Black-Eyed Susan vs Lewis Mock Orange - TreeTime.ca

Black-Eyed Susan vs Lewis Mock Orange

Philadelphus lewisii

Rudbeckia hirta

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Lewis Mock Orange
Black-Eyed Susan

Lewis Mock Orange is a flowering ornamental shrub that produces an abundance of white, fragrant blooms. The flowers have a sweet scent similar to orange blossoms, with a hint of pineapple. They bloom for several weeks from late spring to early summer, attracting pollinators and other beneficial insects.

Native to North America, Lewis Mock Orange is found from the southernmost portions of Alberta and British Columbia, and south into the northwestern United States. It makes an attractive shrub and can be used in hedgerows, pollinator gardens, and naturalization projects. Blooms occur on the previous year’s wood, so it is recommended to prune after it has finished flowering.

Black-Eyed Susan is a striking native wildflower known for its bright yellow, daisy-like flowers with dark center disks. With deadheading, the plant can bloom for an extended period, from mid-summer to early fall. These cheerful flowers attract a variety of pollinators, including bees and butterflies. Adding to its ecological value, the plant also acts as a host for the Wavy-Lined Emerald Moth (Synchlora aerata) and the Silvery Checkerspot (Chlosyne nycteis) butterfly.

While it is typically a short-lived perennial or biennial, the plant freely self-seeds. This allows it to persist in the landscape, particularly in natural areas where it can spread and establish itself. This plant is drought-tolerant, salt-tolerant, and deer and rabbit-resistant, making it ideal for challenging environments. The Black-Eyed Susan is well suited to wildflower gardens, pollinator gardens, as well as slopes, banks, and naturalized areas.

Lewis Mock Orange Quick Facts

Black-Eyed Susan Quick Facts

Zone: 4a
Zone: 3a
Height: 3 m (10 ft)
Height: 0.8 m (2.5 ft)
Spread: 2.4 m (8 ft)
Spread: 0.5 m (1.5 ft)
Light: partial shade, full sun
Light: full sun
Moisture: dry, normal
Moisture: dry, normal
Growth rate: medium
Growth rate: very fast
Life span: medium
Life span: short
Growth form: upright to arching, multi-stemmed
Spreading: suckering - medium, seeds - low
Suckering: none
Maintenance: medium


Flowers: fragrant, white
Flowers: bright yellow; daisy-like
Bloom time: mid spring to early summer
Bloom time: early summer to fall
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: AB, BC
Native to: SK, MB, ON
Other Names: california mock orange, lewis mockorange, western mock orange, western syringa, wild mock orange
Other Names: hairy coneflower