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The family of luciferous. Homeland - tropical and subtropical regions of South Asia (Korea, China) and Africa. In nature, according to various sources, there are from 150 to 400 species. Shrubs and fawn predominate among clerodendrum, but small trees are also found. The leaves and stems of many types of clerodendrum usually have pubescence - these are short glandular, scaly or stellate hairs. Also in many species on the underside of the leaves along the central vein there are extra-flowered nectaries. They bloom incredibly beautifully, attracting all kinds of insects - bees, butterflies and birds, but many species do not have a scent. Indoors they bloom in spring or summer.
Clerodendrum thomsoniae is one of the most common species - evergreen liana, its shoots in nature reach 4 m in length. Leaves are opposite, oval or ovoid, 10-17 cm long and 4-7 cm wide. The leaf surface is slightly wrinkled, with pronounced venation. Flowers in racemose inflorescences from 8 to 20, with a white swollen calyx and a red corolla about 2.5 cm in diameter. Moreover, at the end of flowering, the corolla falls off before the calyx. There are varieties with yellow-green leaves.
Clerodendrum brilliant Clerodendrum splendens is a climbing or erect shrub with very large oval or rounded leaves, pointed at the end, up to 20 cm long. Flowers about 3 cm in diameter are collected in multiflorous thyroid inflorescences, emerging from the leaf axils. The calyx of the flower is bell-shaped, green, and the corolla is red, with the same red long stamens.
Clerodendrum chinense is a small shrub, in nature about 2-3 m in height, with wide ovoid leaves, slightly pointed at the edge. Leaves and petioles are finely pubescent. Flowers are white or pink, usually double, with a slight aroma, collected in corymbose inflorescences, often double, like miniature roses. Synonym Clerodendrum fragrans.
Clerodendrum Wallichii is a low shrub, in nature 2-4 m in height. Leaves are dark green glossy. Oblong in shape, pointed at the end and wavy at the edge. The characteristic wrinkled surface and tetrahedral stems are characteristic features of clerodendrum. The flowers are white, collected in drooping racemose inflorescences. Petals are ovoid, 1.2-1.5 mm long, slightly bent back. The stamens and pistil are about twice the length of the petals.
Clerodendrum paniculatum Clerodendrum paniculatum - This species is somewhat different from others. First of all, unlike the rest of the above species, originating from West Africa, the homeland of Clerodendrum paniculate is India, Sri Lanka and Malaysia. Secondly, it is an upright shrub, not a liana. Its stems are almost square in cross section. The leaves are large, the lower ones are lobed, 3-5 lobes in outline, the upper leaves are whole. Inflorescence on an erect peduncle, pyramidal, pagoda-shaped, can reach 45 cm in length. Flowers with petals and stamens of the same color, can be pink, white, yellow, red. The flowers of cultivated plants are usually sterile and therefore do not form fruit.
Clerodendrum ugandan Clerodendrum ugandense - no longer belongs to the genus Clerodendrum, this plant has the name Roteca myrikovy Rotheca makanjana.
Clerodendrum - care and cultivation
Temperature: moderate, clerodendrum prefers about 22-24 ° C in summer, in winter it is always cooler, at a temperature of about 12-14 ° C. For long-term successful cultivation and abundant flowering, it is advisable to winter at a temperature not higher than 16 ° С and not lower than 10 ° С. If in winter, during the heating season, it is too hot and dry, the plants lose their leaves and are affected by ticks.
Lighting: bright, diffused light with some direct sunlight. Grows well on the west and east windows. In winter, the clerodendrum needs the brightest place, it is possible to place it on the south window. Oddly enough, clerodendrum can suffer much more from a lack of light than from room wintering. Poor lighting leads to exposure of the lower part of the stems, elongation of shoots, lack of flowering.
Watering: abundant during the growing season and flowering. The top layer of the soil must have time to dry out before the next watering; complete overdrying of the soil is not allowed. In winter, watering is limited, after the top layer of the earth has dried, you need to wait a few days before watering. But in general, the irrigation regime depends on the air temperature. It is better to underfill than overflow. You can navigate by the elasticity of the leaves - when the soil dries out too much, the clerodendrum begins to lower the leaves. But it is worth watering, and the drooping shoots regain their elasticity. If you dry it too much, the leaves turn yellow and crumble.
Fertilizer: from March to August, they are fed every two weeks with liquid fertilizer for indoor flowering plants, where the proportion of nitrogen is small, and there is a lot of potassium. For example, Fertika-Lux fertilizer is very suitable.
Air humidity: Clerodendrum loves high humidity, 60-70% is optimal for it, therefore, in hot dry weather in summer, it is sprayed twice a day. In winter, if the plant is not placed in cool conditions, spraying will only temporarily relieve the condition. It is better to place the pot of clerodendrum on a wide pan of water or wet pebbles, and insulate it from the central heating radiators. The lack of air humidity cannot be compensated for by more abundant watering.
Transfer: annually in the spring. The soil for clerodendrum is 1 part of leafy land, 1 part of sod land, 1 part of pine bark and 1 part of sand. Acidity pH is preferred to be slightly acidic or close to neutral. Do not tolerate clerodendrum of alkaline soil.
Reproduction: stem cuttings in spring and summer, rooted easily in water. Cuttings can be planted when the roots have grown 2-5 cm. Clerodendrum grows quite quickly, but in the first year, plants grown from cuttings may not bloom. Reproduction by seeds is possible. Seeds are sown in a mixture of universal soil and sand, watered by spraying. The main thing is to provide a lot of sun or very good supplementary lighting.
Flowering: Clerodendrum should be grafted in February or March, since inflorescences are formed at the ends of the shoots of the current year, and the branches should grow a little. Usually 3-5 new leaves are enough for flowering. Clerodendrum may not bloom without annual spring pruning.
Clerodendrum is sensitive to ethylene gas, and therefore do not put fruits (apples, pears) in the room; exhaust fumes and cigarette smoke are also harmful to it.