Some plants are evergreen until their particular threshhold temperature is reached. These plants are categorized as Semi-evergreens and they offer beauty at a valuable time of the year. True evergreens are attractive but offer only dull color to the winter landscape often taking on a dark greenish or purple color. By adding semi-evergreens to your planting design,bright greens and reds can be used during part of the winter. Usually a zone 5 or 6 winter will finally defoliate this plant group by the end of December or the First of January. After defoliation, the will die back to the ground similar to a dormant perennial or become a deciduous shrub. Actual root death for these plants will likely occur if temperatures reach -20, so most semi-evergreens will not survive in zone 3-4. Grasses and Some perennials have attractive dried foliage during the winter. While these plants are not considered semi-evergreens, they are an important element in the landscape. They offer structure, texture, and earth-tone colors during the winter. The following plants are semi-evergreens in zone 5-6: Nandina (all cultivars) Glossy abelia Red-tip photenia Silverberry eleagnus Japanese aucuba Itea-Sweetspire (persistant fall color) Hardy palms Lavatera (malva) Artemesia (Powis Castle) Winecups (poppy mallow) Hellebore (lenten rose) Bergenia Epimedium (barrenwort) Hardy Ferns (some species) Liriope (monkey grass) Italian Arum Cast-iron plant Heucheria (coral belles) Hardy Geraniums (some cultivars) Euphorbia (spurge) Creeping Sedums (depends on species) Penstemon (husker red) Ice plant (delosperma) Lavender Rosemary Lambs ears Amsonia (persistant fall color) Evergreen Groundcover Bamboo(most species) Fothergilla (flowers early-leaves delayed) winter damaged evergreen shrubs (most)