Evergreen Shrubs: Care and Growing Guide

Why your yard needs evergreen shrubs

Evergreen shrubs solve the biggest visual problem in American gardens: what the yard looks like from November through April. They hold foliage through winter, providing structure and screening when everything else is dormant. Without them, most US yards go bare for 5–6 months.

The National Gardening Association reports that privacy screening is the primary reason US homeowners plant evergreen shrubs, cited by over 60% of buyers. Year-round structure and low maintenance rank second and third.

The problem most buyers face is species selection. Boxwood planted in Zone 4 winter-kills. Arborvitae planted in deep shade grows slowly and opens gaps. Yew planted in wet clay dies. The guide below matches species to conditions so you don’t repeat the most common mistakes.

Best evergreen shrubs for US gardens

What USDA zones work for evergreen shrubs?

Most widely sold evergreen shrubs perform best in USDA Zones 4–8. Some species extend cold hardiness to Zone 3; others fail below Zone 6.

Zone-by-zone breakdown:

• Zone 3 (northern Minnesota, Montana, northern New England): Arborvitae ‘Emerald Green’, Eastern Red Cedar, common juniper. Boxwood fails here.
• Zones 4–5 (Midwest, mid-Atlantic, New England): Full species range available. All major evergreen shrubs perform, including ‘Green Giant’, yew, boxwood, and holly.
• Zones 6–7 (Virginia, Tennessee, Pacific Northwest, northern California): Best zone range for variety. All major species thrive.
• Zone 8 (Gulf Coast, coastal Pacific): Holly and native species do well. ‘Green Giant’ arborvitae still performs in Zone 8. Standard arborvitae struggles with summer heat in humid Zone 8.
• Zone 9+ (Florida, Texas, Southwest): Different plant list. Wax myrtle, yaupon holly, and Indian hawthorn replace northern species.

Confirm your exact zone at the planting zones guide before purchasing.

How to plant evergreen shrubs

Plant in early fall (September through mid-October) or early spring. Fall planting in most US zones is superior: cooler temperatures let roots establish without summer heat stress.

Hole preparation is critical. Dig the hole 2–3 times wider than the root ball but no deeper. The top of the root ball should sit level with — or 1–2 inches above — the surrounding soil. Planting too deep is the leading cause of death for newly planted evergreen shrubs. The buried bark rots.

Spacing for a privacy screen:

• ‘Green Giant’ arborvitae: 6–8 feet apart (not the 4-foot minimum on the nursery tag)
• ‘Emerald Green’ arborvitae: 3–4 feet apart
• Boxwood formal hedge: 2 feet apart
• Blue Point Juniper: 4–5 feet apart for a solid screen

In my own Zone 6b garden, I planted ‘Green Giant’ at 5-foot spacing. By year four, the plants had merged and interior branches were dying from lack of light. I couldn’t fix it — cutting into bare wood on conifers produces permanent brown patches. The lesson: always give arborvitae more space than the minimum. Eight feet between ‘Green Giant’ plants gives you room to maintain them for decades.

After planting: Water deeply (2–3 gallons per foot of plant height) and apply 3–4 inches of mulch from 6 inches out from the trunk to 3 feet out. Keep mulch off the stem — contact between mulch and bark causes rot at the crown.

Sun, soil, and water needs

Full sun (6+ hours of direct sun) maximizes growth rate, density, and disease resistance for most evergreen shrubs. Most species tolerate part shade but grow 30–50% slower.

Soil drainage matters more than soil type. Plants in poorly drained soil develop crown rot within 2–3 years. Test drainage before planting: dig a 12-inch hole, fill with water, and watch how fast it drains. Faster than 2 inches per hour is good. Less than 0.5 inches per hour means poor drainage. In poor drainage, raise the planting bed by 6–8 inches or choose a wet-tolerant species like inkberry holly.

