How to Grow a Nellie R. Stevens Holly
Plant Nellie R. Stevens Holly in full sun on free-draining soil and give each plant 6 to 10 feet of clear space for a screen. The bush grows 2 to 3 feet per year and reaches 15 to 25 feet tall. Prune lightly in late winter to shape, and plant a male holly within 200 feet for the heaviest berry crop.
Where to plant
Nellie R. Stevens Holly is a broadleaf evergreen hybrid grown for fast dense growth and red winter berries. It is hardy in USDA zones 6 through 9 and reaches 15 to 25 feet tall and 8 to 12 feet wide at maturity in roughly 10 to 12 years. Pick the spot for the mature size now, since the plant resents being moved once established.
Sun
Six to eight hours of direct sun produces the densest growth and the heaviest berry set. Nellie R. Stevens Holly tolerates part shade and will grow there, but the form gets looser and berry production drops. For a privacy screen, give the row as much sun as the site allows.
Drainage
Free-draining soil is required. Roots in standing water rot quickly. Dig a one-foot test hole and fill it with water. If it drains within a few hours, the spot is fine. If water sits overnight, build a raised mound 8 to 12 inches above grade and plant on top of it.
Soil
Nellie R. Stevens Holly prefers a slightly acidic loamy soil rich in organic matter. Work a few inches of compost into the planting area before setting the plant in. The plant tolerates clay better than most evergreens as long as drainage is corrected, but it suffers in chalky alkaline ground.
Space and pollination
For a hedge or screen, space individual plants 6 to 10 feet apart. Tighter than 6 feet crowds the root zones and reduces airflow inside the row. Nellie R. Stevens Holly is female. A compatible male pollinator within about 200 feet produces a much heavier berry crop, though some berry set happens even without a nearby male thanks to pollen from neighborhood hollies.
How to plant
Plant in fall or early spring while temperatures are mild and rainfall is reliable. Container-grown plants can go in through the growing season, but the roots establish fastest in cool weather. Avoid planting in the heat of midsummer in the warmer end of the zone range.
-
1Dig a wide shallow hole Twice as wide as the root ball but only as deep. The roots spread sideways more than down, so a wide hole helps establishment far more than a deep one.
-
2Loosen the root ball If the roots are circling tightly inside the nursery pot, gently tease them apart or score the outside with a knife. Circling roots stay circling unless you break the pattern, even after the plant is in the ground.
-
3Set the plant slightly high The top of the root ball should sit about an inch above the surrounding soil. The plant settles as the soil compacts, and a buried crown rots faster than a high one.
-
4Backfill with native soil and compost Mix a few handfuls of compost into the dug-out soil and use that to fill the hole. Avoid pure compost or potting mix in the planting hole, since roots get lazy in overly rich soil and never spread into the wider yard.
-
5Water deeply Soak the entire root zone until the top foot of soil feels uniformly damp. This is the most important watering of the plant's first year and helps the root system make contact with the surrounding soil.
-
6Mulch two to three inches deep Use shredded bark or wood chips, kept a few inches back from the trunk. Mulch keeps the shallow root zone cool, holds moisture between waterings, and reduces grass competition during establishment.
Watering and feeding
Watering
Water deeply once a week through the first growing season to establish the root system. Soak the root zone rather than splashing the leaves. Drip irrigation or a soaker hose at the base works best.
After the first year, Nellie R. Stevens Holly is fairly drought tolerant and gets by on rainfall in most years. A deep weekly soak through extended summer dry spells keeps the foliage looking fresh and supports berry development through the second half of the year.
Feeding
Feed once in early spring as new growth starts, using a slow-release product labeled for evergreens or acid-loving plants. The plant is a heavy feeder for the first few years while it puts on rapid size.
An established hedge benefits from a light second feeding in early summer to support the next flush of growth. Stop feeding by midsummer so the new wood hardens off before winter. Avoid heavy nitrogen, which produces soft growth at the expense of berries.
Pruning
Nellie R. Stevens Holly takes pruning well and is one of the easiest hollies to keep at a chosen size. The best time to prune is late winter, just before the new growth pushes. Berries form on the previous year's wood, so heavy pruning later in the season removes the berry display.
Shaping a young hedge
Keep the base wider than the top. Sunlight needs to reach the lower branches, otherwise the bottom thins out and never recovers. Picture a soft pyramid rather than a perfect rectangle.
Trim lightly each year for the first three to four years. Hard cuts on young growth slow establishment. Each light trim encourages denser branching and a tighter screen.
