Nemesias are cool season annuals that grow in the spring or fall. They may bloom all winter if they are not killed by frost. They can not withstand high humidity or heat. The plants grow 1 to 2 feet tall and 6 inches wide. They have blooms of white, yellow, orange, red or pink, which are good for cut flowers.
Buy nemesia seeds from a reputable supplier, either locally or online. See Resources for some online suppliers. Keep the seeds in a dry, cool place until you are ready to plant them.
Sow nemesia seeds 6 to 8 weeks before the predicted date of the last frost for spring planting or in late summer for fall planting.
Fill small peat pots to within ½ inch of the tops with seed starting medium. Use a spray bottle to lightly mist the soil.
Sprinkle four or five seeds on the soil in each pot. Use your fingertips to press the seeds firmly against the seed starting medium. Lightly cover the seeds with a thin layer of seed starting medium and mist again.
Place in a cool area with medium lighting. Nemesia seeds will germinate in 5 to 14 days.
When the seedlings are 5 to 6 inches tall keep the strongest seedling in each pot and remove the other seedlings. You may use a pair of scissors to snip the excess seedlings off at soil level.
Place the pots outside in a shaded location about a week before you are ready to transplant them.
Choose an area in full sun or partial shade with well drained soil. Use a trowel to dig a hole deep and wide enough for a peat pot containing a nemesia plant.
Set the pot in the hole and push the soil into the hole around the pot. Tamp the soil down firmly around the plant, covering all of the peat pot. Do not mound the soil up around the stem of the plant.
Water well with a watering can or water hose.