Coleus plants can tolerate temperatures as low as 30°F for very short durations, but they thrive in warmer conditions
. Temperatures between 65°–75°F are ideal for maintaining vibrant foliage and preventing stress
. Here's what you should know about coleus and cold temperatures:
- Minimum Tolerable Temperature Coleus can handle a light frost, but prolonged exposure to freezing temperatures will likely kill them
. They can briefly tolerate temperatures down to 33°F, but this is too cold for them
- Ideal Temperature Range Coleus plants flourish when temperatures are consistently between 65° and 75°F during the day and above 60°F at night
- Signs of Cold Stress If a coleus is too cold, its leaves may darken or develop a water-stained appearance
. Frost can quickly damage or kill the plant
- Overwintering In areas where temperatures drop below freezing, coleus can be brought indoors to survive the winter
. They need bright, indirect sunlight and protection from drafts
. You can also take stem cuttings to propagate new plants
- Hardiness Zones Coleus thrives in zones 10a-11b, where winter temperatures are milder
. In zone 10a, coleus can tolerate temperatures down to 30°F, while in zone 11b, they are comfortable down to 50°F
- Frost Sensitivity Coleus are not frost-tolerant and are typically grown as annuals in regions with frost
. Frost can melt their foliage, causing the plant to die
- Other Considerations Coleus plants will droop and look unhealthy in temperatures below 50°F, and their growth will stop
. Consistent temperature monitoring can help prevent temperature-induced stress
