From the Eberron Campaign Setting book:
Another of the unusual woods of Aerenal, livewood is a green-colored hardwood with a highly magical nature. When livewood trees are felled, they do not die, though they stop all growth. Livewood can be worked like normal hardwood, while it remains completely alive. In most respects, livewood is just like normal wood.
A few spells affect livewood in different ways from normal wood, however. Plant growth causes worked livewood to sprout small branches and leaves, though diminish plants has no effect. Speak with plants allows a character to communicate with a livewood object, though such an object has no more awareness of its surroundings than most normal plants. Blight deals damage to a livewood object as if the object were a plant creature (1d6 points of damage per level; the wood’s hardness does not apply). A character can use tree stride to move from one livewood object to another, or from a livewood tree to a livewood object (and vice versa), as long as the livewood object is large enough. Animate plants can animate a livewood object.
Dryads occasionally make their homes in livewood trees instead of oak trees. Such a dryad looks no more kindly upon the felling of her tree than other dryads do, but the felling of her livewood tree does not kill her—nor does it end her dependence on the tree. As a result, dryads can be found within livewood objects, including buildings, furniture, and ships.
Price: Livewood has hardness 6 and 10 hit points per inch of thickness. The cost of a livewood item is half again as much (+50%) as a normal wooden item. Items without wooden parts, including armor and bladed weapons, can not be made from livewood.