Answer: Nemesia 'Aromatica Royal' grows 12-14 inches high, and 10-12 inches wide. It grows in full sun to part shade and blooms from spring until frost. It prefers moist, organic, well drained soil and appreciates a light feeding every two weeks. (I use a half-strength dilution of liquid fertilizer such as Miracle-Gro or Peter's). If you remove the spent flowers, the plant will look neat and tidy and will flower even more prolifically.
If your plant looks puny, it could be simply a sign of transplant stress. Watering it when the top of the soil begins to dry should help the roots become firmly established, which should help its overall appearance and productivity.
Hope this answers your question!
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