As long as the vine is healthy, the cane is not too long and not overburdened, then the fruit should be relatively uniform along the cane. If any of these conditions are degraded, the fruit in the center of the cane may have lower quality.
- The fruit at the end of the cane is typically better quality due to the vine's natural growth habit. The end shoots typically are more vigorous as they are looking to climb - they are vines after all. This means the end shoots are drawing greater energy from the vine in hopes for growing into an ideal location to produce fruit (aka ripen seeds.) The clusters on these end shoots are the beneficiaries of the increased vascular tissue activity.
- Another view is that we want to space the fruit out along the cane. Early in the year this can be done by cutting large clusters in half. The result is the top half of the cluster remains on the vine and the clusters are evenly spread across the cane. I think this is easier to do with large clustered varieties such as Dolcetto or Syrah.