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How to Grow Carissa Holly

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Carissa Holly

Ilex cornuta 'Carissa'

shrub

Carissa Holly is a compact, evergreen shrub known for its distinctive spineless or nearly spineless leaves and bright red berries. It's a female cultivar of Chinese holly that produces ornamental fruit without the sharp spines typical of other holly varieties, making it safer for landscapes with children and pets.

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Example Carissa Holly timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Carissa Holly

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Carissa Holly

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Carissa Holly dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun to partial shade, 4-6 hours of direct sunlight daily for best berry production
💧
Water: Moderate watering; keep soil consistently moist but not waterlogged. Reduce watering in winter. Drought-tolerant once established.
📏
Spacing: 36 inches
📅
Days to maturity: Not applicable (ornamental shrub)
🌱
Planting depth: Plant at same depth as root ball; do not bury stem

Soil

Type: Well-draining, slightly acidic loamy soil
pH: 5.0-6.5
Amendments:
Peat moss Compost Perlite for drainage

Growing Zones

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Thrives in zones 5b-9a, with best performance in zones 6-8

5b 6a 6b 7a 7b 8a 8b 9a

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Growth Stages

1

Establishment

First 6-12 months

Young shrub settling into landscape with initial growth of new shoots and foliage

Water regularly (1-2 inches weekly), mulch around base, avoid heavy pruning. Monitor for transplant shock.

2

Vegetative Growth

Years 1-3

Shrub develops dense, compact form with glossy, spineless foliage reaching mature size

Maintain consistent watering, prune lightly in spring to shape, apply balanced fertilizer in early spring

3

Flowering

Spring (April-May)

Small, white to pale pink flowers appear on branches in spring, typically inconspicuous

Ensure pollinator access; female plants require nearby male holly for berry set. Do not deadhead.

4

Fruiting

Summer through winter (June-February)

Bright red berries develop on female plants where flowers were pollinated, creating ornamental display

Maintain consistent moisture during berry development. Avoid pruning during fruiting season. Berries persist through winter.

5

Dormancy

Late December to February

Plant slows growth in coldest months; foliage remains evergreen and berries provide winter color

Reduce watering but do not let soil dry completely. Protect from harsh winds in northern zones. No fertilizer needed.

Companion Planting

Plan your garden →

Plant with:

Boxwood Viburnum Azalea Rhododendron Japanese Pieris Nandina

Avoid planting near:

Black walnut (juglone toxicity) Trees that create dense shade

Common Pests

  • Spray with strong water stream, use miticide if severe, maintain humidity

  • Apply horticultural oil in dormant season, prune heavily infested branches

  • Spray with water, use neem oil, encourage beneficial insects like ladybugs

  • Use yellow sticky traps, apply insecticidal soap, spray with neem oil

Uses

🏠

Holiday Decorations

Household

Branches laden with bright red berries are excellent for holiday floral arrangements, wreaths, and mantelpiece displays. The persistent berries provide long-lasting seasonal decoration. [source]

🦋

Songbird Fruit Source

Wildlife

The abundant red berries attract songbirds including robins, waxwings, and thrushes in fall and winter, providing valuable natural food when other sources are scarce. [source]

🎨

Landscape Ornamental

Craft

The compact growth habit, spineless foliage, and persistent berries make it ideal for foundation plantings, shrub borders, and hedges where traditional spiny hollies would be unsafe. [source]

🏠

Low-Maintenance Evergreen Screen

Household

Serves as a year-round privacy screen or windbreak with minimal pruning requirements and excellent form retention in most climates. [source]

Harvest Tips

Carissa Holly is not harvested for consumption. Berries and branches may be cut in late fall or winter for decorative holiday arrangements; cut branches will continue to display berries indoors for several weeks.

Fun Facts

  • 🌱 Carissa Holly is a female cultivar, meaning it will only produce berries if a compatible male holly variety is planted nearby to serve as a pollinator—typically within 50 feet.
  • 🌱 Unlike most hollies with sharp, spine-tipped leaves that can cause injury, Carissa Holly's spineless foliage makes it exceptionally safe for planting near play areas and frequently visited spots.
  • 🌱 The berries are toxic to humans if ingested in quantity but are safe for birds, making Carissa Holly excellent for wildlife gardens while remaining suitable for family landscapes.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Cultivar Deadhead Full Sun Mulch Partial Shade Transplant
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