Watering after planting:

• First growing season: water deeply once per week when rainfall is below 1 inch
• Second year: water every 10–14 days during dry spells
• Established (year 3+): no supplemental water needed in most of Zone 5–7

In Zone 8 and in western dry climates, established evergreen shrubs still benefit from a deep watering every 2 weeks through summer when temperatures exceed 95°F.

For seasonal flowering interest around an evergreen backbone, see flowering bushes for deciduous shrubs that add color from spring through fall.

How and when to prune evergreen shrubs

Prune evergreen shrubs in late spring, after the new growth flush has hardened off. In most US zones, this means May through mid-June.

Never prune in late summer or fall. New growth produced after a late-season pruning won’t harden before frost. The soft tips die back and leave brown patches that persist for 2–3 years.

Pruning guide by species:

Arborvitae and juniper share the most important rule: never cut into wood older than the current or previous season’s growth. The inner wood is brown and bare. It will not produce new green growth. Any cut beyond the green zone creates a permanent brown area.

Boxwood is the opposite. It regenerates from old wood and tolerates hard renovation pruning. A badly overgrown boxwood can be cut back to stubs and will regrow fully over 2–3 seasons.

Using evergreen shrubs for privacy screening

A row of ‘Green Giant’ arborvitae provides the fastest privacy screen available at US garden centers. From 6-foot nursery stock, expect visual closure by year 3–4 at proper spacing.

Cost comparison for a 40-foot privacy screen (2025 US pricing):

In my Zone 6b planting, five ‘Green Giant’ trees at 8-foot spacing were 9 feet tall in year two. By year three, canopy overlap was sufficient to fully screen the neighboring structure — about $350 worth of nursery stock versus $2,000+ for a fence.

For full design plans using evergreen shrubs as screening, see backyard landscaping ideas and landscaping ideas for placement approaches that combine evergreen structure with seasonal color.

Companion plants for evergreen shrubs

Evergreen shrubs work best as a backdrop or structure plant, with seasonal color in the foreground.

In front of an evergreen screen or hedge:

• Flowering bushes: forsythia, weigela, and lilac add spring and summer bloom in front of a dark green arborvitae hedge
• Full sun perennials: coneflower and rudbeckia fill the front of a border with summer color
• Deer-resistant perennials: critical in high-deer areas where arborvitae is frequently browsed

Plants to avoid near conifers:

• Spreading junipers planted close to arborvitae will merge branches — both plants develop dead zones where they touch
• Black walnut trees: the juglone they release inhibits arborvitae and yew. Keep evergreen shrubs at least 50 feet from black walnut.

Common problems with evergreen shrubs

Bagworms are the most destructive pest of arborvitae, juniper, and Eastern red cedar in the eastern and midwestern US. Bags hanging from branches contain caterpillars that eat foliage from the inside out. Remove bags by hand in fall and winter (each bag holds up to 1,000 eggs). Spray with Bacillus thuringiensis (Bt) in late May when larvae are small and active.

Winter browning on arborvitae is caused by desiccation — cold wind draws moisture from foliage before frozen ground can replace it. Apply an anti-desiccant spray in November and again in January. Most winter-browned foliage greens back by June.

Boxwood blight is spreading rapidly through US nurseries and established plantings in Zones 5–8. Symptoms include circular brown spots on leaves, black streaks on stems, and sudden defoliation. There is no effective treatment. Remove infected plants and avoid replanting boxwood in the same soil for several years. The NC State Extension boxwood blight resource has current US identification photos and management options.

Deer browse is heaviest on arborvitae and yew. In high-deer areas, protect new plantings with wire cages (3-foot diameter, 5 feet tall) for the first two winters. Once plants reach 8–10 feet, deer browse becomes manageable. See deer-resistant flowers to fill in around shrubs with plants that deer avoid.

Spider mites cause stippled, yellowing foliage and fine webbing on juniper and arborvitae in hot, dry conditions. A strong stream of water disrupts most colonies. Severe infestations need miticide applied in the morning when mites are active.