Although M. mirabilis can flower, it is rarely fruitful, and the stem nodes are prone to adventitious roots. Cuttings are very easy to survive and are suitable for cutting propagation. This is also the reproduction method often used in production.
First, cutting time
In frost-free places, cuttings can be carried out at the anniversary, but in the spring and autumn, cuttings take root quickly and grow rapidly. Therefore, it is generally conducted in February to March and September to October.
Second, select the cuttings
During cutting propagation, firstly grow strong and robust shoots from disease-free and robust plants of M. mirabilis and not over tender or over-age shoots. The cuttings are about 10 cm long, with 3 to 5 leaves, and 1 to 2 leaves at the base must be removed.
Third, cutting techniques
According to the spacing of 20~30 cm, plant spacing of 7~10 cm, obliquely inserted in the seedbed, the depth of the shoots to 5 ~ 6 cm is appropriate, after the plug water spray, supporting the small arch stent cover film, keep bed soil moist. The spring cutting propagation should be provided with a small arch shed to keep it warm and moist; in the early autumn, when it is hot and dry, and in heavy rain seasons, it can cover the shade omentum, moisturize and cool, and prevent heavy rain from scouring.
IV. Seedling management
The key to the management of seedlings of Viola mirabilis is to grasp the appropriate temperature and humidity. The temperature is generally 20 ~ 25 °C is appropriate. During the seedling stage, we should also pay attention to keep the bed soil moist. Drying and over-wetting are not conducive to rooting and new leaf growth. Humidity is too high and perishable; too little influence roots. In this way, after 15 to 20 days of cuttings, new leaves can be grown and become roots.
V. Prevention of pests and diseases
1 Use disease-free plots and disease-free plants for cultivation to reduce the chance of disease infestation. 2 50% carbendazim WP can be used for spray control of anthrax; if whitefly occurs, it can be sprayed with 10% fluocinol EC 1000 times or 1.8% avermectin 3,000 times.
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