Agastache ‘Blue Fortune’ (Giant Hyssop)

Plant: Table of Contents

Agastache ‘Blue Fortune’ (Giant Hyssop): A Masterpiece in the Garden

Agastache ‘Blue Fortune’, also known as Giant Hyssop, is a stunning perennial herb that belongs to the mint family, Lamiaceae. This plant is widely appreciated for its elaborate flower spikes and its ability to attract various pollinators to the garden. Its delightful fragrance, vibrantly colored blooms, and resilience make it a popular choice for gardeners looking to add exuberance to their landscape. In this comprehensive guide, we will delve into the various aspects of caring for and cultivating Agastache ‘Blue Fortune’, sharing essential tips and insights for its successful growth and maintenance.

What is Agastache ‘Blue Fortune’ (Giant Hyssop)?

Agastache ‘Blue Fortune’ is a species of perennial plant that is native to North America and is renowned for its striking, densely packed flower spikes that adorn the plant throughout the summer and fall seasons. With its aromatic foliage and attractive blooms, it is highly sought after for its ornamental value. Additionally, it provides valuable resources for pollinators, making it a beneficial addition to any wildlife-friendly garden.

Key Takeaways

Before delving into the specifics of caring for Agastache ‘Blue Fortune’, it is vital to understand the plant’s fundamental requirements and characteristics. Here are some key takeaways that will set the stage for a successful cultivation experience:


  • Agastache ‘Blue Fortune’ is a perennial herbaceous plant, which means it regrows after its dormancy period and continues to thrive for multiple years.
  • In terms of size, it typically reaches a height and spread of 2 to 4 feet, making it a substantial presence in the garden.
  • The plant is characterized by its attractive, lance-shaped green leaves.
  • Its flowering period extends from mid to late summer, continuing into the fall, adding a burst of color to the garden during the latter part of the growing season.


  • Giant Hyssop is primarily cultivated for its ornamental value due to the captivating spires of vibrant blooms that adorn the plant.
  • It is also valued for its ability to attract pollinators such as bees, butterflies, and hummingbirds to the garden, contributing to the overall ecological balance.

Now that we have gained a preliminary understanding of Agastache ‘Blue Fortune’, let’s explore the essential care guidelines for cultivating and maintaining this stunning plant.


Proper watering is crucial for the health and vigor of Agastache ‘Blue Fortune’. While this plant is known for its drought tolerance once established, consistent moisture is essential, particularly during the initial stages of growth. Ensuring that the soil is well-drained is imperative to prevent waterlogging, which can lead to root rot and other detrimental conditions.

Watering Requirements:

  • Establishment Phase: During the initial stages of growth, it is essential to maintain slightly moist soil to facilitate the development of a robust root system. Ensure that the plant receives approximately 1 inch of water per week, either through rainfall or manual irrigation.
  • Mature Plants: Once established, Giant Hyssop demonstrates remarkable tolerance to dry conditions. However, during prolonged dry spells, providing supplemental water can help maintain the plant’s vitality and enhance its flowering performance.


Agastache ‘Blue Fortune’ thrives in full sun, exhibiting the best growth and flowering performance when exposed to at least 6 to 8 hours of direct sunlight each day. Proper sunlight exposure is essential for promoting flowering, intensifying the coloration of the blooms, and ensuring the overall vigor of the plant.

Sunlight Exposure:

  • Optimal Conditions: Plant Agastache ‘Blue Fortune’ in a location that receives abundant sunlight to maximize its growth and blooming potential. Full sun exposure facilitates the production of vibrant flower spikes and promotes the plant’s overall vitality.
  • Shade Tolerance: While the plant prefers full sun, it can tolerate partial shade, particularly in regions with intense daytime heat. However, to ensure the best results, partial shade conditions should be provided with caution, as excessive shading can compromise the plant’s flowering and overall appearance.


Maintaining proper nutrition is integral to the healthy growth and blooming of Agastache ‘Blue Fortune’. Applying a balanced fertilizer during the growing season provides the necessary nutrients to support robust foliage development and prolific flowering.

Fertilization Guidelines:

  • Fertilizer Type: Utilize a balanced, all-purpose fertilizer or a formulation specifically designed for flowering perennials to meet the nutritional requirements of Agastache ‘Blue Fortune’.
  • Application Timing: Apply fertilizer in early spring as new growth emerges, ensuring that the nutrients are readily available as the plant embarks on its active growth phase. Additionally, a light application of fertilizer in midsummer can further support the plant’s vigor and flowering capacity.

Now that we have discussed the fundamental care requirements related to water, sunlight, and fertilizer, let’s move on to explore the critical aspects of soil, pruning, propagation, and container gardening for Agastache ‘Blue Fortune’.


The selection of the appropriate soil type is pivotal in facilitating the healthy establishment and growth of Agastache ‘Blue Fortune’. Well-drained, fertile soil with a slightly acidic to neutral pH range provides an ideal growing medium for this resilient perennial.

Soil Preferences:

  • Drainage: Opt for well-draining soil to prevent waterlogging, which can compromise the root health of the plant. Amending heavy or compacted soil with organic matter can substantially improve its drainage capabilities.
  • pH Range: Giant Hyssop thrives in soil with a pH range of 6.5 to 7.5. Conducting a soil test can provide valuable insights into the soil’s pH, enabling necessary adjustments to create an optimal growing environment for the plant.


Pruning plays a crucial role in enhancing the overall appearance and longevity of Agastache ‘Blue Fortune’. Proper pruning practices promote a tidy growth habit, stimulate continuous flowering, and contribute to the plant’s overall health.

