Answer: Comfrey is a hardy plant and grows so vigorously that it can overtake an area in a single growing season. Cutting your plant back will only encourage additional stem and leaf growth. Go ahead and cut away the flowering stalk. As you're harvesting, allow some leaves to remain near the soil level to help feed the roots. Although the plant will quickly replace any stems and leaves that are cut away, leaving a few will keep it producing for you. The allantoin content in comfrey is concentrated in the fastest-growing part of the plant. In winter, it will be concentrated in the root area (rhizome). In spring and summer allantoin will be concentrated in the leaves. Hope this information helps!
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