New guy here.
This is my third year tapping trees. Last year I did 150 trees, this year I want to tap 2-250 trees.
I live in Northern Minnesota near Brimson. Minimal flow from the 6 test trees. It looks like the saap may start flowing this weekend.
My question is, if the ground is still frozen, how does the sap start flowing? I understand the sun can warm the tree up to get drips from my taps. I also understand the first flow is what was stored in the tree from last Fall. After the first flow, the sap has to come from the roots. If the ground is still frozen, how does the sap flow? Does the tree thaw out from the top down? I do notice the snow melting from the tree first but I am certain the rest of the ground is still frozen. What is actually happening?