Pruning Guidelines:

  • Deadheading: Regularly remove spent flowers to encourage the production of new blooms and prolong the flowering period of the plant. Deadheading also prevents the formation of seeds, directing the plant’s energy towards vegetative growth and flower production.
  • Thinning: In early spring, undertake pruning to thin out any crowded or weak growth, allowing for improved air circulation and light penetration, which can help prevent disease and promote vigorous growth.


Agastache ‘Blue Fortune’ can be propagated through various methods, including seed sowing and division. Understanding the appropriate propagation techniques is essential for expanding your plant collection and ensuring the continual presence of Giant Hyssop in your garden.

Propagation Methods:

  • Seed Sowing: Sow Agastache ‘Blue Fortune’ seeds indoors in early spring, providing the seeds with consistent moisture and warmth to facilitate germination. Following the last frost date, the seedlings can be transplanted into the garden, where they will establish and thrive.
  • Division: Divide mature plants in early spring or fall, ensuring that each division possesses adequate roots and shoots. Replant the divisions in prepared soil, providing them with sufficient moisture to aid in their establishment.

Container Popularity

Agastache ‘Blue Fortune’ is popularly grown in containers, offering an excellent option for gardeners with limited space or those interested in creating vibrant, portable displays of flowers and foliage. The striking appearance and compact growth habit of Giant Hyssop make it well-suited for container cultivation, enabling its integration into diverse garden settings.

Container Gardening Considerations:

  • Container Selection: Choose a well-draining container with adequate drainage holes to prevent waterlogging. The container size should accommodate the mature growth of the plant, providing sufficient space for its root system to thrive.
  • Soil Medium: Utilize a high-quality, well-aerated potting mix that promotes excellent drainage, root health, and overall plant vigor. Additionally, incorporating a slow-release fertilizer into the potting mix can sustain the plant’s nutritional needs over an extended period.

Now that we have explored the fundamental aspects of caring for Agastache ‘Blue Fortune’, including water, sunlight, fertilizer, soil, pruning, and propagation, let’s delve into the common diseases, pests, and valuable tips from botanists for cultivating and maintaining this captivating perennial.

Common Diseases

While Agastache ‘Blue Fortune’ is relatively resilient and resistant to many diseases, it can occasionally encounter certain issues that are important for gardeners to be aware of. Early identification and intervention are key in mitigating the impact of potential diseases on the health and vigor of the plant.

Disease Diagnosis:

  • Powdery Mildew: In humid or excessively moist conditions, Giant Hyssop can be susceptible to powdery mildew, characterized by a white, powdery residue on the foliage. To prevent this fungal disease, provide adequate air circulation, avoid overhead watering, and utilize fungicidal treatments if necessary.

Common Pests

Agastache ‘Blue Fortune’ is generally resistant to most pests and is known for its ability to repel deer. However, there are certain pests that may occasionally pose a threat to the plant, warranting vigilant monitoring and appropriate preventive measures.

Pest Management:

  • Aphids: These small, sap-sucking insects can infest the foliage of Agastache ‘Blue Fortune’, leading to distorted growth and reduced vigor. Rinsing the plant with water and utilizing insecticidal soap can effectively manage aphid infestations, preserving the health of the plant.

Botanist’s Tips

To further enhance the cultivation experience and ensure the optimal growth and performance of Agastache ‘Blue Fortune’, here are some valuable tips from botanists and seasoned gardeners:

  • Companion Planting: Pair Agastache ‘Blue Fortune’ with complementary plants such as Echinacea, Salvia, and Rudbeckia to create visually engaging and ecologically beneficial garden compositions.
  • Pollinator Attraction: Harness the plant’s ability to attract pollinators by incorporating it into pollinator-friendly garden designs, supporting the conservation of vital insect populations.
  • Winter Care: Provide a layer of mulch around the base of the plant in late fall to insulate the roots and protect them from extreme temperature fluctuations during winter.

Fun Facts

  • The fragrance of Agastache ‘Blue Fortune’ is reminiscent of anise or licorice, contributing to its allure and sensory appeal in the garden.
  • Giant Hyssop is valued in herbal medicine for its potential therapeutic properties, including its use as a soothing herbal tea ingredient.

Now that we have gained valuable insights into the caring and cultivation of Agastache ‘Blue Fortune’, it is essential to further expand our knowledge and explore its varied uses, landscape design potential, and its role in supporting wildlife populations.

Links to External Resources

To explore further information about Agastache ‘Blue Fortune’ and its cultivation, the following external resources provide valuable insights and guidance:

  1. Royal Horticultural Society – Agastache ‘Blue Fortune’
  2. Missouri Botanical Garden – Agastache ‘Blue Fortune’
  3. North Carolina State University – Growing Giant Hyssop
  4. University of Florida IFAS Extension – Agastache
  5. Colorado State University Extension – Agastache
  6. The Herb Society of America – Agastache


Agastache ‘Blue Fortune’ stands out as a captivating and versatile addition to gardens, offering a profusion of colorful blooms and aromatic foliage that enriches the outdoor environment. With its resilience, ornamental appeal, and ecological benefits, it is a plant that holds immense value for both gardeners and the broader ecosystem. By adhering to the recommended care guidelines and harnessing the plant’s inherent beauty, Agastache ‘Blue Fortune’ can reign supreme in gardens, providing a visual spectacle and contributing to the support of invaluable pollinator populations. With its enduring charm and engaging attributes, Giant Hyssop has rightfully earned a place as a cherished member of diverse garden landscapes, elevating their allure and ecological significance.

Picture of Peter Taylors

Peter Taylors

Expert botanist who loves plants. His expertise spans taxonomy, plant ecology, and ethnobotany. An advocate for plant conservation, he mentors and educates future botanists, leaving a lasting impact on the field.