Planting techniques of Rosemary

Rosemary is a valuable natural spice plant, which emits a delicate fragrance during the growing season, which has a refreshing effect, pleasant aroma from stems, leaves and flowers, and aromatic oils extracted from flowers and twigs. It can be used to mix cosmetic materials such as air cleaners, perfumes and soaps, which is of great cultivation value. Let's take a look at the planting techniques of rosemary.

Growth habits of Rosemary

Rosemary is native to Europe and the Mediterranean coast of North Africa, and is mainly cultivated as a cash crop in southern Europe. It was introduced in China during the Cao-Wei period, and now it is mainly planted in most parts of the south and Shandong. The nature likes the warm climate, but the growth is slow in the high temperature period in Taiwan, and the temperature without cold current in winter is more suitable for its growth. in the aspect of water supply, the leaves of rosemary are leathery and can tolerate drought. therefore, the cultivated soil is rich in sand to enable good drainage is more conducive to growth and development, it is worth noting that the slow growth of rosemary, so the regeneration ability is not strong.

Propagation techniques of Rosemary

1. Sowing: seedlings are generally raised in the greenhouse in early spring, either by soil method or by burrow tray, but the germination rate is very low, generally only 10% to 20%, and the growth of rosemary is very slow in the first year, even if the plant size in autumn is not much larger than that when it was first planted, the formation of a large amount of yield will be very slow after 2-3 years. Therefore, asexual reproduction is generally used in production. But from the seed cultivation, the smell is more fragrant, so the use of breeding methods, depending on the needs.

2, cutting: Rosemary cutting propagation is mostly carried out from winter to early spring, select fresh and healthy stems that are not completely lignified as cuttings, cut off about 10-15 cm from the top, remove about 1 blade 3 leaves below the branches, and directly cut into the medium, the medium remains moist, about 3 to 4 weeks will take root, 7 weeks later can be planted to the open field, the lowest night temperature of cutting is 13 degrees Celsius.

3. Striping: rosemary striping propagation mainly makes use of the characteristics that rosemary stems can produce adventitious roots, bending the branches close to the ground to cover the soil, leaving the top in the air, waiting for new roots to grow, cut from the mother to form new individuals, and planted in the open field.

Planting techniques of Rosemary

1. Soil preparation: before transplanting, rosemary can be transplant by dipping the flat land into the pond according to the row spacing, applying a small amount of base fertilizer, and then covering the base fertilizer with thin soil. Usually, the transplanting seedlings in the field are the mother seedlings that take root and survive by transplanting branches. The row spacing of the transplanted plants is 40 × 40 cm, and the number of plants per mu is 4000 × 4300. The planting season is available all the year round in the middle and south of Yunnan Province, and it is the best in spring and autumn.

2. Planting: rosemary is best planted on cloudy, rainy days and when the sun is not strong in the morning and evening. After transplanting, it is necessary to pour enough fixed root water, and do not dump the seedlings when watering. If there is lodging, it should be righted and stabilized in time. Rosemary was watered for the second time 5 days after planting (depending on the dry and wet soil). After the seedlings survive, watering can be reduced. It is found that dead seedlings should be replanted in time, and the distance between the ponds should be taken as a straight line to facilitate ventilation.

3. Fertilization: Rosemary is relatively resistant to thin ridges, and a small amount of compound fertilizer is applied after ploughing and weeding in the seedling stage according to different soil conditions. fertilizer should be covered with soil after fertilization, and quick-acting fertilizer is applied once after each harvest, mainly nitrogen and phosphate fertilizer. generally, 15 kg of urea per mu and 25 kg of common superphosphate.

4. Pruning: Rosemary can be pruned 3 months after planting. Excessive strong pruning often causes the plant to no longer sprout, and it is safer not to exceed half of the branch length at each pruning. Although rosemary plants have small buds in each leaf axil, these axillary buds will also develop into branches with the extension of branches in the future. when they grow up, the whole plant will not only appear messy because of the horizontal branches, but also vulnerable to diseases and insect pests due to poor ventilation. Therefore, regular pruning is very important.

5. Harvest: Rosemary can be harvested for many years after one planting, mainly branches and leaves, which can be folded by scissors or directly by hand. However, special attention must be paid to the fact that the juice from the wound will soon become viscose, which is difficult to remove, so gloves and long-sleeved clothing must be worn during harvest. The harvest times can depend on the growth situation, generally, it can be harvested 3 times per year, and each harvest is at least 250 kg per mu.

6. Diseases and insect pests: Rosemary in a humid environment, root rot, gray mold and other common diseases. If the plant wilts when the substrate is still wet, the plant needs to be removed from the greenhouse immediately. The most common pests are red leaf mites and white whitefly, and the most ideal method is to use biological control. We should focus on prevention, we can start from the sanitary condition, appropriate water management, reasonable temperature and light, and need frequent observation to eliminate sick and weak plants in time.