The opposite branching turned out to be very helpful for me. I'm able to walk around my backwoods and easily ID with this method. Added bonus was a having the binoculars in hand with a Bald Eagle perched on a nearby limb.
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No, you will get sap from numerous other species walnut, birch and many soft maples. In Europe where they dont have maples they often tap birch. Problem is all of the other trees typically have <1% sugar so you're boiling 80l of sap to get a little of very dark, strong tasting syrup!
True, and all of those will make sweet sap.Butternut is actually quite nice in with the Maple. You won't get any sap out of an Oak, Ash, or Basswood though....I've accidentally tapped them all.