63-84 days to maturity. Nierembergia scoparia. Nierembergia Robe Series Seeds. Non-GMO, Annual. Ornamental. Robe Series nierembergia seeds grow elegant, frost-tolerant, and award-winning blooms when other flowers would wither. Robe Series nierembergia seeds promise compact, dwarf, mounding shrubs ideal for indoor gardening or hanging out on the porch or patio. Nierembergia is hardy, easy to grow from seed, and thrives in a variety of cool summer gardens. Robe Series nierembergia debuted as an All-American Selections (AAS) Flower Winner for its ease at growing from seed. About 170,000 seeds per ounce.