full bloom

The stage at which the flowers of top fruit trees are fully open; collectively, when 90% of the blossom on a tree or group of trees of one variety is open, attained closer to the beginning of the full bloom period than to the end. Full bloom is after first flower opening and before petal fall.

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
Read the preface. Order the book.