| Life form | Tree, Shrub |
| Family | Apocynaceae |
| Origin | India |
| Ease of cultivation | Average. |
| The size | A very tall plant. Can reach a size of up to 1.2-2 m and above, if not cut. |
| Growth rate | Fast, up to 25-30 cm and more per year, if not pruned. |
| Lifespan | A perennial |
| Temperature | In the summer: 75,2-84,2 ° F, in the winter not below + 53,6-60,8 ° F. The plant is thermophilic. |
| Humidity | It is desirable to have a high humidity of at least 60% It is necessary to regularly spray with soft, dewatered water, not allowing it to fall on the flowers. |
| Lighting | Bright light, can grow on the southern window with shading at noon hours, the east and west windows also fit, but in the case of insufficient illumination holarena may not bloom. In a day, you need at least 6 hours of direct sun. Especially important is lighting in autumn and winter. |
| The soil | Fertile, well drained soil is suitable. 2 parts of leafy land, 1 part of sod land, 1 part of peat land, 1/2 part of coarse sand or perlite. 2-nd version: 2 parts of the turf ground, 1 part peat lands, 1 part humus earth, 1 part coarse sand. Always use a pot with an opening and drainage. |
| Watering | Abundant in summer, but the top layer of the soil should dry up between waterings. In autumn and winter, the soil is kept in a semi-dry state, but do not allow complete drying. Water should never be retained in a pot. |
| Fertilizer | With the beginning of growth in spring, a complex fertilizer is introduced, then from May to September they are fed twice a week with liquid fertilizer for flowering plants enriched with microelements. It is useful to use organic fertilizer. |
| Reproduction | The apical cuttings, but the rooting is very complicated. The cut should be made oblique or cut the stem by half. Before rooting, cuttings are dipped in water, processed with corn root powder and fungicide. Root in perlite or a mixture of perlite with soil. For the stability of the cuttings, it is possible to fill the bottom layer of soil, then a layer of perlite, place the cuttings so that the cut is completely in the perlite, then top the soil again. Root the stem at a temperature of 69,8-82,4 ° F. Rooting can last up to 30 days.You can propagate holarenu seeds, which are sown in 6-cm pots. Seeds should first be soaked by wrapping in a damp cloth for 24 hours. Seeds germinate for about two weeks. The seedlings grow very slowly. Seeds lose their germination after about a year. |
| Bloom | Bloom almost all year round, but mainly in summer and autumn: white tubular 5-petalled flowers 2.5-3.5 cm in diameter with a flavor that reminiscent of jasmine. |
| Transfer | Young plants are transplanted annually, adults – every 2-3 years in spring, in March; the pot must be bulky. Transplant the holarenum 2-3 days after watering. To avoid excessive sprawl, you can crop root systems for the transplant of 5-7 cm. The adult plant can replace the top layer of soil. |
| Features of care | It is widely used in medicine. In summer, the plant is better placed in the garden or on the balcony in a place protected from rain and wind. The plant loves airing.It is necessary to form the crown of the plant: a constant pruning of stretched shoots in the spring after the end of the rest period for normal flowering. It is necessary to cut too long, weak and deformed branches. |
| Difficulties | It is affected very often – spider mites, scutellum, and also mealybug. The leaves turn yellow and from insufficient, and from excessive watering. |
| Air cleaning | – |
| Toxicity | Toxic, one should be careful with the juice of the plant. |
