30 days — The roots of 'Purple Plum' radishes are round, a deep purple color, and have crisp white flesh that is sweet and mild and resists pithiness. Bred and introduced by the Alf Christianson Seed Company
of Mt. Vernon, Washington in 1985.
USDA, ARS, National Genetic Resources Program accession number PI 601220. PVP expired in 2003. Each packet contains three grams, which is approximately 200 seeds.