Pseudotsuga | ''Tolmiea menziesii'' amongst bedstraw at Eglinton Country Park | ''Discurria insessa'' grazing on the feather boa kelp ''Egregia menziesii |
All told, the arboretum contains more than 800 varieties of trees and shrubs, with extensive collections of Chamaecyparis, Juniperus, Taxus, and Thuja, as well as roses and fine specimens of Acer griseum, Cornus controversa, Cupressus sempervirens, Juniperus deppeana, Pseudotsuga menziesii, and Quercus pyrenaica.
The larvae bore the cones of various coniferous trees, including Picea glauca, Picea engelmannii, Pseudotsuga menziesii, Abies balsamea, Pinus resinosa and Pinus banksiana.
Though there are generally few other plants in the habitat, associated species may include Pinus edulis, P. ponderosa, Pseudotsuga menziesii, Rhus trilobata, Cercocarpus montanus, Ribes cereum, Eriogonum jamesii, Opuntia polyacantha, Echinocereus triglochidiatus, Heterotheca villosa, and Yucca glauca.
Caterpillars of Declana from New Zealand, also tentatively placed in the Nacophorini, have been found on Myrtaceae (eucalyptus, Kunzea and Leptospermum), Pinaceae – larches (Larix), pines (Pinus, notably Monterey Pine, P. radiata) and Coast Douglas-fir (Pseudotsuga menziesii) –, and southern beeches (Nothofagaceae).