Photo: Stephen ThorpeCC BY 4.0via iNaturalistresized / cropped
Green Onion Orchid Plant Care
Pterostylis graminea Hook.f.
Updated · Sources · How we source care data
Pterostylis graminea, also known as the Grass-leaved Greenhood, is a unique orchid species known for its slender, grass-like leaves and intricate green and white flowers. This plant is native to Australia and can be found growing in shady woodlands or open forests.
Every 7–10 days
Bright indirect light
60–75°F
50–70%
At a glance
How do you care for Green Onion Orchid?
Water Green Onion Orchid every 7–10 days, letting the top layer of soil dry out between waterings, and give it bright indirect light. It prefers temperatures of 60–75°F (16–24°C) and 50–70% humidity. Fertilize it every month during the growing season.
Where Is the Green Onion Orchid Native To?
What Is the Green Onion Orchid?
Green Onion Orchid (Pterostylis graminea) belongs to the Orchidaceae family within the Pterostylis genus. Green Onion Orchid is native to New Zealand. Green Onion Orchid is also known as Grass Greenhood.
Green Onion Orchid displays a low rosette, clumping growth habit, reaching up to tall with a spread of approximately . Green Onion Orchid produces unique, intricate orchid-like flowers.
Leaf size: approximately 4 inches.
How Often Should You Water a Green Onion Orchid?
Pterostylis graminea requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Green Onion Orchid Need?
Green Onion Orchid thrives in bright indirect light. Avoid placing Green Onion Orchid in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Bright indirect light
What Temperature and Humidity Does the Green Onion Orchid Prefer?
Pterostylis graminea grows best at temperatures of 60–75°F. Green Onion Orchid prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
60–75°F
Humidity
50–70%
What Soil Mix Works Best for a Green Onion Orchid?
Well-draining orchid mix with bark and perlite. Good drainage is essential for Green Onion Orchid to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Green Onion Orchid?
Feed Green Onion Orchid every month during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every month
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Green Onion Orchid?
Repot every 1-2 years after flowering. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Green Onion Orchid?
Green Onion Orchid can be propagated through division, seed sowing. Similar propagation techniques also apply to abrupt greenhood plant care, which shares the same genus.
Is the Green Onion Orchid Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Green Onion Orchid, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Green Onion Orchid?
Green Onion Orchid is susceptible to aphids, spider mites, scale insects. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Green Onion Orchid Need?
Green Onion Orchid grows outdoors in USDA Zone 8b – 10b. It survives winters down to planting zone 8b. Green Onion Orchid is native to New Zealand.
Hardiness Zone
Zone 8b – 10b
Keep exploring plants
Green Onion Orchid is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Pterostylis genus — compare its care with other Pterostylis species on PlantoScan.
Pterostylis is part of the Orchidaceae plant family — browse all Orchidaceae genera and species.
Green Onion Orchid thrives in bright light and direct sun — see other bright-light plants.
More Pterostylis Species
Other Pterostylis species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Pterostylis graminea Hook.f., family Orchidaceae (first published in Fl. Nov.-Zel. 1: 248 (1853)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Green Onion Orchid, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: Stephen Thorpe, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 8b – 10b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
Identify Plants Like the
Green Onion Orchid Instantly
Scan any plant with your phone camera and get instant ID, care tips, water and fertilizer reminders, and health checks — all in one app.
Free
to download
iOS & Android
platforms
Light & dark
mode
100,000+
species