1. After the fruit matures in October, it is most suitable to collect seeds from November to December. After harvesting, the seeds are peeled off and stored in low-temperature drying, and then sown in drills or broadcast in April the following spring. Propagation by ramets: After the leaves fall in autumn or before germination in early spring, dig out the sprouts from the rhizosphere of the plants and plant them separately. Before planting, the roots can be properly pruned and the aboveground parts can be shortened. Hibiscus has strong adaptability, simple cultivation and extensive management, and can generally be allowed to grow freely. However, in order to improve its ornamental effect and make its flowers colorful, necessary management should be given. Hibiscus blooms on new branches of the current year and can be pruned appropriately after the leaves fall in autumn. When pruning, it is advisable to combine thinning and short cutting. Long branches should be cut moderately short, and dense branches and thin branches should be thinned out to concentrate nutrients and make them plump.
2. When planting hibiscus, base fertilizer should be applied to the planting hole, and fertilizer will generally not be applied in the future. From before the buds sprout in spring to the flowering period in summer, water 2 to 3 times depending on the weather. Drainage should be done to prevent waterlogging during the rainy season. Irrigate once before frost in autumn to prevent freezing. It is not advisable to irrigate in late summer and early autumn to prevent the autumn shoots from growing too tender and reducing cold resistance. When seedlings under 5 to 6 years old overwinter, cold protection measures should be taken, such as root soil cultivation.
3. It is also easier to obtain cutting materials, so cuttings are often used for propagation. Cutting and seedling cultivation should be carried out in early spring before the branches and leaves germinate. Choose a healthy plant free from diseases and insect pests as the mother plant. Before the mother tree germinates, select the middle and upper branches that are 1 to 2 years old and have a diameter of more than 1 cm as propagation materials (the selection of propagation materials can also be Combined with crown shaping and pruning in early spring), cut the branches into 15 to 20 cm long branches, soak in water for 4 to 6 hours and then make cuttings.
4. 75 grams of calcium, magnesium and phosphorus are used as base fertilizer. Cuttings require a trench depth of 15 cm, a trench spacing of 20 to 30 cm, a plant spacing of 8 to 10 cm, the upper end of the cuttings to be exposed to the soil surface of 3 to 5 cm or a depth of 2/3 of the cuttings. After the cuttings are made, the soil should be compacted and watered in time.
5. Since hibiscus cuttings are easy to take root, when the number of cultivations is small, direct cutting cultivation can be carried out. The cuttings can be directly planted into the planting holes according to the planting density without transplanting; long branches can also be used. For direct cultivation, the depth of the soil should be more than 20 centimeters to prevent lodging and drought damage due to shallow root systems.
6. Hibiscus has no strict soil requirements. Generally, it can be planted in the open space in front of and behind the house, on the hillside, and in the corner wasteland. It can also be used as a hedge to be planted in single rows around vegetable fields and orchards, or in patches. Planting for specialized production.
7. When transplanting and planting hibiscus, sufficient base fertilizer should be applied into the planting or planting ditch. Generally, it is mainly farmyard manure such as garbage soil or decomposed manure, and a small amount of compound fertilizer is applied. It is best to do it during the dormant period of the seedlings, but it can also be done during the rainy growing season. When transplanting, some branches and leaves should be cut off to facilitate survival. After planting, root water should be poured once and the soil should be kept moist until survival.