|This woody-based perennial is also sold as N. foetens and produces lavender, blue, or white flowers with yellow throats from early summer to fall. Growing to a height of 24 inches tall and 12 inches wide, Nemesia prefers moist, yet well-drained soil that is slightly acid. Full sun is best for ample flowering. Also, be sure to water well if weather is dry during the flowering period. Foot and root rot may pose a problem.