![Cones on Douglasfirs this year! — Trees Pacific Northwest](/3wzg0da/526.jpg)
Cones on Douglasfirs this year! — Trees Pacific Northwest
02/05/2018 · May 2, 2018. Douglasfirs ( Pseudotsuga menziesii ), along with many other conifers, produce a heavy crop of cones only once every several years, in cycles. A cycle for Douglasfir cone production is typically 5 to 7 years long. Once every 5 to 7 years, Douglasfirs produce a heavy crop of cones. On the inbetween years, Douglasfirs produce a ...