Haas' Halo Smooth Hydrangea

Haas' Halo Smooth Hydrangea (Hydrangea arborescens 'Haas' Halo')

Haas' Halo Smooth Hydrangea is a robust lacecap selection famed for oversized, dinner-plate blooms with a wide halo of showy sterile florets around a nectar-rich center; strong stems, handsome green foliage, and reliable flowering make a standout shrub for borders, woodland edges, and foundation plantings.

Distinctive Features

Gigantic lacecap heads on sturdy stems resist flopping, while fertile centers draw pollinators and the floral display ages gracefully from creamy white to soft parchment tones.

Growing Conditions

Plant in fertile, moisture-retentive but well-drained soil; provide morning sun with afternoon shade or bright dappled light, and increase irrigation for full-sun sites.

• Sun Exposure: Full sun to partial shade; best with morning sun and afternoon shade in hotter regions.
• Soil: Loamy, well-drained soil enriched with organic matter; tolerates clay if not waterlogged.
• Water: Moderate and regular; keep evenly moist, especially in summer heat.
• USDA Hardiness Zones: 3 to 9.
• Mature Size: Typically 4 to 6 ft tall and 4 to 6 ft wide.
• Bloom Time: Early to midsummer on new wood, with heads persisting into fall.
• Soil pH: Slightly acidic to neutral, about 5.5 to 7.0; pH does not change bloom color.

Ideal Uses

Use as a pollinator-friendly specimen, repeat in drifts for seasonal drama, or mix with fine-textured perennials and evergreens to contrast the large, flat-topped blooms.

• Focal Point: Oversized lacecaps and sturdy carriage anchor part-sun beds.
• Pollinator Gardens: Fertile centers feed bees and butterflies.
• Mixed Borders: Partners well with ferns, hosta, and ornamental grasses.
• Hedges and Screens: Dense habit forms an attractive seasonal barrier.
• Cut Flowers: Excellent for fresh arrangements and drying.

Low Maintenance Care

Simple late-winter pruning and steady moisture keep plants vigorous and floriferous with minimal effort.

• Watering: Deeply soak during establishment; irrigate in drought to prevent stress.
• Pruning: Blooms on new wood; cut back by one third to one half in late winter to encourage strong stems and large heads.
• Fertilizing: Apply compost or a balanced, slow-release fertilizer in spring; avoid heavy late-season feeding.
• Mulching: 2 to 3 in organic mulch to conserve moisture and moderate soil temperature.
• Notes: Good disease resistance; ensure airflow to limit leaf spot and remove old heads and damaged wood after frost.

Why Choose Haas' Halo Smooth Hydrangea?

This cultivar combines exceptional flower size, pollinator value, and sturdy architecture for dependable, high-impact performance.

• Monumental Lacecaps: Dramatic halo blooms on strong stems.
• Pollinator Friendly: Fertile centers provide abundant nectar.
• Reliable Rebloom: Flowers on new wood after winter pruning.
• Shade Tolerant: Thrives in part shade where many shrubs struggle.
• Low Upkeep: Minimal pruning and routine moisture deliver top results.

Site in morning sun with afternoon shade, amend with compost, and prune in late winter to showcase its massive halo blooms and sturdy, landscape-ready form.