Softwoods contain only tracheids.
Heart Shaped Heartwood Heartwood is the xylem in the center of the tree that has stopped conducting water and minerals and is storing waste products from the plant. These waste products are of various types. In redwood trees these materials causes the heartwood to turn red. These products help to preserve the wood, particularly in redwoods. Heartwood can be contrasted with Sapwood , particularly in redwoods, because the heartwood is red and the sapwood is white.