The Heart Tree is an important part of the lore of A Song of Ice and Fire, especially for the Starks. Here’s a scene of Ned Stark sharpening Ice under the Heart Tree in the Godswood at Winterfell as seen in Game of Thrones Season 1.
A Heart Tree is a white weirwood tree that has a face carved into the trunk. The leaves and sap of the weirwood is red and the red sap sometimes makes the face seem like it is crying red tears.
Dark red leaves are from Escape from Mirkwood Spiders (The Hobbit 79001)