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Hoya is an evergreen climber suitable for the conservatory, bearing slightly pendant heads of waxy flowers which can be highly scented, particularly in the evening.
Hoya in flower
Hoyas are native to Indo-China, Indonesia and Australasia, and in this country they need to be grown in a warm bright room in the house or heated conservatory. The most commonly grown are Hoya carnosa and Hoya lanceolata ssp. bella (syn. H. bella).
Do not move plants once flower buds form and do not remove the flower stalk (peduncle) after flowering as more flowers are often borne on the stumps of previous clusters.
Plants require a humid atmosphere – maintain good levels of humidity by standing the container on tray of gravel, expanded clay granules (Hydroleca) or recycled lightweight aggregate (Hortag) and keep moist, with the water level slightly below the surface of the gravel.
Re-pot in spring if needed, and do not feed for 5-6 weeks after re-potting.
Sharply draining, well aerated compost is essential for hoya to thrive. This can be made using one part by volume orchid bark, one part peat free compost and one part coarse perlite. Alternatively, use cactus compost but add some extra perlite.
Hoya carnosa is a strong-growing climber and should be grown up a trellis or around a wire hoop. In a conservatory it can be trained along horizontal wires. H. bella is a small bushy plant best grown in a hanging basket.
Cut back or thin congested growth at the end of February.
Hoyas do not respond well to hard pruning and over-large plants are best replaced.
Hoyas can be increased in a couple of ways;
H. carnosa ‘Variegata’: This hoya has creamy white margins to its succulent leaves with waxy night scented white flowers.
Hoya lanceolata ssp. bella (syn. H. bella): A succulent trailing plant with clusters of sweetly scented white flowers with purple centres.
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Common problems encountered when growing hoyas include;
Leaf-drop, blackening of leaves and dieback of stems: may be due to poorly-drained or water-logged compost or being too cool during the winter.
Wilting and die back of the growth above ground: can be caused by overwatering or excessive application of fertiliser making the roots unable to absorb water owing to the excessive levels of salts in the soil.
Root rot: may occur as a result of overly wet or poorly drained compost. Plants can be rescued by taking cuttings as soon as the problem is noticed.
Failure to flower: possibly due to insufficient light.
Houseplant pests: susceptible to mealybug, glasshouse whitefly and scale insect.
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