Breeding method of late-maturing cold-resistant ribes nigrum

The invention provides a breeding method of late-maturing cold-resistant ribes nigrum, which comprises the following steps: selecting ribes nigrum 'Hanfeng' as a female parent and ribes nigrum 'Heifeng' as a male parent in May of the first year, and collecting flower buds of the male parent to prepare pollen; performing flower removal and bud thinning in the initial flowering stage of the female parent, performing emasculation on all the selected and reserved flower buds, performing pollination with the prepared pollen, performing bagging, and performing bag picking after 5-7 days; picking hybrid fruits when the fruits are ripe, washing the seeds, mixing the seeds with sand, and refrigerating and storing the obtained hybrid seeds; sowing the hybrid seeds in May in the second year, performing field management to obtain hybrid seedlings, lifting the seedlings, performing temporary planting, performing field planting in a seed selection nursery in the middle ten days of April in the third year, performing seed s