Codonopsis pilosula seed retention: Select the Codonopsis pilosula plot with good quality, good growth and no pests and diseases as the seed retention field. Because the flowering period is long and the maturity of seeds is very inconsistent, it is necessary to collect them in stages and batches. From September to 10, when the fruit is brown and soft and the seeds are dark brown, harvest, air dry, rub off the seeds, remove the shell impurities, put them in cloth bags and store them in a dry and cool place.