The Corynocarpus laevigata or corinocarpo is an evergreen plant native to New Zealand; in nature it is a small tree, which reaches 7-8 meters in height, in a container it remains below 180-200 cm. It has a gray-green, smooth, very branched trunk and pyramidal crown; the leaves are quite large, 15-20 cm long, dark green, smooth, thick and leathery; the "variegated" variety has glossy leaves with a variegated green color and creamy white. In nature Corinocarpo produces small panicles of yellowish flowers, followed by orange fruits, which are hardly seen on the specimens grown in the apartment.
For the cultivation of Corynocarpus laevigata it is advisable to place the plant in a very bright place, but not directly exposed to sunlight, especially when the days are hot and they are stronger because, with their intensity, they could cause problems to the plant; in spring the corinocarp can be placed outside, in a partially shaded and well-ventilated place, in winter the plant should be stored in a protected place, especially if the outside temperatures are rather cold. If there is no room for placement indoors, it is advisable to use special protective sheets to prevent the corinocarp from feeling intense cold. The ideal temperature should not fall below 10 ° C.
To get good results from Corynocarpus laevigata, from March to September, it is good to water regularly, avoiding excesses and letting the soil dry well between one watering and another; in the winter months slightly decrease the watering, supplying water sporadically every 20-30 days, often vaporizing the leaves, with demineralized water if the specimens are inside; outside it is good not to intervene in this way, especially when the climate is rather cold. In the vegetative period, provide fertilizer for green plants, every 15-20 days, mixed with the water used for watering.
For the planting of this type of plant, use balanced, rich and soft universal soil, possibly mixed with pumice stone or perlite, to increase drainage; another useful element for drainage is the sand that can be mixed with peat and soil to have a compound with good properties. For a correct development of the corynocarpus it is advisable to repot it every 2-3 years, slightly increasing the diameter of the container, so that the roots have enough space for a better development.
In the places of origin the multiplication of these plants generally occurs by seed, using the seeds as soon as the fruits are ripe; usually the seeds of corynocarpus are difficult to find in Europe, where this plant is propagated by cuttings, in autumn, keeping the cuttings in a sheltered and covered place during the cold season.
Corinocarpus - Corynocarpus laevigata: Pests and diseases
Conditions of poor aeration and low humidity can favor the attack of cochineal and mites. Excessive humidity, on the other hand, can lead to the onset of radical rot that can cause the death of the plant itself; for this reason, it is good to carefully check that the soil is sufficiently drained to avoid the formation of water stagnation.