5213- Flagpole (Scallion) A very large straight tall scallion, often favored in Asian cooking. Flagpole scallions easily top 2 feet tall with long blanched bases that are as big around as a farmer's thumb. Space seed at 1/4 to 1/2 inch in rows 14-18"" apart. To establish perennial beds, thin direct seeded rows to leave best plants 6"" apart. These will enlarge as they grow into clumps. Among the hardiest garden plants, surviving well below zero F without any sort of protection.