I frequently refer to Ed Hellman's chart of grapevine principle growth stages, in the online publication Grapevine Structure and Function.
Here is a timeline of how the flowers look during the various stages until flowering:
Stage | |
Principal Growth Stage 1: Leaf development. Stage 13. 3 leaves unfolded. May 14, 2018 |
|
Principal Growth Stage 1: Leaf development. Stage 15. More leaves unfolded. May 28, 2018 |
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Principal growth stage 5: Inflorescence emerge. Inflorescences fully developed; flowers separating. June 12, 2018 |
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