crown bud
Horticulture
noun
1A bud on the crown of a root or tuber.
2A main, upper, or apical bud on a stem or branch; especially the first flower bud to form on a chrysanthemum plant (more fully first crown bud) or, if the first is removed, the second such bud (more fully second crown bud).
Origin
Mid 18th century; earliest use found in Practical Husbandman & Planter.