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Three blueberry ( Vaccinium  section  Cyanococcus ) genotypes, that have different chilling requirements and levels of cold hardiness, were studied. Depth of dormancy was evaluated and water status was determined, using nuclear magnetic resonance (NMR), throughout the accumulation of chilling that leads to release from dormancy. Among the two highbush cultivars studied, `Bluecrop' ( Vaccinium corymbosum  L.) was the most dormant and `Gulfcoast' ( Vaccinium corymbosum  L. x  Vaccinium darrowi  Camp) was the least dormant. The rabbiteye cultivar `Tifblue' ( Vaccinium ashei  Reade) had an intermediate dormancy. It appeared that the cultivar with the deepest dormancy had also the highest chilling requirement (CR). The NMR results showed that `Bluecrop' buds had the lowest relaxation times (T2), indicating that water was relatively more bound in `Bluecrop' buds than in the buds of the two other cultivars. Whatever the cultivar, no significant variation of T2s and water content of the buds was noted throughout the accumulation of chilling, even after CRs were satisfied. Within 1 day of forcing (24 °C, long day), there was a shift towards freer water but no change in the water content. Forcing was ineffective in freeing water until the plants received enough chilling to satisfy their CRs.

Water Status in Relation to Maintenance and Release from Dormancy in Blueberry Flower Buds