Ground silkworm farming moves from northern plains to mountainous prov… stockbot 0 2 06.18 11:45 https://vietnamnews.vn/society/1657614/ground-silkworm-farming-moves-f… + 1 https://vietnamnews.vn/rss/society.rss + 1 Lê Hồng Vân, director of the Central Mulberry Research Centre, said that raising silkworms on the ground requires a separate breeding house and a large floor area, which are very difficult to find in the crowded northern delta region.