Each of the following features can be easily tweaked and customized to your liking:

• Scale: general scale of the texture. Works the same as any other texture. Affects displacement accordingly.
• Vertical Stretch: how much the texture is scaled vertically (UV y direction).
• Wood 1 Color: Color of the upper layer of the bark wood.
• Wood 2 Color: Color of the lower layer of the bark wood.
• Wood Color Variation: Controls the mix between Wood 1 Color and Wood 2 Color.
• Moss 1 Color: Color of the lower layer of moss, concentrated within the cracks.
• Moss 1: Amount of lower-layer moss.
• Moss 2 Color: Color of the upper layer of moss.
• Moss 2: Amount of upper-layer moss.
• Displacement: Overall strength of the displacement of the material. It may be necessary to calibrate depending on the object's size.
• Large Bumps: Height of bumps between cracks. Affects displacement.
• Medium Bumps: Height of bumps within the large bumps. Affects displacement.
• Small Bumps: Height of smaller bumps, the overll texture of the wood. Doesn't affect displacement, only the bump map.
• Cracks: Depth and span of the cracks in between large bumps.
• Randomness: Randomness of the bumps. 0 is mostly in a grid, while 1 is completely random.
• Seed: Random seed for the textures used. To have variability between different trees, plug the random output of an Object Info node into this input.
• Wetness: How wet the wood is. Mainly affects roughness and clearcoat of the material.