Anise hyssop
Agastache foeniculum · Lamiaceae
📷 WayneRay · Public domain
The gardener's calendar
Anise hyssop is in full bloom: enjoy it, watch watering in hot weather and let spent flowers feed pollinators before pruning.
ID card
- Scientific name
- Agastache foeniculum
- Family
- Lamiaceae (mints)
- Type
- Perennial or annual herb depending on climate
- Mature height
- 70 to 90 cm
- Flowering
- June to September, violet-mauve flowers
- Foliage
- Deciduous, fragrant (anise-fennel)
- Hardiness
- Zone 4 to 9 (tolerates down to -30°C in continental climates)
- Origin
- North America
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Deadhead spent flowers regularly to extend blooming until the first frosts. Agastache tolerates drought well once established, but will flower more abundantly with regular watering during summer.
The common mistake
Overwatering in autumn and winter causes collar rot and kills the plant before winter even arrives.
The pro's trick
Sow seeds directly in place in spring: they germinate easily and you'll save money on buying plants.
Seasonal watch
In September, watch out for spider mites that yellow the leaves in hot, dry weather; a good misting often solves the problem.
Care
Exposure
Anise hyssop requires full sun for abundant flowering and optimal fragrance. It tolerates partial shade but becomes less compact and flowers less generously. Plant it in a well-ventilated spot to prevent stagnant moisture on the foliage.
Watering
Water moderately during growth, allowing the soil to dry slightly between waterings. Once established, the plant tolerates dry periods well thanks to its deep roots. Avoid excess moisture, which promotes winter rot.
Soil and planting
Plant in well-drained, light soil, ideally poor to moderate in organic matter. Anise hyssop prefers neutral to alkaline soils and tolerates sandy or stony soils. A moderate compost application at planting time is sufficient.
Pruning and maintenance
Deadhead regularly to extend flowering and stimulate new flower spikes. In late autumn or early spring, cut the plant back to 15-20 cm from the ground to maintain a bushy shape. Young leaves can be harvested as needed.
Fertilization
Fertilizer is generally unnecessary in proper soil. In pots or very poor soil, diluted balanced fertilizer once or twice in summer will suffice. Choose a formula rich in potassium to promote flowering.
Diseases and pests
Anise hyssop is hardy and rarely subject to disease. Watch for spider mites in very dry climates and powdery mildew in excessive humidity. Good drainage and air circulation prevent most problems.
Did you know?
Anise hyssop is a plant of the North American Great Plains grasslands, traditionally used by indigenous peoples to flavor foods and remedies. It attracts butterflies and bees abundantly, making it a valuable ally for pollinators; its sweet nectar and highly aromatic leaves (anise-fennel flavor) have made it popular with modern herbalists and eco-conscious gardeners.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
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Tips generated and checked by Viridia — adapt them to your local climate.