
Fours years ago we began fire mimicry treatments on an ancient, Ohlone-era coast live oak near Loma Mar, CA. Affectionately called Grandmother oak by the owners, she measures 17′ 8″ in circumference and is likely more than 500 years old. We started by clearing away the woody understory, removing nearby young firs and bays, and pruning off the dead lower limbs. Then we fertilized with compost tea and alkaline-rich minerals, and applied a limewash to the trunk. We repeated the fertilization treatments for two additional years. Above and below are photos showing how Grandmother oak has responded to care we gave her. She sure seems happier and more vibrant to me!


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