Cycas cairnsiana, known as Mount Surprise Sago, is a cycad from dry, rocky woodland in northern Queensland, Australia. It is grown for its striking blue-green foliage and needs sun, fast-draining soil and dry periods between waterings.
Family
Cycadaceae (Cycad family)
Grows as
Tree, Shrub
Light
Full sun
Water
Water deeply during the wet season and let the soil dry out between waterings; cut back in winter.
Soil
Free-draining, gritty mix or sandy, granite-derived soil.
Temperature
18–35 °C; protect below 5 °C
How easy
Moderate
Safety
Toxic: All parts, especially seeds, contain toxins that cause vomiting and liver damage if eaten.. Toxic to cats and dogs (ASPCA).
Native range
Queensland (Newcastle Range)
Climate
seasonally dry tropical
About
Cycas cairnsiana is a species of cycad in the genus Cycas, native to northern Australia in northern Queensland on the Newcastle Range.
The stems grow to 2–5 m tall and 12–16 cm diameter, with swollen base. The leaves are dark orange-brown tomentose on emerging, then glaucous blue-green and glabrous with age, 60–110 cm long, bowed, keeled, pinnate, with 180-220 leaflets, the leaflets 8–18 cm long and 2–4 mm wide. The petioles are 18–27 cm long, and armed with sharp spines.
Where it grows
It grows in dry, rocky, and open woodland terrain on soils derived from granite. Its range is limited to the Newcastle Range of northeast Queensland, with seasonal rainfall of about 1350 mm. This cycad is a close relative of both Cycas couttsiana and Cycas platyphylla. The plants are remarkable for their intense blue colour, and their resilience to the seasonal extremes of their native range. Its conservation status is near-threatened.
Text excerpted from the Wikipedia article Cycas cairnsiana by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.