Plants for under a fir tree
What can I plant under an established fir tree?
Common douglas fir, Pseudotsuga menziesii, is a deep-rooting species. However, as in many other tree species, its root structure varies according to the nature of the soil. In deep, well-drained soils, taproots may grow up to 50% of their final depth in 3 to 5 years. Plate-like root systems develop when it grows in shallow soils or with a high water table. Fine roots are concentrated in the upper 20 cm of soil.