Yellow Giant Hyssop

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Description

Yellow giant hyssop (Agastache nepetoides) is a tall, herbaceous perennial plant native to the central and eastern United States and Canada. It is a member of the mint family (Lamiaceae), and is closely related to lavender and sage.

Yellow giant hyssop is a stunning plant that can reach up to 6 feet tall, with long, narrow leaves and spikes of pale-yellow flowers. The flowers bloom from mid-summer to fall, and they are a magnet for bees, butterflies, and other pollinators.

Yellow giant hyssop is a versatile plant that can be used in a variety of ways. It can be planted in the back of a border, where it will provide a dramatic backdrop for other flowers. It can also be used to create a hedge or screen. And, because it is deer-resistant, it is a good choice for plantings in areas where deer are a problem.

Yellow giant hyssop is relatively easy to care for. It prefers full sun to part shade, and well-drained soil. It is drought-tolerant once it is established, but it will benefit from occasional watering during hot, dry spells.

If you are looking for a tall, showy perennial plant that is easy to care for, yellow giant hyssop is a great choice. It is a beautiful plant that will add interest to your garden for many years to come.

Here are some of the things to keep in mind when growing yellow giant hyssop:

    • It is a long-lived plant, so you can expect it to come back year after year.
    • It is relatively easy to care for, but it does need well-drained soil.
    • It is drought-tolerant once it is established, but it will benefit from occasional watering during hot, dry spells.
  • It is deer-resistant, so it is a good choice for plantings in areas where deer are a problem.
Yellow Giant Hyssop
Planting Instructions

Planting Instructions for Agastache nepetoides

Scientific Name: Agastache nepetoides
Common Name: Yellow Giant Hyssop

1. Site Selection:
Sunlight: Full sun to part shade (6+ hours of direct sunlight daily) is ideal.  
Soil: Well-drained soil is essential. Avoid heavy clay soils that retain moisture.  
Space: Allow 18-24 inches between plants for adequate air circulation.
2. Direct Sowing Outdoors:
Fall Sowing:
Time: Sow seeds directly into the garden in the fall after the first frost.  
Method:
Prepare the soil by removing weeds and loosening the top few inches.  
Sow seeds lightly on the surface of the soil.  
Gently press the seeds into the soil.  
Water gently and keep the soil consistently moist throughout the winter.
Stratification: Fall sowing provides natural cold stratification over winter, which is essential for germination.  
Spring Sowing:
Time: Sow seeds directly into the garden after the last frost has passed.
Method:
Follow the same soil preparation as for fall sowing.
Sow seeds lightly and press them into the soil.
Water gently and keep the soil consistently moist until germination.  
3. Starting Seeds Indoors:
Time: Start seeds indoors 6-8 weeks before the last expected frost.  
Method:
Stratification:
Place seeds between moist paper towels in a sealed plastic bag.
Refrigerate for 4-6 weeks for cold stratification.
Planting:
Fill seed trays or pots with a well-draining seed-starting mix.
Sow seeds lightly on the surface of the soil.  
Gently press the seeds into the soil.  
Water gently and keep the soil consistently moist.
Place trays in a warm, bright location with temperatures around 70-75°F (21-24°C).
Transplanting:
Once seedlings have developed 2-3 true leaves, harden them off gradually by exposing them to increasing periods of outdoor conditions.
Transplant seedlings into the garden after the last frost has passed, spacing them 18-24 inches apart.
4. Watering:
Water seedlings regularly to keep the soil consistently moist but not waterlogged.
Once established, Agastache nepetoides is relatively drought-tolerant, but water deeply during extended dry periods.  
5. Maintenance:
Deadheading: Remove spent flower spikes to encourage continuous blooming.
Pruning: Cut back plants in late winter or early spring to encourage new growth.  
Mulching: Apply a layer of organic mulch around the base of the plants to help retain moisture and suppress weeds.
6. Invasive Potential:
Agastache nepetoides is generally not considered invasive in the USA.
Important Notes:
Scarification: Scarification is not typically necessary for Agastache nepetoides seeds.
Soil Preparation: Amend heavy clay soils with compost or sand to improve drainage.  
By following these guidelines, you can successfully grow Agastache nepetoides in your garden and enjoy its beautiful blooms and attract a variety of pollinators.

Agastache nepetoides
Yellow Giant Hyssop

Native Plant Map

Dark Green indicates the plant is native within the state, yellow rare, the lime green indicates where the plant is native and seen more within a state.

Map Credits BONAP©2024

Testimonials

★★★★★

I love Native Sunflowers in my home garden and landscape.

Mary Hoggins
Tyler, Texas
★★★★★

Last year in the Fall, I collected a lot of seeds I planted this year.

Roger Holmes
Dallas, Texas
★★★★★

They really added a big splash of color to the front of my house garden bed. Love them!

Audrey Long
Mobile, Alabama

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