The Incrediball Hydrangea, Hydrangea arborescens ‘Abetwo’, sold under the trade name Incrediball®, is a supercharged evolution of the classic Annabelle Hydrangea that was introduced to the gardening world around 2010 by Spring Meadow Nursery. Developed specifically to address the one significant weakness of the beloved ‘Annabelle’ — its tendency to flop under the weight of its enormous blooms — Incrediball delivers everything that made Annabelle famous, but on stronger, more upright stems that hold their heads with considerably greater dignity. From the moment of its release, it was embraced enthusiastically by gardeners and landscapers who had long admired Annabelle but grown weary of staking its drooping branches.
The flowers of Incrediball are, as the name boldly promises, truly incredible in their scale. The perfectly rounded, snowball-like flower heads can reach an astonishing 12 inches or more in diameter, making them among the largest blooms of any hydrangea in cultivation. Like ‘Annabelle’, the flowers open from lime green buds, transition to brilliant pure white at peak bloom, and age gracefully to a soft parchment and finally a warm tan as the season advances. Each stage of this color journey has its own quiet elegance, and the dried flower heads that persist into winter add skeletal beauty to the dormant garden.
One of Incrediball’s most valuable qualities is its exceptional cold hardiness, a trait inherited from its Hydrangea arborescens parentage. It is reliably hardy to USDA zone 3, making it one of the toughest flowering shrubs available to gardeners in the coldest regions of North America and comparable climates elsewhere. Crucially, like ‘Annabelle’, it blooms on new wood produced each spring, meaning late frosts, harsh winters, and even complete dieback of the stems pose no lasting threat to its flowering performance. This reliability makes it a plant that gardeners in challenging climates can depend upon absolutely.
Incrediball is a vigorous and substantial shrub, typically maturing to 4 to 5 feet in both height and spread, with a rounded, mounding habit that fits naturally into a wide range of garden styles. Its strong, thick stems — noticeably more robust than those of ‘Annabelle’ — support the massive flower heads without the chronic flopping that frustrated so many gardeners with its predecessor. The foliage is broad, deep green, and lush, providing an attractive and substantial backdrop for the spectacular white blooms throughout the growing season.
Cultivation of Incrediball is straightforward and rewarding. It thrives in moist, well-drained, organically rich soil and performs well in partial shade, though it can tolerate more sun in cooler climates when given adequate moisture. Pruning is simple and hard to get wrong — stems can be cut back to about 12 to 18 inches from the ground in late winter or early spring, stimulating vigorous new growth and the production of the largest and most impressive flower heads. A generous layer of mulch around the base helps retain soil moisture, suppress weeds, and protect the root system during cold winters, contributing to the plant’s long-term health and vigor.
Incrediball has proven itself not merely as an improvement on a classic, but as a landmark cultivar in its own right, earning widespread recognition including the prestigious Gold Medal from the Pennsylvania Horticultural Society. Its success encouraged further innovation within the arborescens group, most notably inspiring the development of the Invincibelle® series, which introduced pink, rose, and ruby tones previously unseen in the species. Together, these cultivars have transformed Hydrangea arborescens from a genus known primarily for a single white-flowered classic into a diverse and exciting group offering gardeners a genuinely broad palette of colors, sizes, and forms to explore and enjoy.
Landscaping uses of Incrediball Hydrangea
- Mass Planting for Bold Impact
Incrediball hydrangea is often used in mass plantings to create a dramatic floral display. When planted in groups, its oversized white blooms form a striking summer feature that fills large garden spaces with uniform color and texture. - Foundation Planting
It is commonly used around homes and buildings to soften structural lines. Its strong stems and large flowers provide a clean, elegant look that enhances exterior architecture without appearing overly formal. - Mixed Shrub Borders
Incrediball fits well into mixed shrub and perennial borders where seasonal variety is desired. Its large blooms contrast beautifully with finer-textured plants, helping create layered and balanced garden compositions. - Informal Hedges or Edging Screens
When planted in rows, it can form a loose flowering hedge or soft screen. While not dense like traditional hedges, it provides seasonal privacy and a strong ornamental boundary during blooming periods. - Cut Flower and Display Gardens
This hydrangea is widely used in cutting gardens due to its sturdy stems and long-lasting blooms. The large flower heads are ideal for fresh arrangements and dried floral displays, adding value beyond the landscape.
Cultivation of Incrediball Hydrangea
- Climate Suitability
Incrediball hydrangea is highly cold-hardy and thrives in temperate regions with distinct seasons. It performs reliably even after harsh winters because it blooms on new wood. - Light Requirements
It grows best in partial shade but can tolerate full sun in cooler climates. In hotter regions, afternoon shade helps prevent wilting and stress on the large flower heads. - Soil Conditions
The plant prefers rich, well-drained soil with plenty of organic matter. It adapts to a range of soil types but performs best in slightly acidic to neutral conditions. - Watering Needs
Consistent moisture is essential, especially during establishment and flowering. The soil should be kept evenly moist, as drought stress can reduce bloom size and plant vigor. - Mulching Practices
Organic mulch helps retain soil moisture, regulate temperature, and reduce weed competition. It also improves soil fertility as it decomposes over time. - Fertilization Strategy
A balanced fertilizer applied in early spring encourages strong growth and massive flower heads. Excess nitrogen should be avoided, as it can lead to weak stems and fewer blooms. - Pruning Requirements
Incrediball blooms on new wood, so it should be cut back hard in late winter or early spring. This pruning encourages strong new shoots that support its oversized flower clusters. - Support for Flower Heads
The plant produces very large, heavy blooms that may bend stems. Strong stems are a natural feature of this cultivar, but light staking or spacing can help maintain an upright appearance. - Propagation Methods
Propagation is typically done through softwood or hardwood cuttings. These root easily under moist, warm conditions with well-prepared propagation media. - Pest and Disease Management
It is generally resistant but may occasionally experience aphids or powdery mildew. Good airflow and proper spacing help reduce disease problems significantly. - Container Growing
It can be grown in large containers with proper drainage. Container-grown plants require more frequent watering and feeding due to faster soil drying. - Seasonal Maintenance
Cutting back in late winter ensures vigorous spring regrowth. Winter mulching helps protect the root zone in colder climates. - Landscape Value
Incrediball hydrangea is prized for its massive, long-lasting white blooms and strong stems. It is a low-maintenance plant that provides bold impact in gardens, borders, and mass plantings.