I have a few wine grapes and wish to know WHEN it is best to water them. Presently, the vines are finishing the bloom phase and setting the grapes. I am in Sonoma County CA and it has not rained for over a month but the ground is deep and has sufficient clay in the soil to retain moisture; the vines are growing well now and show No Stress.
Last year, I watered twice: once in late Spring and again in mid-Summer (after veraision). Waterings are always Deep, so as to saturate the root zone.
What do you think?
Thank you. Russ