A friend of mine has a very large, what dhe calls a Russian Olive. I loooked it up and it seems right. This one, or actually three together, is over ten feet tall, twenty feet diameter, and very full and dense. It is so dense that it is actually dieng slowly from the inside where it doesn't get enough sun. I suggested removing one within the group that is toast, and pruning. Any ideas? I am very new to this forum thing so I appologize if I am out of place.