Ideal Temperature for Great St. John's wort
Images of Great St. John's wort
Signs of Cold Stress in Great St. John's wort
Symptoms
Great St. John's wort tolerates cold well and flourishes optimally when temperatures exceed 60℉. In winter, it needs to stay above 55℉. If the temperature drops below 50℉, while no immediate winter changes might be apparent, reduced or absent sprouting could occur in spring.
Solutions
In spring, eliminate any sections that did not sprout.
Signs of Heat Stress in Great St. John's wort
Symptoms
In summer, Great St. John's wort should be maintained below 75℉. When temperatures surpass 80℉, the plant's leaves might lighten, curl, become prone to sun damage, and in severe instances, the whole plant could wilt and dry out.
Solutions
Remove 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.
