Smooth hydrangea 'Haas' Halo' (Hydrangea arborescens 'Haas' Halo') is a strong-stemmed, native selection prized for its oversized, lacecap-style white flower heads and handsome blue-green foliage. You get a shrub that looks refined up close, yet reads clearly from a distance in borders, woodland edges, and mixed foundation beds.

Expect a mature size around 36-60 inches tall, with a similar 36-60 inch spread. Blooms appear in summer on new growth, so you can enjoy reliable flowering even after cold winters. The large, airy lacecap structure also brings more visible texture than the classic mophead forms, and the blooms are useful fresh or dried.

Give your plant part shade to full sun. Morning sun with afternoon shade is ideal in warmer climates, but smooth hydrangea can take more sun if you keep the soil evenly moist. Plant in average, well-drained soil enriched with organic matter, and mulch to help conserve moisture and moderate soil temperatures. Water deeply during dry spells, especially in full sun.

For easy maintenance, prune in late winter to early spring before new growth begins. Because it flowers on new wood, you can cut back to shape and encourage sturdy, fresh stems for the season. Use it as a specimen, in masses, or as a native garden shrub that supports pollinators.

Specifications

• Cold hardiness zone: 3-9 (-40 degrees F) - Contact your local extension to confirm hardiness if you are in a fringe zone (we cannot guarantee hardiness in fringe zones)
• Light: Full sun   Part sun
• Mature height: 36-60"
• Spread: 36-60"
• Native to the U.S.: Yes

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