The optimal time for gathering Verbascum thapsus is dictated by the intended use of the plant. Leaf collection primarily occurs during the first year of growth, prior to the flowering stalk’s emergence. Root harvesting typically takes place in the autumn of the first year, or early spring of the second year, after the plant has established itself but before it directs significant energy into flower production. Flowers are gathered as they bloom throughout the summer months of the second year.
Timing collection properly maximizes the potency of desired compounds within the plant. Harvesting at the right stage ensures the material contains the highest concentration of mucilage in the leaves, beneficial compounds in the roots, or appropriate pollen levels in the flowers. Historically, the plants various parts have been employed for respiratory support, skin soothing applications, and as a source of natural dyes. The effectiveness of these applications is significantly impacted by the plant’s maturity during collection.
