Primulas are popular perennial flowers in many European countries and are gaining popularity among American gardeners as well. These beautiful flowers are easy to maintain and will flower easily in almost any partly sunny location. Start your primulas by seed indoors and then move them outside when the weather warms in the spring. Then expect a colorful display of flowers during the second growing season.
Fill the seed-starting tray almost full with potting soil in late winter. Press the seeds into the top of the soil, spacing them approximately 1 inch apart. Cover the seeds with 1/4 inch of potting soil and spray the soil surface lightly with the spray bottle.
Place the seed-starting tray in a location with an overnight temperature between 55 and 60 degrees and a daytime temperature of approximately 15 degrees warmer. Keep the soil evenly moist by spraying with the spray bottle every day.
Watch for seedlings to emerge within three weeks. Keep the soil evenly moist. When the seedlings are 3 to 4 inches tall and have at least two true leaves, they are ready to move to an outdoor location. Ensure that the weather is at least 55 degrees overnight prior to transplanting the primulas.
Prepare a partly sunny growing area by working the soil with the garden spade down to a depth of approximately 5 inches. Add 1 inch of compost to the top of the soil and work this in with the spade.
Transplant the primula seedlings to the prepared growing area, spacing each plant approximately 6 inches apart. Make sure the crown of each seedling is at soil level. Firm the soil around the seedlings and water generously.
Apply 1 inch of mulch around the base of the plants to control weeds and protect the roots from summer heat and winter cold.