Anise hyssop
Agastache foeniculum
Also known asBlue giant hyssop · Lavender hyssop · Licorice mint
Environment
The bounded range this crop tolerates.
Climate and zones
- USDA zones
- 4–9 (winter low around -34°C)
- Frost
- frost hardy
- Season
- cool (spring/fall)
Growing systems
Root mass: moderate.
Growing media
| Medium | pH effect | Retention | Bacterial surface |
|---|---|---|---|
| Coco coir (Coconut coir) | slightly acidic | high | moderate |
| Perlite (Expanded volcanic glass) | neutral / inert | very low | low |
| Soil-based mix (Potting soil) | varies | high | high |
Nutrient demand by stage
NPK ratios are relative weights. EC targets shift through the plant's life.
| Stage | N | P | K | EC (mS/cm) |
|---|---|---|---|---|
| seedling | 2 | 1 | 1 | 0.8 |
| vegetative | 2 | 1 | 2 | 1.4 |
Aquaponics suitability
Compatible
Fish waste provides enough nitrogen for healthy growth. Supplemental potassium, calcium, and iron may still be needed depending on fish stocking density.
Care notes
A productive herb in hydroponic systems, especially valued for tea and as an edible flower. EC 1.2-2.0 mS/cm. pH 5.5-6.5. Temperature: 18–28°C (prefers moderate temperatures; handles cool conditions better than most herbs). Moderate to high light (DLI 15-22 mol/m2/day). The plants are vigorous and produce abundantly in DWC, drip, or NFT systems. Harvest leaves regularly by cutting stem tips, which promotes bushy branching. The lavender flower spikes are edible and make an attractive garnish. For tea, dry leaves in a dehydrator at 35–40°C to preserve the volatile oils. Growth is fast; plants reach harvestable size 6-8 weeks from transplant. The plants are perennial and can be maintained in a hydroponic system for 2-3 years, though production declines after the second year. Divide and replant if the root mass becomes too large for the system. Pest issues are minimal. Anise hyssop pairs well with other hydroponic herbs (basil, mint, lemon balm) for a tea garden section in a greenhouse system. The flavor is distinctly different from true anise or fennel: sweeter, more floral, with mint undertones that make it refreshing in cold drinks and desserts. Fresh leaves steeped in hot water produce one of the best herbal teas available from a home garden. The dried flowers retain their color and can be used as a natural food decoration. Anise hyssop is self-seeding in outdoor gardens and can become somewhat invasive; in hydroponic systems, this is not a concern.