Onosma thrives in strong, direct light conditions and prefers well-draining soils with a neutral to alkaline pH. While tolerant of drought to some extent, onosma requires regular watering, allowing the soil to dry out partially between sessions. Temperature-wise, onosma favors warmer climates and might struggle in extreme cold. Common challenges for onosma include root rot from overwatering and potential susceptibility to pests like aphids. Seasonally, onosma requires less water in winter and may benefit from mulching to protect against cold temperatures. Adjustments in care, such as reduced watering and protection from frost, are essential in autumn and winter months.