Propagation
Sow fresh seeds during early spring and pre-soak in heated water 13º to 18ºC (55º-64ºF) for 24 hours. The seeds may require scarification.

Note:
In cold climates this cycad is grown in a conservatory or glasshouse and is planted in deep pots with equal parts of loam and coarse sand with some granulated bark and the addition of slow-release fertiliser. It should be placed in a bright filtered light, humid position and watered regularly during summer.

Botanic information
Leaf: The large not keeled arching pinnate fronds are up to 3 m (9 ft) long. They are composed of 150 to 250 lax linear glossy dark green leaflets that are up to 200 mm (8 in) long by 10 mm (⅜ in) wide and are arranged on a single plain along the rachis. The fronds are arranged in a whorl and have a spiny petiole up to 100 mm (4 in) long and there are up to 120 in the crown.

Flower: The cycad is dioecious and the greenish fusiform male (pollen) cone is up to 400 mm (16 in) long by 100 mm (4 in) in diameter and the ovoid female (seed) cone is up to 650 mm (28 in) long by 180 mm (7 in) in diameter and appearing towards the top of the plant during summer.

Fruit: The flattened red seeds are 55 mm (2⅛ in) long and are arranged in a spiny ovoid cone that is up to 650 mm (28 in) long by 180 mm (7 in) wide. The seeds contain a starchy endosperm, which contain poisonous glycosides and are lethal to humans and livestock.