Ideal Temperature for Hoary mullein
Images of Hoary mullein
Signs of Cold Stress in Hoary mullein
Symptoms
Hoary mullein exhibits moderate resilience to cold and flourishes optimally when temperatures exceed 65℉. Throughout the winter, its environment should remain above 50℉. Should the temperature drop below 32℉, its foliage might begin to sag. Minor instances allow for recovery, but severe cases lead to wilting and eventual leaf drop.
Solutions
Remove any parts damaged by frost. Before subsequent exposure to low temperatures, cover the plant with materials like non-woven fabric or cloth, and erect a windbreak to shield it from cold gusts.
Signs of Heat Stress in Hoary mullein
Symptoms
In summer, Hoary mullein needs to be maintained below 75℉. When temperatures surpass 85℉, its leaves lighten in color, tips may dry and shrivel, foliage might curl, and the plant becomes more prone to sun damage.
Solutions
Prune off any sun-scorched and desiccated sections. Relocate the plant to a spot offering protection from the midday and afternoon sun, or deploy a shade cloth for cover. Irrigate the plant in the morning and evening to maintain soil moisture.
