Plant Care Agastache Foeniculum

Agastache Foeniculum

Also known as

Anise-Hyssop, Anise-Hyssop, Blue giant hyssop, Agastache anethiodora, Anise hyssop, Fragrant giant hyssop and Lavender giant hyssop


Agastache foeniculum

How to care for Agastache Foeniculum

💦 Water

How often to water your Agastache Foeniculum

Water needs for Agastache Foeniculum
0.5 cups
every 9

Agastache Foeniculum needs 0.5 cups of water every 9 when it doesn’t get direct sunlight and is potted in a 5" pot.

Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Calculate water needs of Agastache Foeniculum

Water 0.5 cups every

Does your plant get direct sunlight?

Select the pot size

☀️ Light

Finding light for Anise-Hyssop in your home

Light needs and placement for plant Agastache Foeniculum: 1ft from a window
1ft or less from
a window

Agastache Foeniculum love being close to bright, sunny windows 😎.

Place it less than 1ft from a south-facing window to maximize the potential for growth.

Agastache Foeniculum does not tolerate low-light 🚫.

Select your region to see how the current weather in your area affects the placement of Agastache Foeniculum in your home 🏡.

🪴 Nutrients

How to fertilize Agastache Foeniculum

Nutrient, fertilizer, and repotting needs for Agastache Foeniculum: repot after 2X growth

Most potting soils come with ample nutrients which plants use to produce new growth.

By the time your plant has depleted the nutrients in its soil it’s likely grown enough to need a larger pot anyway.

To replenish this plant's nutrients, repot your Agastache Foeniculum after it doubles in size or once a year—whichever comes first.

Browse #BlueGiantHyssop
💡 FAQs
⭐ Difficulty Level

Agastache Foeniculum is generally considered an easy-to-care-for plant and makes a great choice for beginners!

Benefits of Growing Anise-Hyssop →

Common Anise-Hyssop Problems →

💦 Water Needs

Agastache Foeniculum prefers for the soil to dry out between waterings and should be watered regularly. Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Anise-Hyssop Water Frequency →

Anise-Hyssop Root Rot →

☀️ Sunlight Needs

Agastache Foeniculum requires abundant, bright and direct light. Place it less than one foot from a window to ensure it receives enough light to survive 💪. Select your region to see how the current weather in your area affects the placement in your home 🏡.

Anise-Hyssop Light Requirements →

Anise-Hyssop Direct Sunlight Needs & Tolerance →

🐶 🐈 👶 Toxicity

Greg does not have confirmed data on this plant’s toxicity. If you, a family member, or a pet consumes plant material of unknown toxicity, it’s always best to consult a medical professional.

If you or someone else ingested this plant, call Poison Control at US (800) 222-1222. If a pet consumed this plant, contact your veterinarian or the ASPCA at US (888) 426-4435.

🪴 Soil

Agastache Foeniculum does best in well-draining soil. A good soil will contain lots of organic matter such as coco coir as well as perlite or vermiculite to help with drainage. Adding a handful of perlite to regular store-bought potting soil should do the trick!

Best Soil Mix for Anise-Hyssop →

When and How to Successfully Repot Anise-Hyssop →

💩 Fertilizer

Agastache Foeniculum should be repotted after it doubles in size or once a year, whichever comes first. Fresh potting soil has all the nutrients your plant needs, so as long as it’s refreshed yearly, you shouldn’t need to use fertilizer. Remember, plants get their energy from sunlight, not fertilizer!

How Much and When to Fertilize Anise-Hyssop →

⬆️ ⬇️ Growth Pattern

Agastache Foeniculum grows vertically and new growth will emerge from the top of the plant.

🌦️ Growing Outdoors

USDA Hardiness Zone
Agastache Foeniculum can be grown outdoors in USDA Hardiness Zones 5a-9b. Find your local hardiness zone here.

Anise-Hyssop Temperature Tolerance →

🌱 Propagation

Agastache Foeniculum can be propagated by division into new individual plants.

  • Check to see if there is more than one plant. In some cases they may still be beneath the soil surface. If you feel confident, you may remove the soil to check for baby plantlets below!
  • If there are multiple plants growing, unpot the plant and gently tug the plants apart, being careful not to disturb too many of the roots. They may be connected by large root segments which you may need to break to free the plantlet.
  • Pot up the new plant in well-draining soil
  • Repot the parent plant back into its original pot

🧐 Troubleshooting

When troubleshooting a sad-looking houseplant, start by checking for signs of distress in its leaves, such as yellowing, browning, or drooping, which can indicate overwatering or nutrient deficiencies.

Inspect the soil moisture; too dry or too wet soil can cause problems.

Ensure the plant is getting the right amount of light, as too much or too little can stress it.

Finally, consider environmental factors like temperature and humidity, and adjust care routines accordingly to revive your plant.

Care Summary for Agastache Foeniculum

Agastache Foeniculum

Agastache Foeniculum

Greg recommends:


0.5 cups every 9 days


< 1ft from a window


Repot after 2x growth

Based on the 4” pot your plant is in, and that it doesn’t get direct sunlight.

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