Armidale, New South Wales — elevation 980 m on the Great Dividing Range — records an average of 100 frost nights per year, snow on two days annually, and an absolute minimum temperature of −9.3 °C. It is not the place you would expect to find a cycad. Yet Macrozamia montana grows on the steep ridges and mountain slopes of the ranges between the Manning River Valley and the Macleay River Valley, in country that extends to within striking distance of these frost-hollowed tablelands. This is the mountain cycad — named montana (Latin: “of the mountains”) by Ken Hill in 1998, when he separated it from the broad Macrozamia communis umbrella and recognised it as a distinct species adapted to the cooler, higher-altitude environments of the northeastern NSW ranges.
Until 1998, Macrozamia montana was simply part of M. communis, and in cultivation it still resembles a smaller version of that widespread coastal species. But the differences are real: a petiole armed with spines almost to its base (vs. spine-free for at least 15 cm in M. communis), female cones that droop to a horizontal position or rest on the ground as they mature (a trait unique among NSW Macrozamia), and a montane ecology that endows it with cold hardiness that may exceed any other species in the genus. It belongs to the genus Macrozamia — the largest exclusively Australian cycad genus, with around 40 species — and for European growers in frost-prone climates, this overlooked mountain species may be the most interesting of all.
Quick Facts
| Scientific name | Macrozamia montana K.D.Hill |
| Family | Zamiaceae |
| Origin | NE New South Wales, Australia (Manning River–Macleay River ranges) |
| Adult size | Usually subterranean trunk (occasionally short emergent); up to 70 fronds, 1–2 m long |
| Hardiness | −5 to −7 °C (23 to 19 °F) — potentially more / USDA zones 9a–11 |
| IUCN | Not Evaluated (NE) |
| CITES | Appendix II (all cycads) |
| Cultivation difficulty | 2/5 |
Taxonomy and Nomenclature
Macrozamia montana was described by Ken Hill in 1998 in the Flora of Australia (48: 717). It was segregated from Macrozamia communis, under whose umbrella it had previously been placed. The separation was part of Hill’s broader revision of the M. communis complex, which also recognised Macrozamia reducta (Hill & Jones, 1998) as a distinct species.
Etymology: from the Latin montanus, “of the mountains” — referring to its characteristic habitat on mountain slopes and steep ridges.
Relationships: Macrozamia montana is most closely related to the larger southern forms of Macrozamia communis (south coast NSW), rather than to the generally smaller coastal plants north of Newcastle. The two species belong to section Macrozamia. M. montana is geographically isolated from other Macrozamia species in the wild, and hybrids are not known.
In Hill’s key to the genus, the diagnostic character separating the two species is the petiole: in M. communis, the petiole is spine-free for at least 15 cm; in M. montana, the petiole is spinescent almost to the base — the lower leaflets reduced to spines extending nearly to the point of attachment.
Common names: no established common name; sometimes informally called the Mountain Burrawang.
Morphological Description
Macrozamia montana is a medium to large, dioecious, evergreen cycad of section Macrozamia.
Trunk: normally a subterranean caudex, though sometimes producing a short emergent trunk. Similar in overall habit to M. communis but on average somewhat smaller — described by Dave’s Garden as “a smaller to nearly medium sized plant with upright leaves that looks a lot like a smaller version of Macrozamia communis.”
Leaves: up to 70 per crown, 100–204 cm long, glossy. Young fronds emerge bright green, maturing to dark green and arching with age. Petiole short (6–15 cm) and critically — spinescent almost to the base. This is the key diagnostic character: the lower leaflets are reduced to spines that extend nearly to the petiole attachment, whereas in M. communis there is always a spine-free zone of at least 15 cm.
Leaflets: similar to M. communis — thick, rigid, dark green, with the characteristic Macrozamia white callous at the base. Sporophyll-spines on the female cones are notably elongated.
Cones:
- Male cones: 1–4 per plant.
- Female cones: 1–2 per plant, up to 28 cm long and 16 cm in diameter. Individual sporophylls are slightly longer and wider than those of M. communis, with elongated spines. The peduncle (cone stalk) is unusually long — up to 24 cm.
A unique cone behaviour: as female cones mature, they have a marked tendency to move from an almost perpendicular position to a horizontal position, sometimes resting entirely on the ground. This procumbent cone posture is distinctive among NSW Macrozamia species and appears to result from the combination of the cone’s weight and the unusually long peduncle, which cannot support the cone as it gains mass. The ecological significance is unclear, but it may facilitate seed access for ground-dwelling mammals.
Seed dispersal — an unusual marsupial behaviour: PACSOA reports that marsupials (kangaroos, possums) feeding on M. montana seeds sometimes remove sporophylls from the basal section of the cone before it has begun to disintegrate — actively pulling apart the cone to access the seeds, rather than waiting for natural disintegration as they do with most other Macrozamia species. This suggests a more aggressive feeding interaction, possibly driven by the cones’ accessible horizontal position.
