63-84 days. Robe Series nierembergia seeds grow elegant, frost-tolerant, and award-winning blooms when other flowers would wither. Robe Series nierembergia seeds promise compact 4-9 inch dwarf mounding shrubs with a 12 inch spread ideal for indoor gardening or hanging out on the porch or patio. Robe Series 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.