Annual maintenance trim
Once established, trim once in late winter to shape and again lightly in early summer if the hedge has pushed past the target size. Take only the new growth on the summer trim. Heavy summer cuts remove the developing berries.
Remove dead, broken, or crossing branches at any time. Cut back to a side branch or the main stem rather than leaving stubs.
Renovating an overgrown plant
Nellie R. Stevens Holly tolerates hard renovation better than most evergreens. If the plant has outgrown its space, cut it back hard in late winter even into older wood. Fresh growth pushes from buds along the trunk and main branches within a couple of months. Expect to lose that year's berry display but gain a denser plant by the following year.
Blooming and color
Nellie R. Stevens Holly is grown for the year-round dark green foliage and the heavy crop of bright red berries that persist through winter into early spring. Small white flowers appear in spring, but the berries are the real seasonal show.
Bloom timing
Small white flowers open in mid to late spring along the previous year's wood. The blooms themselves are easy to miss. The berries that follow them are the reason most growers plant this holly.
Berry display
Red berries set in summer, color up through fall, and persist through winter into the following spring. The display peaks once the leaves around the plant have dropped and the red shows clearly against the dark green foliage. A pollinator male holly within 200 feet produces the heaviest crop.
Berries hold well on the plant and are also commonly cut for holiday arrangements. A few branches in a vase hold for a week or more indoors.
Cutting for arrangements
Cut branches with heavy berry set in late fall through midwinter. Strip the lower leaves off the stems before placing in water and recut the bottom inch at a sharp angle. The cut stems hold for 7 to 10 days in a cool spot.
Common problems and pests
Most Nellie R. Stevens Holly complaints are scale insects on the stems and the occasional bloomless or berryless year from a missing pollinator or wrong-time pruning. The plant is otherwise low-maintenance.
No berries this year
Either no compatible male pollinator within range, or last year's heavy pruning removed the berry-bearing wood. Plant a compatible male holly within 200 feet to improve berry set. Switch the pruning schedule to late winter so the developing berries are not cut off in summer.
Yellow leaves between green veins
Iron deficiency, common on alkaline soil. The plant prefers slightly acidic conditions. Apply a chelated iron product as a foliar spray for fast correction and renew acidic mulch like pine bark or pine needles over the root zone. A soil test confirms whether the underlying issue is true iron shortage or simply alkaline soil locking up the iron the plant cannot use.
Bumps on stems and leaves with sticky residue
Scale insects feeding on sap and excreting a sugary residue. Wipe individual scales off with a cotton swab dipped in rubbing alcohol. Heavier infestations respond to horticultural oil sprayed in late winter while the plant is dormant. The sticky residue often grows black sooty mold, which washes off with soapy water once the scale is gone.
Leaves dropping in summer
Usually summer drought stress on a young plant or one in a hot exposed spot. Mulch two to three inches deep and water deeply through extended dry spells. Older established plants drop a few inner older leaves each year as part of normal renewal, which is not a concern.
Browning leaves and stem tips after winter
Winter burn from cold dry wind in zone 6 sites. The leaves brown but the buds underneath are usually fine. Wait until late spring before cutting anything back. Trim only the clearly dead tips once new growth pushes from healthy buds.
Leaf miner trails through the leaves
Squiggly tan or silver tunnels in the leaves, made by the larvae of a small fly. Damage is mostly cosmetic and the plant tolerates it well. Pick off heavily mined leaves and dispose of them. Heavy outbreaks across the whole plant respond to a systemic insecticide drench in spring.
Black sooty mold on leaves
A symptom rather than the underlying problem. The mold grows on the sticky residue left by scale or aphids feeding above. Treat the underlying pest with horticultural oil or insecticidal soap, and the mold washes off with soapy water once the pest is gone.
Powdery white film on new leaves
Powdery mildew, common in humid weather with poor airflow. Thin the densest interior branches at the annual late winter pruning to improve airflow. Avoid splashing the leaves when you water, soaking the soil directly instead. Heavy outbreaks respond to a horticultural oil or potassium bicarbonate spray.
Root rot in soggy soil
Yellowing leaves across the whole plant with soft mushy roots when checked. Caused by standing water at the root zone. There is no cure for a plant that is well into root rot, but a plant caught early recovers if drainage is corrected. Build a raised mound or move the plant to a better-drained spot.
Deer browsing
Deer mostly leave Nellie R. Stevens Holly alone thanks to the sharp leaves, but heavy deer pressure can still result in browse on softer new growth. Spray with deer repellent during the spring flush if browsing is a problem. Once the leaves harden off, the pressure usually drops on its own.
About This Article
