Ideal Temperature for Japanese knotweed
Images of Japanese knotweed
Signs of Cold Stress in Japanese knotweed
Symptoms
Japanese knotweed tolerates cold well and flourishes optimally when temperatures exceed 60℉. In winter, it should be maintained above 50℉. If the temperature drops below 32℉, while no immediate changes might be apparent in winter, spring may see reduced or absent sprouting.
Solutions
In spring, remove any sections that have not sprouted.
Signs of Heat Stress in Japanese knotweed
Symptoms
During summer, Japanese knotweed should be kept below 77℉. When temperatures surpass 86℉, the plant's leaves might lighten, curl, become prone to sunburn, and in severe instances, the entire plant could wilt and dry out.
Solutions
Remove any sun-damaged and desiccated portions. 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.
