Black-Eyed Susan vs Nodding Onion - TreeTime.ca

Black-Eyed Susan vs Nodding Onion

Rudbeckia hirta

Allium cernuum

NOT AVAILABLE THIS SEASON - MIGHT RETURN

NOT AVAILABLE THIS SEASON - MIGHT RETURN

Black-Eyed Susan
Nodding Onion

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

As a perennial, it dies back to the crown each winter, it will regrow from the base in the spring. Avoid disturbing the crown during late winter to ensure healthy growth the following season.

Nodding Onion is a native perennial wildflower known for its nodding clusters of flowers that range in color from white to pink to purple. The lightly scented blooms provide pollen and nectar for pollinators, especially bees, which can collect while hanging upside down, a capability most other insects lack.

The narrow, grass-like leaves of the Nodding Onion can be used as a seasoning in cooked dishes, though bulbs and raw leaves should not be eaten in large quantities. All parts of the plant have an onion-like aroma when bruised, which helps deter deer and rabbits. They can self-seed readily, so removing spent blooms helps manage their spread. Tolerant of a range of soils, including alkaline, it is well-suited for a variety of plantings, including pollinator gardens and naturalization projects.

Black-Eyed Susan Quick Facts

Nodding Onion Quick Facts

Zone: 3a
Zone: 3a
Height: 0.8 m (2.5 ft)
Height: 0.3 m (1.0 ft)
Spread: 0.5 m (1.5 ft)
Spread: 0.2 m (0.5 ft)
Light: full sun
Light: partial shade, full sun
Moisture: dry, normal
Moisture: dry, normal
Growth rate: very fast
Growth rate: fast
Life span: short
Life span: short
Growth form: upright to spreading, clump-forming
Spreading: seeds - high
Suckering: none
Maintenance: medium
Maintenance: medium


Toxicity: raw leaves and bulbs can be midly toxic
Foliage: smells of onion when crushed, edible
Flowers: bright yellow; daisy-like
Flowers: white, pink, or purple nodding clusters
Bloom time: early summer to fall
Bloom time: late spring to summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: SK, MB, ON
Native to: AB, BC, SK, ON
Other Names: hairy coneflower
Other Names: ladys leek, nodding wild onion