Question. How many seeds per foot should we plant to ensure growing from seed? When I lived north and on the praries it seemed they just spread to cover old abandond farm yards where they had been planted as hedges. We have about a 300 foot long empy fence line I would like to put these in. Our ground is sandy and rocky, and we get a lot of snow in winter, wet springs, and dry hotter summers. Just about like the praries, but not so cold in the winter. I will be able to get a good suply of seed soon and would like to know when I can just broad cast the seed and cover with loose dirt.