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: April 2026 M T W T F S S 12345 6789101112 13141516171819 20212223242526 27282930 « Mar