Most of the drooping begonia are grafted, and the rootstocks are mainly Gao Qian-based straight begonia such as Hoba begonia, and excellent drooping begonia varieties are used as scions.

1. Grafting time. From March to April, when the sap begins to flow, the grafting of Malus pendula is carried out by skin grafting, and it should be noted that the grafting should be carried out to avoid rainy days.

2. Collection and treatment of scions. Select the pure and robust Malus davidiana "Hongyu, Louisa, Royal Beauty" plants, cut off the well-developed one-year-old branches, cut them into 12 ～15 cm branches with two pairs of full buds, wrap the top with plastic film to prevent evaporation, cut the lower side into a single slope of 2-3 cm, cut the back end into a small slope of . 5-.8 cm, and remove the leaves, leaving the petiole.

3. Selection of rootstock. The rootstock was selected from the straight stem begonia with a DBH of 6. -8. cm.

4. Grafting method.

select the rootstock with basically the same DBH and crown width, cut it off at the height of 2. 5m, and cut a 3-4cm-long incision downward at the edge of its section with a grafting knife. Grafting the trimmed scion into the cortex at the incision of the rootstock for fixation, and tying it tightly with plastic film from bottom to top to prevent water loss after grafting. Generally, 3 ~ 4 scions are grafted on each trunk.

Extended information:

Maintenance and management techniques after grafting of begonia:

1. Check the survival rate and repair.

2-3 days after grafting, the grafting survival should be checked, and those without grafting survival should be replenished in time.

2. Wipe the sprout.

after grafting, pay attention to the germination of rootstocks and scions. When the new shoots of scions grow to 1-12cm, all the rootstocks except scions should be erased to promote nutrient flow to scions. After that, wipe a bud every 5 days until no new buds appear on the rootstock.

3. Reinforce the new shoots of the scion.

With the increasing growth of scion shoots, the leaves gradually increase and become larger, so in the later stage, in addition to erasing the sprouts, the scion shoots should be fixed. Fixtures can be used to reinforce the scion to avoid the loosening of the interface caused by wind shaking. When the new shoots grow to 5 cm, take off some leaves in time to avoid the increase of the weight of the new shoots caused by too many leaves, which will cause the scion to break or fall off when the wind blows.

4. Fertilizer and water management.

after 7 days of grafting, when the rootstock and scion are basically healed, the first watering is started, and the survival of grafted seedlings is checked about 2 days later, and the first watering is carried out with fertilization. Topdressing of 15 ~ 225 kg hm-2 of N, P and K compound fertilizer is started at 5 minutes, and topdressing can be carried out for 2 ~ 3 times throughout the year, combined with fertilization and timely watering. After watering or raining, loosen the soil, weed and conserve moisture in time, and stop fertilizing after defoliation.

5, shaping and pruning.

reasonable pruning should be carried out in the year of grafting survival. Generally, it should be trimmed into an umbrella shape, and the pruning method should draw lessons from the pruning method of Ulmus davidii. Pruning shall be carried out according to the principle of "good density, good quality and even dispersion". Generally, it will take 3-4 years to cultivate a tall weeping begonia.

Reference: Baidu Encyclopedia-Begonia