How is the market for growing Rosa laevigata?
The market for growing Rosa laevigata
Rosa laevigata belongs to the genus Rosa in the family Rosaceae. It is a climbing shrub, reaching 3-5 m in length, and its fruit is the Cherokee rose hip. Wild varieties are found in East China, Central South China, Southwest China, and Shaanxi and other provinces and regions. It prefers a warm, mild, humid climate and a sunny environment. Therefore it often grows in thickets on sunny hillsides. The fruit of Rosa laevigata has the functions of tonifying the kidney and securing essence and stopping diarrhea, and is mainly used to treat hypertension, neurasthenia, chronic cough and other conditions. The leaves of Rosa laevigata can detoxify and reduce swelling, and when used externally can treat stasis boils, burns and scalds, traumatic bleeding and other conditions. The root of Rosa laevigata has the functions of invigorating blood and dissipating stasis, dispelling wind and removing dampness. At present, because of the large amount of Rosa laevigata used and the depletion of wild resources, artificial cultivation of Rosa laevigata should have considerable prospects for development.
Propagation and seedling raising. Cuttage propagation can be used, and seed propagation can also be used.
Cuttage propagation. Fully enclosed moisture-retaining cuttage in winter gives a high seedling survival rate. The specific method is: in October to November, select hard branches of the current year that are fully developed, with a diameter between 0.5-0.8 cm, completely lignified, and free of pests and diseases. Cut off the top shoot portion and cut it into cuttings 20 cm long, each segment having more than 3 bud nodes, with the lower cut made as a slanting surface 0.2 cm below a node. Bind every 50 cuttings into 1 bundle, dip the slanting surface of the lower cut in a 0.05% rooting powder (atb) solution or a 0.05% to 0.1% naphthaleneacetic acid (naa) solution for 30 seconds, take them out and let them dry, then insert them. On a prepared sandy soil seedbed, mark lines and make points at a row spacing and plant spacing of 12 cm × 7 cm. When inserting, first use 1 small wooden stick to make a guiding hole at the point, then insert 1/2-2/3 of the length of the cutting into the hole, requiring 1 bud node to be exposed above the bed surface. After inserting, immediately press the soil firm and water once thoroughly. For winter cuttage, cover the bed surface with an arched plastic tunnel to increase temperature and retain moisture. In mid-to-late April, the plastic tunnel can be removed, and intertillage, weeding, and fertilizer and water management can be carried out. After 1-2 years of cultivation, when the seedlings are more than 80 cm tall, they can be lifted from the nursery and planted out.
Seed propagation. In September to October, harvest when the fruit skin is yellow-red, peel out the seeds, dry them and sow them promptly. On a prepared seedbed, open horizontal furrows at a row spacing of 20-25 cm, 1.5 cm deep. Then mix the seeds with plant ash and evenly scatter them into the furrows, covering with soil level with the bed surface. After sowing, cover the bed surface with grass to retain temperature and moisture. Use about 3 kg of seed per mu. After seedlings emerge in mid-to-late April, remove the covering grass and carry out intertillage, weeding, and topdressing. Generally, weed and loosen the soil 3-4 times each year, combined with topdressing 2 times. After the seedlings are cultivated for 2 years and the seedlings are 80 cm tall, they can be lifted from the nursery and planted out. Note to choose sandy loam soil with good drainage and irrigation conditions as the seedbed.
Do a good job of planting out. For growing Rosa laevigata, loam soil with good drainage, deep and fertile soil, and rich in humus is best. Places with heavy sticky soil, prone to waterlogging, and very damp, as well as saline-alkali soil, are not suitable for planting. Generally, planting out is done in early spring from February to March or in early winter from October to November. On prepared land, dig planting holes at a row spacing of 1-1.5 m and a plant spacing of 60-70 cm. Both the hole diameter and hole depth are 50 cm. Apply 5 kg of barnyard manure or farmyard manure to each hole, mix it evenly with the subsoil, and cover with 10 cm of fine soil. Plant 1 strong seedling in each hole.
