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Species library › Macrozamia › Macrozamia johnsonii
Other Partly documented

Macrozamia johnsonii

A large cycad endemic to northeastern New South Wales. It grows in open eucalypt forest in a small area west of Grafton, and is listed as Least Concern. It is slow, hardy and sun-tolerant, and needs good drainage, summer water and a cool winter.

Macrozamia johnsonii
Photo: Polihale (talk), CC BY-SA 3.0, via Wikimedia Commons
At home, aim for
Day Cool-growingTargets in Plantistry
Night Close to the dayTargets in Plantistry
Humidity Dry airBand in Plantistry
Light Bright, filtered lightDLI and PPFD in Plantistry
Expects a seasonal restGrows in the ground

Where it grows wild

Inferred from the genus and the records: open eucalypt forest and woodland on well-drained slopes, under a broken canopy.

The records are at about 500 m, with one at about 805 m.

New South Wales

🔒 Growing it like that

The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:

✓ Day and night temperature targets, and the limits it tolerates
✓ Humidity band, and how to hold it
✓ Light as DLI and PPFD for a grow light
✓ Wet and dry seasons, and whether to rest it
✓ Substrate and airflow
✓ A step-by-step setup to grow it like the wild

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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY-SA 3.0 licence, unmodified.