Basic Sowing Information for the Species Common/Latin Name: Matthiola incana Type: Tender annual Temperature: 15-20°C Cover: Average layer vermiculite or compost Date: Sow Nov - to late winter Advice: Grow cool after emergence of seed to encourage colour differentiation for selection on selected varieties only. Only the pale yellow/green seedlings will produce double flowers. Discard green seedlings. Biennials see description for sowing information