Similar Species and Common Confusions
| Character | Macrozamia montana | Macrozamia communis | Macrozamia reducta |
|---|---|---|---|
| Petiole | Spinescent almost to base | Spine-free for ≥15 cm | Variable |
| Fronds per crown | Up to 70 | 50–100+ | Fewer, smaller |
| Leaf length | 100–204 cm | 70–200 cm | Shorter |
| Female cone position | Procumbent (horizontal/ground) | Erect then drooping | Erect |
| Peduncle length | Up to 24 cm (long) | Shorter | Shorter |
| Habitat | Montane — steep ridges, slopes | Coastal — sandy soils, lowlands | Various |
| Distribution | Manning–Macleay ranges | Taree–Bega coast | Restricted |
The key diagnostic is the petiole. Pick up a frond and look at how far down the spiny reduced leaflets extend: if they reach almost to the base of the petiole, the plant is M. montana; if the basal 15+ cm is smooth and spine-free, it is M. communis. This character is stable across populations and is reliable in cultivation.
There is also a north–south size gradient within M. montana: plants in the far south of the distribution range (Mt George area) are generally more robust than those in the northern sections near the Kempsey–Armidale Road.
Distribution and Natural Habitat
Macrozamia montana is endemic to northeastern New South Wales, in an area between the southern parts of the Manning River Valley and the northern parts of the Macleay River Valley. The distribution extends from the Mt George region in the south to areas adjoining parts of the Kempsey–Armidale Road in the north. This places it in the hilly to mountainous terrain of the Great Dividing Range escarpment and its associated ranges.
The species grows on the sides of steep ridges and mountain slopes — the montane habitat that gives it its name. It occurs in eucalypt woodland and open forest, on well-drained, often rocky soils.
Climate in the native range:
| Parameter | Manning–Macleay ranges (NE NSW tablelands) |
|---|---|
| Mean annual temperature | 13–18 °C |
| Mean winter minimum | 1–6 °C |
| Frost days per year | 34–100 (depending on altitude) |
| Historical absolute minimum | −9.3 °C (Armidale, at the extreme of the range) |
| Snow | 2 days/year average at higher elevations |
| Maximum temperature | Rarely exceeds 35 °C (record: 36.5 °C at Armidale) |
| Annual rainfall | 700–900 mm (spread over ~80 rain days) |
| Köppen classification | Cfb (oceanic / warm-temperate) |
This is a cool, montane climate — significantly colder and more frost-prone than the coastal habitat of M. communis. The combination of 34–100 frost nights, occasional snow, and an absolute minimum of −9.3 °C makes the M. montana habitat one of the coldest environments occupied by any Macrozamia species. Whether the plants themselves endure the full −9.3 °C is uncertain — they likely occupy sheltered microsites on steep slopes where cold air drains away — but the species is unquestionably adapted to a climate with severe, prolonged winter cold.
Conservation
Macrozamia montana has not been formally evaluated by the IUCN. Within its range, it appears to be reasonably common on suitable montane sites. The geographic isolation from other Macrozamia species means that hybridisation is not a concern. The primary threats are likely habitat clearing and altered fire regimes, as for other NSW Macrozamia species.
Cultivation
| Hardiness | −5 to −7 °C (23 to 19 °F) — potentially more / USDA zones 9a–11 |
| Light | Full sun to partial shade |
| Soil | Well-drained; tolerates rocky, nutrient-poor montane soils |
| Watering | Regular; moderate drought tolerance once established |
| Adult size | Rosette 0.8–1.5 m tall; up to 70 fronds |
| Growth rate | Slow |
| Difficulty | 2/5 |
Macrozamia montana is not widely known in cultivation — Dave’s Garden describes it as “not very common in cultivation” — but the few growers who have trialled it report that it is easy-going in full sun and slow growing. Its primary interest for European and North American growers lies in its potential cold hardiness.
Cold hardiness — the key selling point: this is potentially the most cold-hardy species in the genus Macrozamia. The native range experiences 34–100 frost nights per year, with absolute minima reaching −9.3 °C at the extremes. The subterranean caudex provides excellent thermal insulation. While the plants almost certainly occupy sheltered microsites and do not personally experience the full Armidale minimum, USDA zone 9a is a conservative minimum for permanent outdoor planting — and there is good reason to believe this species could tolerate zone 8b in well-drained, sheltered positions. However, we apply the standard half-zone safety margin and recommend zone 9a as the baseline, with the caveat that careful experimentation in zone 8b may be rewarding for adventurous growers with well-drained, slope-positioned sites where cold air drains away. For European Mediterranean gardens prone to occasional severe winters (1956, 1985, 2012-type events), M. montana is a safer choice than any subtropical Macrozamia species.
Light: full sun to partial shade. In habitat it grows on open, sun-exposed steep slopes.
