Fig. 4. Mean (± s.e.) number of nodes of parent shoots (A) and winter buds (B) according to annual shoot type during the summer shoot extension. m.f.s., Monocyclic floriferous shoot; b.f.s.1, bicyclic floriferous shoot with one relay summer shoot; b.f.s.2, bicyclic floriferous shoot with two relay summer shoots; b.v.s., bicyclic vegetative shoot. Buds or shoots are located on the first (p1) or second (p2) node from the terminal inflorescence. Calendar dates and number of days from date of first observation (i.e. 16 Jun. 1993) are indicated.