Definition - What does Compound Bud mean?
The compound bud of a grapevine is actually a dormant bud (sometimes referred to as an "eye"). The compound bud makes up three points from which the vine grows. These points are called primary, secondary and tertiary buds. They are each found in one bud, and they are packed together within a set of external bud scales.
WineFrog explains Compound Bud
The compound bud is made up of three anatomical parts, and it can be found on the main vine trunk where new growths will be made each season. These three parts are covered in a protective scale within the compound bud.
The compound bud is the primary growing part making up the axillary bud, and it is also called dormant, as it does not often sprout within the same growing year that it forms.