Associated plants include Alnus rubra, Filipendula occidentalis, Rubus parviflorus, Rubus spectabilis, Saxifraga occidentalis, Saxifraga nuttallii, Saxifraga mertensiana, and Mimulus guttatus, though it often grows on slopes with few other plants around.
Saxifraga | Pimpinella saxifraga | Saxifraga mertensiana | A larval web in an inflorescence of ''Pimpinella saxifraga |