A Real Cut Up
Burls sometimes grow under ground. It is region and soil specific. You get in rocky areas and you will not find burls under ground. You get in soft loam dirt it is easier for burls to grow under ground. Most that I have dug up in my region it is what you see is what you get. The deepest in my region has been 12". Were in portions of California I have seen burl grow 4' under ground such as pictured above.