A seasonal care calendar makes it easier to track watering and feeding changes by month.
How to Choose Ground Orchids for Your Winter Zone
Zone decides which ground orchid works outdoors, and it decides winter handling too. In zones 5 to 9, plant Bletilla in the ground and mulch heavily before the first frost. In zones 10 and 11, Spathoglottis can stay outside year round.
In zones 8 and 9, a 3 to 4 inch mulch layer usually protects Bletilla pseudobulbs through winter. Gardeners in zone 5 or 6 often get better results lifting the pseudobulbs and storing them dry indoors. Replant no deeper than 4 inches once soil warms in spring.
Below zone 10, grow Spathoglottis in a container and move it indoors near 60 F before nights turn cold. Gardeners in colder zones sometimes want a permanent outdoor ground orchid. Other hardy orchid species suit that goal better than Spathoglottis.
Check whether orchids can live outside in your specific zone before committing to an in ground planting.
Buying Ground Orchid Plants
Nurseries sell ground orchids as bare root pseudobulbs or as potted, actively growing plants. Bare root Bletilla is common in early spring and costs less per plant. Potted Spathoglottis is easier to establish, since the roots never fully dry out before planting.
Check bare root pseudobulbs for firmness before buying, and skip any that feel soft or hollow. A healthy pseudobulb feels solid, like a small potato. Local garden centers in warm states often carry Spathoglottis as a bedding plant alongside other tropicals.
How Long Until Ground Orchids Bloom
Newly planted Bletilla pseudobulbs often skip their first spring and bloom the following year. Established clumps bloom reliably every spring after that, for years, with almost no extra effort. Spathoglottis blooms faster, often within three to four months of planting a healthy division.
Repotting and Dividing Ground Orchids
Divide ground orchid clumps every three to four years once they outgrow their space. Spring, right as new growth starts, is the best time for both species. Cut through the root mass with a clean knife, keeping at least three pseudobulbs per division.
Let cut surfaces dry for a few hours before replanting to lower the chance of rot. Water lightly for the first week rather than soaking the new divisions. Most divisions bloom again within one to two growing seasons.
Pests and Problems
Slugs and snails cause the most damage to ground orchid plants, chewing new growth and flower buds at night. Spathoglottis can develop spider mites and anthracnose leaf spot in humid, still air. Good airflow and morning watering cut both risks.
Scale insects occasionally cluster on Spathoglottis stems in greenhouse or indoor conditions. Wipe them off with a damp cloth or treat with insecticidal soap. Check plants monthly during the warm season, since scale spreads fast in still air.
Root and crown rot follow wet, poorly drained soil more often than any pest. If pseudobulbs feel mushy, lift the clump and cut away soft tissue. Replant in fresh, fast draining soil once the cuts callus over.
Wild Terrestrial Orchids
Not every terrestrial orchid grows in a garden bed. Wild species like lady’s slipper orchids root in forest soil, fed partly by soil fungi. Cymbidium and Paphiopedilum also grow terrestrial, but growers usually pot them instead of planting them outdoors.
Those wild fungal partnerships make most native terrestrial species nearly impossible to transplant successfully. Garden centers sell nursery propagated Bletilla and Spathoglottis instead, grown without relying on wild soil fungi. That is a large part of why these two ground orchids succeed in home gardens.
Sources
- North Carolina State University Extension: Bletilla striata plant profile. https://plants.ces.ncsu.edu/plants/bletilla-striata/
- Chicago Botanic Garden: Spathoglottis plicata (Philippine ground orchid) plant finder. https://www.chicagobotanic.org/plant-information/plant-finder/spathoglottis-plicata-philippine-ground-orchid
- University of Florida IFAS Extension: Spathoglottis, a beautiful terrestrial orchid. https://blogs.ifas.ufl.edu/charlotteco/2024/02/12/spathoglottis-a-beautiful-terrestrial-orchid
- American Orchid Society: Orchid glossary, letter S. https://www.aos.org/orchids/orchid-basics/orchid-glossary/orchid-glossary-s
Frequently asked questions
Are ground orchids the same as epiphytic orchids?
No. Ground orchids root in soil while epiphytic orchids cling to tree bark in the wild. That root difference changes potting, watering, and winter care.
Can Chinese ground orchid survive winter outdoors?
Yes, in USDA zones 5 to 9 with a heavy mulch layer. Colder zones do better lifting the pseudobulbs and storing them dry indoors.
How often do ground orchids need water?
Keep the soil damp but never soggy during active growth. Cut back watering once Bletilla goes dormant in fall.
Do ground orchids need shade?
Most do best with morning sun and afternoon shade. Bletilla tolerates more direct sun in cooler climates than Spathoglottis does in the tropics.
Can I grow Philippine ground orchid outside zone 10?
Yes, but only in a container moved indoors before frost. Spathoglottis will not survive an outdoor winter below zone 10.