How to Propagate Rosemary? A Complete Guide to Growing Techniques

Rosemary is a valuable natural aromatic plant. During the growing season it gives off a fresh fragrance and has the effect of refreshing the mind and lifting the spirits. Its stems, leaves and flowers have a pleasant scent, and the aromatic oil extracted from the flowers and young branches can be used to blend air fresheners, perfumes, soaps and other cosmetic ingredients, giving it extremely high cultivation value. Let us take a look below at the growing techniques for rosemary!

Rosemary's Growing Habits

Rosemary originates from Europe and the Mediterranean coast of North Africa. In southern Europe it is mainly grown as an economic crop. It was introduced to China during the Cao Wei period, and is now mainly planted in most parts of the south and in the Shandong region. It prefers a warm climate, but grows slowly during the high-temperature period on the plains of Taiwan, China; temperatures without cold waves in winter are more suitable for its growth. As for water supply, since rosemary's leaves are leathery, it is fairly drought-tolerant, so soil rich in sand that drains well is more conducive to its growth and development. It is worth noting that rosemary grows slowly, so its regenerative capacity is not strong.

Rosemary Propagation Techniques

1. Sowing: Seedlings are generally raised in a greenhouse in early spring. Either traditional soil-based seedling raising or plug-tray seedling raising can be used, but the germination rate is very low, generally only 10-20%, and in the first year rosemary grows extremely slowly. Even by autumn the plants are not much larger than when they were just transplanted, and it takes 2-3 years to form a large yield, which is very slow. Therefore, vegetative propagation methods are generally used in production. However, plants grown from seed have a more fragrant scent, so which propagation method to use depends on the need.

2. Cuttings: Rosemary cutting propagation is mostly carried out from winter to early spring. Select fresh, healthy stems that have not yet fully lignified as cuttings, cut them about 10-15 cm from the top, remove about 1/3 of the leaves from the lower part of the branch, and insert them directly into the medium. Keep the medium moist; roots will form in about 3-4 weeks, and after 7 weeks they can be transplanted to open ground. The minimum night temperature for cuttings is 13°C.

3. Layering: Rosemary layering propagation mainly makes use of rosemary's ability to produce adventitious roots on its stems. Bend a branch close to the ground down and cover it with soil, leaving the top exposed to the air. Once new roots have grown, cut it from the parent plant to form a new individual, then transplant it to open ground.

Rosemary Growing Techniques

1. Land preparation: Before transplanting rosemary, first dig holes in the leveled land according to the row spacing, apply a small amount of base fertilizer, then cover the base fertilizer with a thin layer of soil, and it is ready for transplanting. Usually the seedlings transplanted in the field are mother seedlings that have survived from cuttings that have rooted. The transplanting row spacing is 40×40 cm, and the number planted per mu is 4000-4300 plants. In central and southern Yunnan Province, planting can be done all year round, with spring and autumn being best.

2. Planting: For planting rosemary, it is best to choose cloudy days, rainy days, or early morning and late afternoon when the sunlight is not strong. After transplanting, water thoroughly to settle the roots. When watering, do not let the seedlings topple over; if any fall over, straighten and firm them promptly. Water rosemary a second time 5 days after planting (depending on how dry or wet the soil is). Once the seedlings have established, watering can be reduced. Replace dead seedlings promptly. When planting, line up the centers of the holes in a straight line to help with ventilation.

3. Fertilizing: Rosemary is fairly tolerant of poor soil. During the seedling stage, depending on the soil conditions, apply a small amount of compound fertilizer after cultivating and weeding. After fertilizing, cover the fertilizer with soil. After each harvest, apply a quick-acting fertilizer, mainly nitrogen and phosphorus, generally 15 kg of urea and 25 kg of ordinary superphosphate per mu.

4. Pruning: Rosemary can be pruned 3 months after it has established. Excessive heavy pruning often causes the plant to be unable to sprout again. The safer approach is not to cut more than half the length of the branch each time you prune. Although small buds appear at every leaf axil of the rosemary plant, and as the branches extend these axillary buds will also develop into branches, once they grow the whole plant becomes messy because of the branches growing sideways, and poor ventilation also makes it prone to pests and diseases. Therefore, regular pruning and shaping is very important.

5. Harvesting: Rosemary can be harvested for many years after a single planting. Harvesting mainly targets the branches and leaves, which can be cut with scissors or picked directly by hand. However, special attention must be paid to the fact that the sap flowing from the wound quickly turns into a sticky gum that is very hard to remove, so gloves and long-sleeved clothing must be worn when harvesting. The number of harvests depends on the growth situation; generally 3-4 harvests can be made each year, with at least 250-350 kg per mu per harvest.

6. Pests and diseases: In humid environments, root rot, gray mold and similar problems are common diseases of rosemary. If the plant wilts while the growing medium is still moist, the plant needs to be moved out of the greenhouse immediately. The most common pests are red spider mites and whiteflies, and the ideal method is biological control. The emphasis should be on prevention, starting with sanitation, proper water management, reasonable temperature and light, and frequent observation to promptly remove diseased and weak plants.

