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Ministry of Agriculture, Food and Rural Affairs


The goal in managing weeds is to maximize yields - by suppressing weed competition during critical periods of crop development.

This concept is called the Critical Weed-Free Period, when it is most important to control weeds to prevent competition with crops. It is important to understand these facts about the Critical Weed-Free Period:

Critical Weed-free Periods for grapes
Grapes, new plantings First 8 to 12 weeks immediately after planting.
Grapes, 2nd and 3rd year First six weeks after bud break, then mid-August to first frost.
Grapes, bearing Mid-June through mid-July, mid-August through harvest.

There are other valid reasons to control weeds outside of these critical periods such as:

Controlling weeds outside of the CRITICAL WEED-FREE PERIOD will NOT increase yields.