Troubleshooting
Trim Greenhood problems — and how to fix them
Trim Greenhood (Pterostylis concinna) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Tuber rot during dormancy
Watering 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 predation
Emerging rosettes in autumn are highly vulnerable to slug and snail damage. Protect with organic pellets or copper barriers immediately.
Fungus gnats
Moist, fine woodland mix attracts fungus gnats. Allow the top layer to dry slightly between waterings and use yellow sticky traps if adults appear.
Over-potting
Growing in too large a pot causes the medium to stay too moist. Use the smallest pot that comfortably accommodates the tubers.
Failure to produce offsets
Plants 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.
Prevent trim greenhood problems before they start
Most trim greenhood issues are care-mismatch, not bad luck. Dial in the basics:
Trim Greenhood problems — FAQ
Why is my trim greenhood tuber rot during dormancy?
Watering through the summer dormancy quickly causes tuber death. Keep dry and in a warm location from late spring until new shoots appear in autumn.
Why is my trim greenhood slug predation?
Emerging rosettes in autumn are highly vulnerable to slug and snail damage. Protect with organic pellets or copper barriers immediately.
Why is my trim greenhood fungus gnats?
Moist, fine woodland mix attracts fungus gnats. Allow the top layer to dry slightly between waterings and use yellow sticky traps if adults appear.
Why is my trim greenhood over-potting?
Growing in too large a pot causes the medium to stay too moist. Use the smallest pot that comfortably accommodates the tubers.
Why is my trim greenhood failure to produce offsets?
Plants 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.