Apollo Winterberry Holly
Ilex serrata × Ilex verticillata 'Apollo'Apollo Winterberry Holly is a deciduous male hybrid holly valued primarily for its role as a pollinator for female winterberry selections. Developed by the U.S. National Arboretum from a cross between Ilex serrata and the native Ilex verticillata, Apollo produces abundant small white flowers in early summer that provide pollen for compatible female hollies. Although it does not produce berries itself, its importance in the landscape comes from helping nearby female winterberries develop their characteristic colorful fruit.
Apollo develops into a large, upright, multi-stemmed shrub with attractive green foliage that turns yellow in fall before dropping for winter. The plant typically reaches approximately 10 to 12 feet tall and wide at maturity, giving it a substantial presence in the landscape. Its deciduous habit allows the branches to become more visible during winter, while its spring and summer foliage provides a green backdrop for flowering shrubs and other garden plants. New growth can have attractive burgundy-red coloration that adds additional seasonal interest.
This adaptable holly performs well in full sun to partial shade and can grow in a wide range of soil conditions, including moist clay, loam, sandy soils, and organic soils. It is particularly useful in areas with wet or periodically wet soil, where many other shrubs may perform poorly. Full sun encourages heavier flowering and provides the best conditions for producing abundant pollen. Once established, Apollo can tolerate a range of challenging landscape conditions, including wet soils, salt, and urban pollution.
Care Instructions:
Planting: Plant in full sun to partial shade in moist, well-drained soil. Choose a location with enough room for the shrub to reach its mature size.
Soil: Adaptable to clay, loam, sand, and organically rich soils. Performs particularly well in moist soils.
Watering: Provide consistent moisture during establishment and during extended periods of dry weather. Established plants tolerate a range of moisture conditions.
Fertilizing: Apply a balanced, slow-release fertilizer in early spring if soil conditions indicate additional nutrients are needed.
Pruning: Prune in late winter or early spring before new growth begins to remove damaged branches and maintain the desired shape.
Spacing: Allow approximately 10–12 feet between plants to accommodate the mature size and maintain good air circulation.
Maintenance: Maintain a layer of organic mulch over the root zone, remove damaged or crossing branches as needed, and plant near compatible female winterberries when pollen is needed for berry production.
Pollinator: Apollo is a male winterberry and does not produce berries. Plant it with compatible female varieties such as Sparkleberry, Winter Red, or Winter Gold for pollination and berry production.
Apollo is especially valuable when paired with female winterberry hollies that bloom at the same time. It was specifically selected as a male pollinator for Sparkleberry, and it can also be used with other compatible late-blooming female winterberries. Planting one male near several female plants allows the female shrubs to produce their colorful fall and winter berries. In a wildlife-focused landscape, pairing Apollo with female berry-producing hollies creates a more complete planting by providing both the pollination needed for fruit production and the eventual berries that provide food for birds.
Landscape Solutions:
- Provides an essential male pollinator for female winterberries where berry production is desired.
- Works particularly well with Sparkleberry, for which Apollo was specifically selected as a pollinator.
- Helps support berry production in late-blooming female winterberries such as Winter Red and Winter Gold.
- Provides a useful shrub for rain gardens, pond edges, and other moisture-retentive areas.
- Tolerates salt and urban pollution, making it useful in challenging landscape conditions.
- Adds seasonal interest with burgundy-red new growth, green summer foliage, yellow fall color, and an attractive multi-stemmed form.
- Provides pollen for bees and other pollinating insects during its flowering period.