How to Grow Rosemary, Rosemary Cultivation and Propagation Methods

Rosemary likes a warm, humid environment. It grows slowly at higher temperatures, and grows faster in winter when the weather is clear and there are no cold waves. Rosemary has many leaves, which are leathery, so it is fairly drought-tolerant; keeping the soil slightly moist can meet its water needs. However, the soil used for planting should be one with good drainage, which is more conducive to its growth.

Rosemary is a type of herb. It likes a cool, dry environment, and the flower pot is very important for its growth. Unglazed clay pots have the best breathability and can be given priority consideration. As for pot size, one about 20 cm in diameter will do. If it is too large, the amount of water is hard to control, and since rosemary grows slowly, it does not need too much growing space.

As for soil, ordinary garden soil is enough. Before planting, add a small amount of fertilizer to the soil.

Fertilizing about two or three times a year is enough. Use decomposed organic fertilizer and place it in the soil at the edge of the flower pot. Applying light fertilizer frequently also works; a single application does not need much fertilizer. Adjust fertilization appropriately according to the plant's growth.

As for watering, in summer it needs more water. Generally, when summer temperatures are high, do not water at noon; water once in the morning and once in the evening. In other seasons, generally water once a week. During care, water according to the condition of the potting soil; if it is dry and turning pale, it needs watering.

Rosemary is a fairly cold-tolerant plant. In winter it can be placed on a semi-enclosed balcony to overwinter, and around -5°C is no problem. So there is no need to take warming measures in winter; it will not freeze to death. But if the winter temperature in your area is below -10°C, it is still best to move it indoors! Summer temperatures are higher, so ventilate and cool it promptly to promote its growth.

Actually, gardeners water based on experience. Those growing rosemary for the first time need to note that in the high summer temperatures, although more watering is needed, you must not water heavily, as the plant easily wilts and its growth slows. In addition, the same situation can occur with perennial plants if watering is improper.

After rosemary blooms, it needs a sufficient amount of fertilizer to promote longer blooming, but it is best not to use chemical fertilizer, to avoid fertilizer burn. For ordinary home growing, you can also water it with a little fermented rice-washing water.

In humid environments, root rot, gray mold and similar problems are common diseases of rosemary. If the rosemary plant wilts while the growing medium is still moist, the plant needs to be moved out of the greenhouse immediately. The most common pests are red spider mites and whiteflies. At present, the ideal method is biological control.

Propagation methods suitable for rosemary include sowing, cuttings and layering. Rosemary seeds germinate slowly and have a low germination rate, so they are usually used only when introducing new varieties. During the rooting period, the suitable temperature in the greenhouse is 22°C, and the cuttings need to be misted frequently, but excessive moisture will cause the tops of the cuttings to rot and the roots produced will not be sturdy enough. In the first 10 to 14 days, as the cuttings begin to root, special attention must be paid to preventing the cuttings from wilting.

How to Grow Rosemary, Rosemary Cultivation Methods and Precautions

Rosemary originates from Europe and the Mediterranean coast of Africa. It was introduced to China as early as the Cao Wei period. The flowers and leaves of rosemary can be used to extract essential oil and antioxidants. It likes a warm climate, is not cold-tolerant, and its regenerative capacity is not strong. This article shares with you the cultivation methods and precautions for rosemary.

How to Grow Rosemary

Rosemary can be propagated by seed, cuttings and layering. Management can be extensive, and it is mostly planted in well-drained plots.

Rosemary is best transplanted in weather with weak sunlight. Water according to how dry the soil is, and once the seedlings have grown steadily, reduce watering. When planting in the field, pay attention to row spacing; when growing in pots, also place them in an open place to help with ventilation, which can reduce the occurrence of various diseases.

Rosemary can survive even in poor soil conditions. A small amount of compound fertilizer can be applied according to the soil situation, and after fertilizing the fertilizer should be covered. For field planting, apply a quick-acting nitrogen and phosphorus fertilizer after each harvest.

Three months after transplanting rosemary, it can be pruned. Reasonable pruning can stimulate flower bud differentiation, make the plant's branches grow in an orderly way, and improve ventilation conditions.

Precautions for Growing Rosemary

Rosemary is not a delicate plant and can be managed extensively, but a humid environment most easily triggers diseases such as root rot and gray mold in rosemary. Diseased plants must be isolated immediately to prevent large-scale spread. For common pests, the emphasis should be on prevention, starting with sanitation, water management, light and temperature, and so on, observing promptly, taking necessary measures, and promptly removing diseased and weak plants.

Rosemary has very high industrial value, medicinal value and edible value, and is a symbol of remembrance and commemoration. The above are the cultivation methods and precautions for rosemary. I hope they can help you.

Further Reading:

Rosemary Cultivation Methods, Fertilizing Techniques, Flower Language and Meaning, Effects and Functions