Clarkia - Key Growing Information
DAYS TO GERMINATION: 5-10 days at 65-70°F (18-21°C)
SOWING: Transplant (recommended) - Sow 4 weeks before planting out. Lightly cover seeds with 1/16" soil. Harden off seedlings before planting out after last frost. Direct seed - As soon as the soil can be worked. Gently press seeds into soil, covering with 1/16" soil. Keep soil surface moist until emergence. Thin to 6-12" once seedlings have first true leaves. After germination, plants prefer cool growing conditions. Seedlings are best grown at 60–65°F (16–18°C) day temperatures/50°F (10°C) nights; should not exceed 75°F (21°C). High temperatures during plant development can cause weak, spindly stems.
LIGHT PREFERENCE: Sun. Tolerates part shade.
PLANT HEIGHT: Varies depending on variety.
PLANT SPACING: 6-12".
HARDINESS ZONES: Annual.
STEM LENGTH: 12-34".
VASE LIFE: 7-10 days.
HARVEST: Clarkia unguiculata: Harvest stems when the lower set of blooms is just beginning to open. Older blooms will drop off the stem within about 5 days. Unopened buds on the stem will continue to open up in the vase. Clarkia amoena: When first flower on the stem opens.
SOIL REQUIREMENTS: Average, well drained soil.
USES: Cut flowers, pollinator gardens, and border plant.
TIPS: Plants may benefit from a horizontal trellis / support.
SCIENTIFIC NAMES: Clarkia unguiculata, Clarkia amoena
ALTERNATE NAMES: Clarkia unguiculata: Mountain garland, elegant clarkia. Clarkia amoena: Farewell to spring, satin flower.