Sulphur-Flower Buckwheat vs Anise Hyssop - TreeTime.ca

Sulphur-Flower Buckwheat vs Anise Hyssop

Agastache foeniculum

Eriogonum umbellatum

CUSTOM GROW

Anise Hyssop
Sulphur-Flower Buckwheat

Anise Hyssop is a native perennial wildflower known for its fragrant spikes of small purple flowers. This plant is an excellent source of nectar and is highly attractive to a variety of bees and other pollinators. Deadheading spent flowers will encourage more blooms throughout the season.

Its aromatic leaves release an anise-like (licorice) scent when crushed. Both the leaves and seeds are edible and have been used in teas and as flavouring. Leaves can be harvested at any time, though the oil content is highest just past full bloom. Deer tend to avoid Anise Hyssop because of its strong-smelling leaves. This makes it a useful plant for positioning as a protective border around more vulnerable species.

Anise Hyssop spreads by seeds and rhizomes, but is less aggressive than other members of the mint family and is easy to remove if needed. Historically, it was planted in large numbers as a honey plant to support apiaries. Birds also feed on its seeds, adding to its ecological value.

Sulphur-Flower Buckwheat is a native perennial wildflower known for its dense clusters of cream to yellow flowers. The long-lasting blooms persist from late spring into summer, providing an extended nectar source for a variety of pollinators. The flower buds are often red-tinted before opening. As the blooms age, they shift to orange or red, adding seasonal interest and making them well-suited to dried flower arrangements. Its seeds are also eaten by birds, adding to its ecological value.

Depending on climate and conditions, Sulphur-Flower Buckwheat may be evergreen to semi-evergreen, or its foliage may turn red during fall. Its deep roots and spreading growth stabilize rocky or sandy soils, making it useful for erosion control. Exceptionally hardy once established, it requires little care and thrives in challenging environments, making it an excellent choice for pollinator gardens, naturalization, and ecological restoration projects.

Anise Hyssop Quick Facts

Sulphur-Flower Buckwheat Quick Facts

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Zone: 3b
Zone: 3a
Height: 0.9 m (3 ft)
Height: 0.2 m (0.5 ft)
Spread: 0.6 m (2.0 ft)
Spread: 0.5 m (1.5 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: dry, normal
Moisture: dry, normal
Growth rate: fast
Growth rate: medium
Life span: short
Life span: short
Growth form: upright, clump-forming
Growth form: upright to spreading, clump-forming
Spreading: seeds - high, rhizomes - medium
Spreading: seeds - low
Maintenance: medium


Foliage: aromatic when crushed
Foliage: leathery
Fall colour: reddish bronze
Flowers: spikes of purple flowers
Flowers: colour varies, typically white to yellow
Bloom time: summer to fall
Bloom time: mid spring to mid summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: AB, SK, MB, ON, NT
Native to: AB, BC
Other Names: blue giant hyssop, giant hyssop, lavender hyssop
Other Names: sulphur buckwheat, sulphur flower, wild buckwheat