Wild hydrangea ‘Haas’ Halo’ is a woody, deciduous, perennial shrub cultivar in the Hydrangeaceae (hydrangea) family with a mounding habit lace-cap flowers and a rapid growth rate. At maturity it will be 4 to 6 feet tall and 3 to 5 feet wide. The parent plant is native to North America. The name hydrangea is derived from Greek and Latin and taken to mean water vessel, in reference to the "cup-like form of the seed-capsule." Provide this shrub with moist to occasionally dry soil and while it withstands partial or deep shade, the best flowering will occur in full sun. 'Haas Halo' withstands heat and humidity better than other smooth hydrangeas as long as it has plenty of water. It tolerates various soil textures as long as they have a neutral to acidic pH. Prune the shrub back in the spring to encourage a larger flower display. Note that the flowers will appear on new growth. This hydrangea features very large, lace-cap blooms from June through July. The flowers attract bees and butterflies. The foliage is a deep blue-green, and the stout stems will not droop after a hard rain. Dried flower heads provide winter interest. Plant it in mass in a woodland, pollinator, or winter garden. Use in a shrub border or as an accent or specimen or planted near a lawn or plant it in a cutting garden. Insects, Diseases, and Other Plant Problems: No significant problems. VIDEO Created by Elizabeth Meyer for "Trees, Shrubs and Conifers," a plant identification course developed in partnership with Longwood Gardens. More information on Hydrangea arborescens .
Curated pairwise relationships between this plant and others in the library — who feeds
whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.
No curated interactions recorded for this species yet.
Also noted by NC State
Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell
apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.
Deep shade (Less than 2 hours to no direct sunlight) | Full sun (6 or more hours of direct sunlight a day) | Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Soil texture
Clay; High Organic Matter; Loam (Silt); Sand
Soil pH
Acid (<6.0); Neutral (6.0-8.0)
Soil drainage
Moist | Occasionally Dry
Available space
3 feet-6 feet
NC region
Coastal; Mountains; Piedmont
Mature size
Height: 4 ft. 0 in. - 6 ft. 0 in. | Width: 3 ft. 0 in. - 5 ft. 0 in.
Growth rate
Rapid
Canopy layer
4 - Herbaceous (3-15 ft)
Form & Appearance
Habit / form
Mounding
Texture
Coarse
Foliage
Deciduous
Leaf color
Blue; Green
Leaf type
Simple
Leaf shape
Cordate; Ovate
Leaf margin
Serrate
Leaf feel
Leathery; Smooth
Leaf size
3-6 inches long, 3-6 inches wide
Hairs present
No
Leaf detail
Leathery leaves may appear deep bluish-green. They are 3-6 inches long with toothed margins, rounded base and pointed tip.
Flower color
White
Flower value
Good Dried; Showy
Flower form
Corymb; Head
Flower detail
Lace-cap flowers are up to 8 inches across. Outer showy white florets are sterile while the small greenish inner florets are fertile. Dried flower heads provide late-season interest. Blooms from mid June through early July.