Am I grounded when I touch a tree?
Trees are made of wood, which is an insulating substance that does not ground you. However, the sap of the tree is grounded and so trees do have the ability to ground you, especially when the tree is wet from rain or moist from humidity. The grounding effect from a tree isn't as strong as when you're in direct contact with the Earth because wood is insulating, but it is still generally present.
If you'd like to know for sure if a certain tree will ground you, test it with a voltmeter.
