Abstract
Variation in the rates of bud and cone development over 4 years was recorded in three clones of Pinus contorta Dougl. (lodgepole pine), growing in Central Scotland and quantitative analysis of bud development was performed. Axillary bud initiation began in late May and cone differentiation began in early to mid-July for both male and female cones. Female cones could be initiated until the end of August and male cones until mid-September. All the female cones on a bud started to develop within a few days of each other, but male cones take up to 6 weeks to all start developing. The implications of developmental differences are discussed in relation to the physiology of the bud.
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