Fertilising guide
How to fertilise Blunt Greenhood (Pterostylis curta)— schedule & NPK
Also called Blunt Greenhood Orchid, Short Greenhood.
More about blunt greenhood
About Blunt Greenhood
Pterostylis curta · also called Blunt Greenhood Orchid, Short Greenhood · tropical
Pterostylis curta is a charming small terrestrial orchid native to southeastern Australia, producing solitary or few green and white hooded flowers in a distinctive helmet shape. It grows from small underground tubers, becoming dormant in summer. It thrives in cool, damp, well-drained conditions with shade. Pet-safe as an orchid.
Growth habit: Small terrestrial deciduous orchid; rosette of leaves in the growing season, dormant tuber in summer
What fertiliser blunt greenhood actually wants — and why
Blunt Greenhood is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for blunt greenhood: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed blunt greenhood, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For blunt greenhood:
Feed sparingly — a very dilute balanced fertiliser at quarter strength once per month during the autumn-to-spring growing season is sufficient. Excess nutrients cause lush but weak growth and may damage the fine roots. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when blunt greenhood is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for blunt greenhood
Half strength is the safe default for blunt greenhood — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water blunt greenhood first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the blunt greenhood watering schedule.
Signs you are over-feeding blunt greenhood
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for blunt greenhood:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding blunt greenhood
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full blunt greenhood care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of blunt greenhood with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for blunt greenhood
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising blunt greenhood — frequently asked questions
What fertiliser does blunt greenhood need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Blunt Greenhood is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed blunt greenhood?
Feed sparingly — a very dilute balanced fertiliser at quarter strength once per month during the autumn-to-spring growing season is sufficient. Excess nutrients cause lush but weak growth and may damage the fine roots. Feed sparingly — a very dilute balanced fertiliser at quarter strength once per month during the autumn-to-spring growing season is sufficient. Excess nutrients cause lush but weak growth and may damage the fine roots. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for blunt greenhood?
Half strength is the safe default for blunt greenhood — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding blunt greenhood look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding blunt greenhood year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of blunt greenhood?
Flush the pot of blunt greenhood with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Blunt Greenhood care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water blunt greenhood — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise giant timber bamboo
- How to fertilise hedge bamboo
- How to fertilise buddha's belly bamboo
- All 11687 fertilising guides in the Growli library