Proliferation of many shoots near the end of a branch in response to the death of the terminal bud
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witches' broom (Wikipedia)
For the Witch's Broom Nebula
Witch's broom or witches' broom is a deformity in a woody plant, typically a tree, where the natural structure of the plant is changed. A dense mass of shoots grows from a single point, with the resulting structure resembling a broom or a bird's nest. It is sometimes caused by pathogens.
Witch-broom disease caused by phytoplasmas is economically important in a number of crop plants, including the cocoa tree Theobroma cacao,
jujube (Ziziphus jujuba) and the timber tree Melia azedarach.