The genus Corokia has four species of evergreen shrubs, originating in New Zealand. Usually, they are medium in size and do not exceed 2-3 meters in height; they are used as single specimens or in hedges, since they do not fear even drastic pruning.
The foliage is small, glossy and leathery, usually bright green, gray or white on the underside, oval or lanceolate; during the autumn months many species and cultivars take on an orange or bronze color. In late spring they produce numerous small, very fragrant, golden-yellow, star-shaped flowers, followed by oval berries, the size of small olives, orange or red, which remain on the plant for weeks. C. cotneaster is also used as bonsai, C. buddlejoides and C. virgata have silver gray foliage, very decorative.
The plants of this genus prefer sunny locations, but possibly partially shady during the hottest hours of the day, especially in summer; they can withstand temperatures close to -7-8 ° C, but in areas with very cold winters it is advisable to place them in a place sheltered from the wind. They can withstand even in environments not ideal for them, but their development will be modest and the plants will not be luxuriant.
The watering of the Corokia does prepared according to the period; from March to October it is advisable to water quite regularly, always waiting for the soil to dry completely between one watering and another; avoid leaving the soil dry or soaked for a long time; during the cold season water only in case of prolonged periods of drought. It is important to avoid water stagnation which could cause the base of the plant to rot.
Corokia plants prefer loose soils, rich in organic matter and very well drained; let's avoid planting in excessively gravelly and dry soil or in very heavy and compact soil. An important factor for the correct development of the plant is to check that the soil has a correct degree of humidity, verifying that the earth is not too dry and compact and, at the same time, is not water soup, a factor that could accelerate the appearance of problems and infections from fungi or root rot.
The multiplication of this variety of plants occurs by seed in the spring, but this method of propagation often does not give the desired results, since most of the corokies spread on the market are hybrids and therefore from seed not always plants are obtained identical to the mother plant; for this reason the corokia is generally propagated by semi-woody cutting, in autumn.
Corokia: Pests and diseases
Corokia plants are quite resistant but can be affected by pests and diseases that undermine their health. These plants fear scab, rust and aphids, which often attack young leaves and buds. In case of onset of diseases and parasites it is advisable to intervene promptly, using solutions that lead to definitive results, so that the plant can grow in health. Numerous products are available on the market that can help solve these problems effectively.