Boojum Tree Posted October 13, 2014 10:37 am & filed under . Idria columnaris Baja California Native. Thick base, dormant in summer; Slow to 50ft. 50ft? Wow. Very slow. So so slow… Hardy to 20F. Cactus and Succulents Bamboo Perennials Carnivorous Plants Airplants Search for: August 2026 M T W T F S S 12 3456789 10111213141516 17181920212223 24252627282930 31 « Mar