Hollow vegetable seed saving should choose thin land, high cool land as a seed saving field, because the soil is fertile, the stem and leaves grow vigorously, it will delay the flowering period, once the early frost comes, the stem and leaves die, the seed can not mature. The planting time of the seedling is a little later than the field, usually in late May to early June, with a row spacing of 1 meter, plant spacing of 0.6 meters, 2 plants per hole. Seedlings planted, do not need fertilizer and watering, but the shed should be early, preferably in the living tree after the "human" shed, the main stem will lead to the shed up, and later to successively lead the side branches on the shed.

Pay attention to the damage of red spider during the period of seed retention, timely prevention and control.

Under normal circumstances, flowering can be in late August, and the seeds begin to mature in late October. Mature seed shell black, dry and hard texture, can be harvested. Seeds mature a batch of harvesting a batch, in order to improve the quality of seeds. Generally in November, in the middle, before the frost harvest. Seeds should be dried immediately after harvest and then stored.