LEAF BULBS Most inflorescences on cannabis plants occur at the nodes where the stems originate. However, leaf buds can also be formed at the base of the leaves themselves. This is an unusual (albeit beautiful) mutation. It can also be beneficial to grow such plants as they develop more bud sites. Experienced growers, however, mostly remove them when they arise, since they otherwise absorb nutrients that are then no longer available to feed the main flowering sites.
https://www.royalqueenseeds.de/blog-die-bei-cannabispflanzen-am-haufigsten-auftretenden-mutationen-n727