The difference between Rhododendron and Rhododendron in spring: the propagation and garden utilization of Rhododendron
Curly: It is an evergreen or semi-evergreen shrub, with sparse branches, dense light brown flat hairs on young branches, paper-like leaves, type II, elliptic to elliptic lanceolate or oblate oblate oblanceolate, 2.5-5.6 cm long, 8-18 mm wide, sharp tip, convex tip, wedge-shaped base, and yellow at first. Capsule oblong-ovoid, about 8 mm long, with rough persistent calyx. Traditional varieties include Jade Butterfly, Purple Butterfly, Ryukyu Red, Yuling and so on.
Spring rolls: also known as Yingshanhong, Manshanhong, Mountain Wandering, Red Wandering, Shan Shiliu, deciduous shrubs, about 2 meters high; There are many branches, thin and straight. Leaves alternate, oblong, with sharp apex, dark green surface, sparse bristles and light green back. Racemes, solitary or terminal flowers, funnel-shaped, colorful and varied. There are evergreen azaleas and deciduous azaleas; According to the flowering period, it is divided into spring azalea, summer azalea and spring and summer azalea. According to the pattern, it is divided into single flap, sleeve flap and double flap. Petals can be divided into flat, slightly wrinkled and wrinkled. The flowering period is from April to May, and the fruit maturity is 65438+ 10. Mostly shrubs on slopes and hills.
Second, the ecological habits of Mao Juan
Curly likes cool, humid and sunny environment. Cold-resistant, afraid of heat, resistant to semi-shade, not resistant to long-term strong light irradiation. The optimum growth temperature is 15 ~ 28℃, and it can tolerate the low temperature of -8℃ in winter. Acidic sandy loam with fertile and loose soil and good drainage.
Third, Mao Juan's breeding skills.
1. Cutting: in rainy season. Select semi-mature shoots with the length of 12 ~ 15 cm, remove 2 ~ 3 leaves at the base, leave the top leaves, and cut off half. The cuttings were treated with 0.8% indolebutyric acid solution for 2 ~ 3 seconds, then inserted into sand bed, kept at room temperature 15 ~ 18℃, and took root 50 ~ 60 days after insertion.
2. Stratification: It will be carried out from April to May, and the high-altitude stratification method will be adopted. Select mature branches of 2-3 years old, peel them annularly at a distance of 20-30 cm from the top of the branches, with a width of 2 cm, and wrap them with humus and film. Heal and take root in 4 ~ 5 months, and cut off the potted plants in autumn.
3. Sowing: April is suitable, and indoor potted plants are used for sowing. The optimum temperature for germination is 22 ~ 24℃, and the seedlings germinate 10 ~ 15 days after sowing, so the seedlings grow slowly.
Fourth, pest control in Mao Juan.
Brown mold and black spot often occur in hairrolls, and 70% mancozeb wettable powder is sprayed with 600 times solution. Insect pests do great harm to red spider and military mixed insects, spraying 80% dichlorvos EC 1000 times.
Five, the garden use of Mao Juan.
Mao Juan is planted in patches with colorful flowers, which can increase the natural landscape effect of gardens. It can also be planted on rocks, Chi Pan and the edge of lawns to increase the atmosphere of the garden. Potted plants are placed in hotels, bedrooms and public places, which are gorgeous and dazzling.
Six, spring rolls are generally propagated by sowing, cutting and grafting, and layering and dividing plants are also feasible.
1, sowing, the evergreen rhododendron is best sown with the harvest, and the deciduous rhododendron can also store its seeds until the next spring sowing. When the temperature 15 ~ 20℃, the seedlings will emerge in about 20 days. Cutting: Generally, semi-lignified branches of the current year are selected as cutting in May-June, and then shaded in shed. They can take root in 1 month at about 25 degrees Celsius.
2. Propagation can be divided into plants, layering, cutting and sowing. Plant division, which is carried out after the flowering of clustered large plants; Stratification is carried out in March-April. Cut off the stems of the branches about 3-4 cm, and bury them with soil, leaving the top of the branches outside the soil. 1 year later, cut it from the stem of the layering and plant it separately. Cutting: selecting annual shoots as cuttings, cutting new shoots with a length of 5-6 cm from April to June, leaving 2-3 leaves at the top and inserting them into loose acidic soil; Sow, in spring.
3. Prepare a pot of soil. 1-2-year-old seedlings can be prepared according to humus 80%, fly ash 15% and other decomposed base fertilizers 5%. For big seedlings over 3 years old, 60% humus, 20% fly ash and 20% other decomposed fertilizers should be prepared. It can be transplanted in spring and autumn.
Seven, the prevention and treatment of spring roll disease. Spraying 600-800 times of Tobezin solution or the same amount of Bordeaux solution on flowerpots, soil and plants for 2-3 times before new buds germinate in winter and spring; Spraying 600-fold solution of 50% wettable carbendazim once a week 1 time for 3 times; Red spider is prone to occur in midsummer, and 50% dichlorvos emulsion can be sprayed for 2000 times.
Eight, the role of spring rolls in the garden. Spring rolls can be potted or planted in the shade. Its shape is very beautiful. Rhododendron trees cultivated in the courtyard should be cut into umbrellas to add interest and beauty. Suitable for group planting in damp and shady forests and rocks, and also suitable for planting in trees, forests, streams, Chi Pan and lawn edges in gardens; Hedges and flowers can be planted together on the shady side of buildings. Some kinds can be used as bonsai. Gardens are most suitable for planting in clusters near forest edges, streams, Chi Pan and rocks, or scattered under sparse forests. Spring rhododendron is also a good material for flower hedges, and it can also be trimmed and cultivated into various forms.