History of Westeros delves deep into Heart Trees & Weirwoods. As always, we discuss their history while poring over the details to learn as much as possible. We cover everything from tree dreams to blood sacrifice, the power of stumps, Bran’s visions, the cave of the Three Eyed Crow and an assortment of items made from weirwood… and quite a bit more. It’s such a huge topic we can’t even tease it all! Part 3 of our Weirwoods series is out now, view it here.

A leaf drifted down from above, brushed his brow, and landed in the pool. It floated on the water, red, five-fingered, like a bloody hand.

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The weirwood’s bark was white as bone, its leaves dark red, like a thousand bloodstained hands. A face had been carved in the trunk of the great tree, its features long and melancholy, the deep-cut eyes red with dried sap and strangely watchful. They were old, those eyes; older than Winterfell itself. They had seen Brandon the Builder set the first stone, if the tales were true; they had watched the castle’s granite walls rise around them. It was said that the children of the forest had carved the faces in the trees during the dawn centuries before the coming of the First Men across the narrow sea.

http://www.youtube.com/watch?v=08izO48s51I

I never knew that northmen made blood sacrifice to their heart trees.