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Limbing is another common method of pruning Cannabis plants. Many small limbs
will usually grow from the bottom portions of the plant, and due to shading they
remain small and fail to develop large floral clusters. If these atrophied
lower limbs are removed, the plant can devote more of its floral energies to the
top parts of the plant with the most sun exposure and the greatest chance of
pollination. The question arises of whether removing entire limbs constitutes a
shock to the growing plant, possibly limiting its ultimate size. It seems in
this case that shock is minimized by removing entire limbs, including
proportional amounts of stems, leaves, meristems, and flowers; this probably
results in less metabolic imbalance than if only flowers, leaves, or meristems
were removed. Also, the lower limbs are usually very small and seem of little
significance in the metabolism of the total plant. In large plants, many limbs
near the central stalk also become shaded and atrophied and these are also
sometimes removed in an effort to increase the yield of large floral clusters on
the sunny exterior margins.