Haas Halo smooth hydrangrea

Haas Halo Smooth Hydrangea

Scientific Name
Hydrangea arborescens ‘Haas Halo’
Endangered Status
Number of Recorded Individuals at the Zoo

Haas Halo smooth hydrangea, a selection of the species native to Illinois, has dense, upright blue-green foliage and white lace cap flowers that grow up to 14 inches in width. The flowers bloom in mid to late summer and dry out in the fall and persist on the stems, which provide cover for wildlife, until spring. This shrub cultivar prefers average, well-drained soil in full sun or partial shade and can be effective as a single specimen plant or in a large group. Due to its abundance of small, fuzzy, fertile flowers, this hydrangea is a favorite for bees and other pollinators.

Native Range
From cultivation; species native to eastern United States
USDA Hardiness Zone
Average Mature Height
4 feet
Flower Color
White and green
Flowering Months
Bees and small mammals

Second Saturday Garden Tours

Join fellow nature lovers for a free, guided tour of Lincoln Park Zoo’s diverse plant life and ecosystems. During each tour, a zoo horticulturist will point out interesting species in bloom, answer questions from guests, and discuss the horticulture program’s past, present, and future.

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Closeup of leaves on a tree

An Accredited Arboretum

In 2019, Lincoln Park Zoo earned Level II arboretum accreditation in recognition of the Horticulture staff’s ongoing effort to identify, label, and monitor the more than 330 species of trees, shrubs, and woody plants represented across the 49-acre park.

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