Ideal Temperature for Common vervain
Images of Common vervain
Signs of Cold Stress in Common vervain
Symptoms
Common vervain tolerates cold well and flourishes optimally when temperatures exceed 60℉. In winter, it needs to be maintained above 50℉. If the temperature drops below 40℉, while no immediate changes might be apparent in winter, reduced or absent sprouting could occur in spring.
Solutions
In spring, remove any sections that have not sprouted.
Signs of Heat Stress in Common vervain
Symptoms
In summer, Common vervain should be kept below 75℉. When temperatures surpass 85℉, the plant's foliage might lighten, curl, become prone to sunburn, and in severe instances, the whole plant could wilt and dry out.
Solutions
Prune off any sun-damaged and desiccated portions. Relocate the plant to a spot offering protection from the midday and afternoon sun, or use a shade cloth for cover. Water the plant in the morning and evening to maintain soil moisture.