Soil: well-drained, rocky, nutrient-poor soils — the species is adapted to montane conditions. In cultivation, sandy or gravelly substrates work well.
Watering: regular during the growing season. The native range receives 700–900 mm, reasonably distributed — neither the extreme drought of M. macdonnellii nor the high moisture of M. johnsonii.
Container culture: well suited, particularly for growers who want to test the species’ cold tolerance by moving containers to increasingly exposed positions over successive winters.
Buying Advice
Availability: Macrozamia montana is rare in the international trade. It is not commonly offered by specialist nurseries outside Australia, and even within Australia it is less frequently available than M. communis or M. miquelii. Seeds may be obtainable from specialist collectors. Given the potential cold-hardiness interest, demand may increase as European and North American cycad growers become aware of the species. Ensure plants are nursery-propagated — wild collection is illegal.
Identification: verify the petiole character: spinescent almost to the base = M. montana; spine-free basal zone ≥15 cm = M. communis. Provenance: Manning–Macleay ranges (montane NE NSW) = M. montana; coastal NSW = M. communis.
Propagation
Seed: the only method. Clean the sarcotesta (gloves — toxic), sow in well-drained mix at 25–30 °C. No pretreatment. Germination and growth are slow.
Pests and Diseases
Scale insects and mealybugs: the usual Macrozamia pests. Manageable with horticultural oil.
Root rot: in waterlogged soils — particularly problematic in winter in cooler climates.
Toxicity: all parts are highly toxic. The same cycasin/macrozamin warnings as for all Macrozamia species.
Landscape Use
Macrozamia montana is the cycad for cold gardens. In Mediterranean Europe, where most arborescent cycads require sheltered positions or winter protection, this montane species — shaped by a climate with 100 frost nights and occasional snow — offers the possibility of growing a Macrozamia in positions that would be too risky for M. miquelii, M. moorei, or even M. communis. Use it as a specimen on a well-drained slope (mimicking its natural habitat — cold air drainage is key), in a rockery, or as part of a hardy cycad collection alongside M. communis and other frost-tolerant species. The upright, glossy dark green fronds give it a neat, architectural presence. The procumbent female cones — lying horizontally on the ground — are an unusual feature that adds character. For gardeners in zone 9a who have always wanted to grow a Macrozamia but feared the cold, M. montana is the species to try.
Frequently Asked Questions
How does Macrozamia montana differ from Macrozamia communis?
The key diagnostic is the petiole: in M. montana, the lower leaflets are reduced to spines extending almost to the base of the petiole; in M. communis, the basal 15+ cm of the petiole is spine-free. Additionally, M. montana grows on mountain slopes (not coastal lowlands), has smaller frond numbers (up to 70 vs. 100+), and produces female cones that droop to a horizontal position.
Is this really the most cold-hardy Macrozamia?
Possibly. The native range includes some of the coldest environments occupied by any Macrozamia — with 34–100 frost nights per year and an absolute minimum of −9.3 °C recorded at Armidale. Whether individual plants endure the full extremes of this climate (or occupy sheltered microsites) is uncertain, but the species is clearly adapted to severe, prolonged winter cold. For permanent outdoor planting, USDA zone 9a is a safe minimum; adventurous growers in zone 8b may succeed on well-drained slopes.
Why is it so rare in cultivation?
It was only described in 1998 and has a restricted natural range. Few seeds have entered the international horticultural trade. As awareness of its potential cold hardiness grows, this may change.
Authority Websites and Databases
POWO — Plants of the World Online (Kew)
https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:1012672-1
Accepted species. First published in Fl. Australia 48: 717 (1998). Native range: NE New South Wales.
World List of Cycads — cycadlist.org
https://cycadlist.org/scientific_name/
Accepted species. K.D. Hill, 1998.
PACSOA — Palm and Cycad Societies of Australia
https://pacsoa.org.au/wiki/index.php/Macrozamia_montana
The most detailed account. Section Macrozamia, subterranean caudex or short emergent trunk. Manning River Valley to Macleay River Valley (Mt George to Kempsey–Armidale Road). Segregated from M. communis 1998. Female cones procumbent (horizontal), peduncle to 24 cm. Sporophylls slightly larger than M. communis, spines elongated. Marsupials actively dismantling cones. North–south size gradient. Armidale climate data: −9.3 °C record, 34–100 frost nights, 2 snow days/year.
Hill’s key to Macrozamia
In: Flora of Australia 48 (1998) / LON-CAPA Macrozamia key
Diagnostic couplet: “Petiole spine-free for at least 15 cm → M. communis” vs. “Petiole spinescent almost to base → M. montana.”
Bibliography
Hill, K. D. (1998). Cycadophyta. Flora of Australia, 48, 597–661 (including M. montana at p. 717).
Jones, D. L. (2002). Cycads of the World (2nd ed.). New Holland Publishers, Sydney.
Whitelock, L. M. (2002). The Cycads. Timber Press, Portland.