Lodgepole pine is the most common associate of white spruce in the SBPS.
Typical understorey vegetation of moist spruce ecosystems includes the shrubs Lonicera involucrata, Rosa acicularis, Shepherdia canadensis, Juniperus communis, Salix glauca, Betula glandulosa, Ribes lacustre, R. hudsonianum and Viburnum edule, and the herbs Cornus canadensis, Linnaea borealis, Epilobium angustifolium, Petasites palmatus, Fragaria virginiana, Equisetum arvense, Calamagrostis canadensis and Mitella nuda.