Growli

Plant care

Trim Greenhood (Neat Greenhood) care

Pterostylis concinna

Also called Trim Greenhood Orchid, Neat Greenhood.

RHS H4USDA 8-10Pet-safeIndoor 10-20 cm tall when in flower

Watering rhythm

5-7days

Lightly moist during active growth (autumn–spring), roughly every 5-7 days

Light

Medium indirect light (a couple of metres from a window)

Soil

Sandy, well-draining woodland mix

Humidity

45-65%

Temp

4-22°C

Pet safety

Pet-safe

Mature size

10-20 cm tall when in flower

Care at a glance

Light

Picture the indirect light an east-facing window gives mid-morning — that's the brightness trim greenhood grows fastest in. Prefers indirect to dappled light through the growing season, replicating coastal scrub and woodland shade. Avoid direct sun. A shaded windowsill or a cool, bright room provides adequate light indoors. You'll know it's right when new leaves come out the same size and colour as the established ones. Smaller, paler new leaves = move closer to the window.

Watering

Aim for lightly moist during active growth (autumn–spring), roughly every 5-7 days for trim greenhood, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Keep the growing medium lightly but consistently moist through autumn, winter, and spring. Allow the surface to dry slightly between waterings. Cease watering once leaves begin to yellow in late spring and keep the medium dry through summer dormancy.

Soil and pot

Trim Greenhood grows best in sandy, well-draining woodland mix. A mix of coarse sand, perlite, and leaf mould or coco coir suits this species well. The mix should drain rapidly while holding a little moisture. Avoid rich, nutrient-loaded composts. Use shallow pots with multiple drainage holes. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Trim Greenhood sits happiest at around 45-65% humidity and 4-22°C (39-72°F). Moderate humidity is appropriate, matching the temperate coastal habitats of this species. Avoid very dry, heated rooms in winter when the plant is actively growing. Good air movement is important. If you keep the room above 4 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed trim greenhood sparingly. Feed sparingly — a very dilute quarter-strength balanced fertiliser once every 4-6 weeks during the growing season (autumn to spring) is sufficient. This species grows in naturally low-nutrient soils; excess feeding is counter-productive. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on trim greenhood in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Tuber rot during dormancyWatering through the summer dormancy quickly causes tuber death. Keep dry and in a warm location from late spring until new shoots appear in autumn.
  • Slug predationEmerging rosettes in autumn are highly vulnerable to slug and snail damage. Protect with organic pellets or copper barriers immediately.
  • Fungus gnatsMoist, fine woodland mix attracts fungus gnats. Allow the top layer to dry slightly between waterings and use yellow sticky traps if adults appear.
  • Over-pottingGrowing in too large a pot causes the medium to stay too moist. Use the smallest pot that comfortably accommodates the tubers.
  • Failure to produce offsetsPlants that do not increase may be growing too warm, too wet, or in nutrient-rich soil. Replicate lean, cool, dry summer conditions to maximise tuber division.

Companion plants

Trim Greenhood pairs well with Pterostylis nutans, Pterostylis curta, Caladenia, and Corybas. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Separates naturally into multiple daughter tubers during the growing season. After dormancy begins in late spring, carefully dig and separate the offset tubers and replant each in individual pots of fresh, gritty woodland mix before autumn growth commences. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Trim Greenhood is pet-safe. Not individually listed by the ASPCA; the Orchidaceae family is broadly recognised as non-toxic to cats and dogs, and Pterostylis belongs to this family. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Trim Greenhood care — frequently asked questions

What is the common name for Pterostylis concinna?

Pterostylis concinna is most commonly called Trim Greenhood, but it is also known as Trim Greenhood Orchid, Neat Greenhood. The names refer to the same species, so care instructions for Trim Greenhood apply identically to anything sold as Neat Greenhood.

How much light does trim greenhood need?

Trim Greenhood grows best in medium indirect light (a couple of metres from a window). Prefers indirect to dappled light through the growing season, replicating coastal scrub and woodland shade. Avoid direct sun. A shaded windowsill or a cool, bright room provides adequate light indoors.

How often should I water trim greenhood?

Water trim greenhood lightly moist during active growth (autumn–spring), roughly every 5-7 days. Keep the growing medium lightly but consistently moist through autumn, winter, and spring. Allow the surface to dry slightly between waterings. Cease watering once leaves begin to yellow in late spring and keep the medium dry through summer dormancy. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is trim greenhood toxic to cats and dogs?

Trim Greenhood is pet-safe. Not individually listed by the ASPCA; the Orchidaceae family is broadly recognised as non-toxic to cats and dogs, and Pterostylis belongs to this family.

What USDA hardiness zone does trim greenhood grow in?

Trim Greenhood is rated for USDA zone 8-10 (cool greenhouse or outdoor in mild temperate zones) and RHS hardiness H4. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Trim Greenhood deep-dive guides

Every aspect of trim greenhood care, each with its own calibrated guide:

Featured in these plant shortlists

Trim Greenhood qualifies for 11 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

  • Best pet-safe houseplantsHouseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
  • Best low-light houseplantsHouseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
  • Best plants for a north-facing windowHouseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
  • Best pet-safe low-light plantsNon-toxic to cats and dogs AND happy with no direct sun — the two hardest constraints to satisfy at once.
  • Best plants for cold, dark roomsHouseplants that cope with BOTH low light and a cool, unheated room — the hardest indoor spot to fill. Every pick tolerates a low of about 10°C and shade.
  • Best small & tabletop houseplantsCompact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
  • Best houseplants for a cool roomHouseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
  • Best pet-safe bedroom plantsNon-toxic to cats and dogs and happy in lower light — calming greenery for a bedroom where a pet often sleeps too.
  • Best cat-safe plantsHouseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
  • Best dog-safe plantsHouseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
  • Best small pet-safe plantsCompact, tabletop houseplants that are also ASPCA non-toxic to cats and dogs — safe greenery for a desk or shelf.
  • Browse all 30 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Trim Greenhood is also commonly called Trim Greenhood Orchid or Neat Greenhood.