Every year we put our cold sensitive varieties, like Cabernet Sauvignon, to bed. The first step is to do a rough pruning to be able to work around the vines. This year is the second year that we have used foam insulation over the graft unions. This will provide a green house effect utilizing the ground warmth to moderate the temperature around the vine. Coupled with the straw that is put over the foam it keeps the graft unions at a balmy 20 to 40 degrees F even when temps fluctuate between minus 15 to over 60 degrees.
As you enjoy that bottle of Creekbend Cabernet or Pinot Grigio this winter you can be sure it is safe and cozy under the straw and foam.