French Lavender in Illinois (Zone 5-6): Must Overwinter Indoors

French lavender (Lavandula dentata) is zone 8–9. In Illinois (zone 5–6), it will not survive outdoors.

Indoor Winter Care

• Pot each plant individually (12"+ deep).
• South/east window, 6h+ sun.
• Water weekly max. No soggy soil.
• Cool room (50–60°F) preferred.
• Watch for whiteflies – common indoor pest.

Spring Transition

After frost, acclimate 7–10 days (shade → sun). Plant outdoors or keep in pots. Add lime annually.

Hardy Alternative

For outdoor lavender in zone 5–6: English lavender (L. angustifolia) 'Hidcote', 'Munstead', 'Phenomenal'.

Resources

Gardens Alive (gardensalive.com) for organic whitefly controls.