Field management. Within 1-3 years after planting out, carry out intertillage and fertilization once each in spring, summer, autumn, and winter every year. From the 4th year until the rows close, carry out intertillage, weeding, and fertilization once each in spring and autumn every year. After planting out, prune dead branches, weak branches, dense branches, aged branches, water sprouts, and pest- and disease-damaged branches every winter. For strong growing long branches, carry out pruning by cutting back. In rainy seasons, pay attention to drainage.
Propagation and seedling raising. Cuttage propagation can be used, and seed propagation can also be used.
Cuttage propagation. Fully enclosed moisture-retaining cuttage in winter gives a high seedling survival rate. The specific method is: in October to November, select hard branches of the current year that are fully developed, with a diameter between 0.5-0.8 cm, completely lignified, and free of pests and diseases. Cut off the top shoot portion and cut it into cuttings 20 cm long, each segment having more than 3 bud nodes, with the lower cut made as a slanting surface 0.2 cm below a node. Bind every 50 cuttings into 1 bundle, dip the slanting surface of the lower cut in a 0.05% rooting powder (atb) solution or a 0.05% to 0.1% naphthaleneacetic acid (naa) solution for 30 seconds, take them out and let them dry, then insert them. On a prepared sandy soil seedbed, mark lines and make points at a row spacing and plant spacing of 12 cm × 7 cm. When inserting, first use 1 small wooden stick to make a guiding hole at the point, then insert 1/2-2/3 of the length of the cutting into the hole, requiring 1 bud node to be exposed above the bed surface. After inserting, immediately press the soil firm and water once thoroughly. For winter cuttage, cover the bed surface with an arched plastic tunnel to increase temperature and retain moisture. In mid-to-late April, the plastic tunnel can be removed, and intertillage, weeding, and fertilizer and water management can be carried out. After 1-2 years of cultivation, when the seedlings are more than 80 cm tall, they can be lifted from the nursery and planted out.
Seed propagation. In September to October, harvest when the fruit skin is yellow-red, peel out the seeds, dry them and sow them promptly. On a prepared seedbed, open horizontal furrows at a row spacing of 20-25 cm, 1.5 cm deep. Then mix the seeds with plant ash and evenly scatter them into the furrows, covering with soil level with the bed surface. After sowing, cover the bed surface with grass to retain temperature and moisture. Use about 3 kg of seed per mu. After seedlings emerge in mid-to-late April, remove the covering grass and carry out intertillage, weeding, and topdressing. Generally, weed and loosen the soil 3-4 times each year, combined with topdressing 2 times. After the seedlings are cultivated for 2 years and the seedlings are 80 cm tall, they can be lifted from the nursery and planted out. Note to choose sandy loam soil with good drainage and irrigation conditions as the seedbed.
Do a good job of planting out. For growing Rosa laevigata, loam soil with good drainage, deep and fertile soil, and rich in humus is best. Places with heavy sticky soil, prone to waterlogging, and very damp, as well as saline-alkali soil, are not suitable for planting. Generally, planting out is done in early spring from February to March or in early winter from October to November. On prepared land, dig planting holes at a row spacing of 1-1.5 m and a plant spacing of 60-70 cm. Both the hole diameter and hole depth are 50 cm. Apply 5 kg of barnyard manure or farmyard manure to each hole, mix it evenly with the subsoil, and cover with 10 cm of fine soil. Plant 1 strong seedling in each hole.
Field management. Within 1-3 years after planting out, carry out intertillage and fertilization once each in spring, summer, autumn, and winter every year. From the 4th year until the rows close, carry out intertillage, weeding, and fertilization once each in spring and autumn every year. After planting out, prune dead branches, weak branches, dense branches, aged branches, water sprouts, and pest- and disease-damaged branches every winter. For strong growing long branches, carry out pruning by cutting back. In rainy seasons, pay attention to drainage.