Plant Cold Trauma - Ask Extension
I have a Pinot Noir vine growing on my terrace. Last winter in Gresham we had an 11 degree day. The vine appeared dead this spring, but I left it inta...
Knowledgebase
Plant Cold Trauma #877782
Asked July 18, 2024, 12:28 PM EDT
I have a Pinot Noir vine growing on my terrace. Last winter in Gresham we had an 11 degree day. The vine appeared dead this spring, but I left it intact in the soil. Because it is adjacent to other plants it has received regular waterings this spring. It is now the middle of July, and I noticed that the vine is growing leaves. Is this a response to the shock of the cold weather?
Multnomah County Oregon
Expert Response
Grapevines can withstand temperatures as low as 11°F, but this is a moving scale based on the vine's dormancy stage. If you have not seen any growth until now, my guess is that the growth is coming from the base of the vine and not further up on the aerial parts of the vine. Is this the case? If so, then the vines are regrowing from the roots while the upper portions have died.
Grapevines that are growing from the roots can be successfully retrained to be healthy grapevines in home landscapes. However, if the vine was grafted onto a rootstock, what grows below ground will not be the same Pinot noir vine you had on top.
Grapevines that are growing from the roots can be successfully retrained to be healthy grapevines in home landscapes. However, if the vine was grafted onto a rootstock, what grows below ground will not be the same Pinot noir vine you had on top.
The plant growth is from the aerial vines, not from the roots. I think it is odd that the plant would go dormant until July. This is not a problem as the plant is ornamental and not raised for an economic purpose. I am just curious for your comments on this. Thank you. On Fri, 19 Jul 2024 19:03:10 +0000 "Ask Extension" <ask> wrote: ></ask>
It is possible that the damage to tissues caused a delay as it repaired what viable tissue was remaining to allow growth. I suggest pruning the vine carefully this winter to examine the vine trunks for damage.
The very late growth indicates that there was some trauma with the primary buds (buds that grew the season prior). What grew out likely was from adventitious buds on the older wood, and that likely is what you were seeing.
This winter, be sure to prune the vine, any time from Feb to March and maintain buds on wood that grew last summer. If you need direction on pruning, we have resources at https://extension.oregonstate.edu/crop-production/wine-grapes.
This winter, be sure to prune the vine, any time from Feb to March and maintain buds on wood that grew last summer. If you need direction on pruning, we have resources at https://extension.oregonstate.edu/crop-production/wine-grapes.
