Ideal Temperature for Common St. John's wort
Images of Common St. John's wort
Signs of Cold Temperatures in Common St. John's wort
Symptoms
Common St. John's wort tolerates cold well and grows optimally when temperatures are above 65℉. In winter, it needs to stay above 55℉. If temperatures drop below 41℉, while no immediate winter changes might be seen, spring may bring reduced or absent sprouting.
Solutions
In spring, remove any sections that have not sprouted.
Signs of High Temperatures in Common St. John's wort
Symptoms
In summer, Common St. John's wort should be maintained below 75℉. When temperatures surpass 86℉, the plant's leaves might lighten, curl, become prone to sunburn, and in severe instances, the whole plant could wilt and dry out.
Solutions
Remove any parts that are sunburned and dried. Relocate the plant to a spot offering protection from midday and afternoon sun, or use a shade cloth. Water the plant in the morning and evening to maintain soil moisture.
