Thuja Virginian™ is hardy in USDA zones 5–8 and performs best in full sun — at least six hours of direct light a day for the densest growth. It is not fussy about soil type but insists on good drainage; it will not tolerate sitting in soggy, waterlogged ground.
Planting
- Choose a site with full sun and room for the plant to reach about 14 ft. tall and 6 ft. wide.
- Dig the hole twice as wide as the root ball but no deeper than the root ball is tall.
- Set the plant so the root flare (where the trunk widens at the base) sits right at ground level — never bury the trunk.
- For a privacy hedge, space plants about 3–4 ft. apart on center. Tighter spacing fills in faster; staying near 4 ft. gives each plant a little more breathing room and airflow.
- Backfill with the native soil, firm it gently to remove air pockets, and water in deeply.
- Mulch 2–3 in. over the root zone to hold moisture, keeping the mulch pulled back a few inches from the trunk.
Care & maintenance
- Water. Water deeply and regularly through the first one to two growing seasons while roots establish. As an evergreen, it also needs water during dry spells in fall and early winter — a well-hydrated plant going into winter resists desiccation and browning.
- Feed. A light application of a slow-release evergreen or conifer fertilizer in early spring is plenty. Avoid heavy feeding late in the season.
- Light. Full sun keeps the foliage dense and the form tight. In too much shade it thins and opens up.
- Prune & shear. Arborvitae tolerates shearing well, so you can keep it formal or trim for height. Shear in late spring or early summer and stay within the green, foliage-bearing outer growth — avoid cutting deep into bare interior wood, which is slow to re-green.
- Spacing. For a continuous privacy screen, hold to roughly 3–4 ft. between plants so they knit into one solid wall.
- Pests & disease. Watch for bagworms, the most common arborvitae pest — pick off the small spindle-shaped bags by hand or treat early in the season before they spread. Good drainage prevents most root problems.
- Winter care. In snowy regions, gently brush heavy snow off the branches or tie the plant loosely with twine in late fall so wet snow and ice don’t splay the upright form.
- Deer. Arborvitae is a favorite browse for deer. Where deer pressure is high, plan to protect young plants with fencing or repellent through the winter months.