I do this as a hobby, so I don't have a refractometer, so not worrying myself over the sugar content. I don't care if the trees take a little longer to hit their stride and we're only getting icewater in the meantime. I'm collecting sap and boiling it down to nearup mostly for storage purposes. Once I get 40l into my grubby little paws I'll make a batch and go from there.

Meantime, this little, very mild cold snap may be enough to help right things. Hope so! :-)