I know it's not an older tree, but if you need some AC seed to plant, let me know and I'll send you some in October. I usually get a bunch off of my main tree and happened to find 4 or 5 more trees that have nuts forming on them this year that I released with a mulcher.
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AC will often produce the year after being planted. AC likes rocky soil and dry conditions. I have 9 year old trees that survived 6 years of drought, are almost 20 feet tall, and will be loaded with nuts this year. AC is maybe the best wildlife tree I've planted.