Repotting guide

When & how to repot Blunt Greenhood (Pterostylis curta)

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.

Mature size: 10-20 cm tall when in flower

Watch for — Slug and snail damage: Tender emerging leaves in autumn are very attractive to slugs. Use physical barriers or organic pellets around pots.

How to tell blunt greenhood needs repotting

Repotting on a calendar is less reliable than reading the plant. For blunt greenhood, watch for these signs:

Flowering has tailed off year on year and the clump has become congested and overcrowded.
Lots of leaf and few flowers — a classic sign that blunt greenhood bulbs or tubers need lifting and dividing.
Bulbs visibly bursting the pot or pushing each other to the surface.
It is the natural dormancy window (foliage yellowed and died back) — the only safe time to lift and split.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot blunt greenhood

Lift and divide every 3–4 years once clumps congest. Rather than a true repot, blunt greenhood is lifted and divided once the clump congests and flowering drops off. Small terrestrial deciduous orchid; rosette of leaves in the growing season, dormant tuber in summer.

What size pot to step blunt greenhood up to

Pot size matters less than depth and spacing here. When you replant blunt greenhood, set the bulbs or tubers at the correct depth (a rough guide: two to three times their own height of soil over the top) and space them so they are not touching. A wide, shallow pot suits a clump better than a tall narrow one.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot blunt greenhood

The only safe window is dormancy: wait until the foliage has yellowed and died back naturally, lift and divide then, and replant before or at the start of the next growing season. Disturbing blunt greenhood in full growth or flower sets it back badly.

Step-by-step: repotting blunt greenhood

Wait for dormancy. Let blunt greenhood foliage yellow and die back completely. Lifting while it is in growth wastes the energy it is storing for next year.
Lift carefully. Loosen the soil well away from the bulbs/tubers with a fork and ease the whole clump out without spearing them.
Separate the offsets. Gently pull the clump apart into individual bulbs or tubers. Keep only firm, healthy, blemish-free ones.
Replant at the right depth. Reset them in fresh free-draining sandy loam with added leaf mould at the correct depth and spacing — not touching — so each has room to bulk up.
Water in and rest. Water once to settle them, then keep on the dry side until growth resumes. Do not feed until leaves are actively growing.

Aftercare

After replanting blunt greenhood, keep the soil barely moist — not wet — until shoots appear; bulbs and tubers rot in cold, saturated soil. Once leaves are growing strongly, resume normal watering. Hold off feeding until the plant is in active growth again.

The right soil mix for blunt greenhood

Blunt Greenhood wants free-draining sandy loam with added leaf mould. A gritty, well-draining mix replicating Australian woodland soils is best — coarse sand or fine grit mixed with leaf mould or coco coir. Avoid rich composts or peat-heavy mixes. Shallow pots match the shallow root system. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting blunt greenhood — frequently asked questions

How often should you repot blunt greenhood?

Lift and divide every 3–4 years once clumps congest for blunt greenhood. Blunt Greenhood is lifted and divided, not "repotted". Every 3–4 years, once the foliage has died back and it is dormant, lift the clump, separate the offsets, and replant at the correct depth in free-draining sandy loam with added leaf mould. Crowding, not pot size, is what reduces flowering over time.

What size pot does blunt greenhood need?

When is the best time of year to repot blunt greenhood?

Do you "repot" blunt greenhood, or lift and divide it?

You lift and divide it. Blunt Greenhood grows from bulbs or tubers, so instead of repotting you wait for dormancy, lift the congested clump, separate the healthy offsets, and replant them at the right depth and spacing. Doing this every 3–4 years restores flowering.

Should you fertilise blunt greenhood after repotting?

Hold off feeding blunt greenhood until it is in active growth again. Fresh soil already carries enough nutrients to get it re-established, and feeding disturbed roots too soon does more harm than good.