The "Marechal Foch" grape, a hybrid developed in France, is grown in the north and east vineyards because of its early harvest seasons and tolerance for cold weather. One of the red grape varieties, this plant has small fruits that forms in small groups. Growers should monitor the development of the fruit and the harvest when it reaches its peak of ripeness instead base harvesting time on the calendar.
Months of maturity
The Marechal Foch grape ripens as early as mid-August in some regions, such as Iowa. Upcoming dates of harvest vary from depending on the climate of the region and the actual weather during the spring and summer.
The quality of the fruit improved when later harvested in autumn. Tannin level decreases, while the blood glucose level increased. Testing done by Cornell University on grapevines in New York state showed an increase in quality by delaying the harvest about two weeks after the first signs the grapes are ripe.
Monitor the color
Color is the first sign of Marechal Foch grapes ripe. The fruit is rather small, compared with other grapes, and turns black in color when ripe. Monitor the color change and decide on the time of harvest on allowing the grapes ripen on the point of maturity is based.
Protect the Marechal Foch grapes from birds, while the cluster and ripen. This can be done with optical elements such as scarecrows or fluttering ribbons or bird netting. Spring thinning or pruning of the vines can also improve the quality of grape production. Thinning of the canopy over the grapes allows more sunlight to reach the fruit. It reduces the overall yield of the grapes, but also increases the quality of the fruit.