Large Speedwell (Veronica Austriaca Subsp. Teucrium ‘Crater Lake Blue’)

Plant: Table of Contents

Plant Profile: Large Speedwell (Veronica austriaca subsp. teucrium ‘Crater Lake Blue’)

Large speedwell, scientifically known as Veronica austriaca subsp. teucrium ‘Crater Lake Blue’, is a stunning perennial plant that is native to Europe. This beautiful plant belongs to the Plantaginaceae family and is commonly grown for its vibrant blue flowers and ground-hugging foliage. In this comprehensive plant profile, we will explore the culture, uses, care requirements, propagation methods, common diseases, and botanist’s tips for growing large speedwell. Additionally, we will uncover some fun facts about this versatile plant and provide links to external resources for further reading.

What is Plant?

Large speedwell, also known as Austrian speedwell, is a low-growing perennial plant with stunning blue flowers. The compact growth habit and vibrant blooms make it a popular choice for rock gardens, borders, and containers. Large speedwell is valued for its ability to provide abundant blue blooms, and its resistance to diseases and pests makes it a low-maintenance plant for both novice and experienced gardeners.

Key Takeaways – Large Speedwell (Veronica austriaca subsp. teucrium ‘Crater Lake Blue’)

  • Scientific Name: Veronica austriaca subsp. teucrium ‘Crater Lake Blue’
  • Common Name: Large Speedwell, Austrian Speedwell
  • Plant Type: Perennial
  • Flower Color: Blue
  • Uses: Rock gardens, borders, containers
  • Notable Features: Compact growth habit, vibrant blue flowers
  • Care Level: Low maintenance
  • Hardiness Zone: 4-8

Now, let’s delve deeper into the various aspects of large speedwell, covering its culture, uses, care requirements, and more.


When it comes to the culture of large speedwell, there are several key factors to consider. These include the plant’s water, sunlight, fertilizer, soil, and pruning needs, as well as its propagation and popularity in gardening.


Garden and Landscape

  • Large speedwell is a valuable addition to garden landscapes, particularly in rock gardens and border plantings. Its vibrant blue flowers and compact growth habit make it a stunning focal point in mixed flower beds and perennial borders.
  • It can also be utilized in container gardening, adding a splash of color to patio planters and hanging baskets.

Pollinator Gardens

  • Large speedwell’s attractive blooms make it an excellent choice for pollinator gardens. Bees, butterflies, and other beneficial insects are attracted to its nectar-rich flowers, making it a valuable addition to wildlife-friendly landscapes.


Large speedwell plants prefer well-drained soil and moderate watering. While they are somewhat drought-tolerant once established, consistent moisture is essential during the initial establishment period and in prolonged dry spells. It is important not to overwater the plant, as waterlogged soil can lead to root rot and other issues.


Large speedwell thrives in full sun to partial shade. It performs best when provided with at least 6 hours of direct sunlight per day. In warmer climates, some afternoon shade can help protect the plant from excessive heat, especially during the peak of summer.


In terms of fertilizer requirements, large speedwell is not particularly demanding. A balanced, slow-release fertilizer applied in early spring can provide the plant with the nutrients it needs for healthy growth and abundant flowering. Avoid over-fertilizing, as excessive nutrients can lead to excessive foliage growth at the expense of flowers.


Large speedwell prefers well-drained, fertile soil with a slightly acidic to neutral pH. Amending the soil with organic matter, such as compost or peat moss, can improve its structure and fertility. Additionally, ensuring good drainage is crucial for preventing waterlogging and root rot.


Regular deadheading of spent flowers can promote continuous blooming and maintain the plant’s neat appearance. Additionally, light pruning in early spring can help rejuvenate the plant and remove any damaged or overgrown foliage. However, large speedwell generally requires minimal pruning beyond the routine removal of old flower stalks.


Large speedwell can be propagated through division or stem cuttings. Division is typically carried out in early spring, separating established clumps into smaller sections and replanting them. Stem cuttings can be taken in late spring or early summer, rooted in a well-draining medium, and then transplanted once they have developed roots.

Container Popularity

Due to its compact growth habit and vibrant blooms, large speedwell is well-suited for container gardening. It can be grown in a variety of container sizes, from small pots to larger planters, and its low maintenance nature makes it an attractive choice for both novice and experienced container gardeners.

Common Diseases

Large speedwell is generally resistant to common plant diseases. However, it may occasionally encounter the following issues:

  • Powdery Mildew: In humid conditions, large speedwell may be susceptible to powdery mildew, a fungal disease that manifests as a white, powdery coating on the leaves. Good air circulation and avoiding overhead watering can help prevent this issue.

  • Crown Rot: Excessive moisture or poorly drained soil can lead to crown rot in large speedwell plants. To prevent this, ensure proper drainage and avoid overwatering.

  • Leaf Spot: Leaf spot diseases, characterized by dark spots on the foliage, can occur in conditions of high humidity and moisture. To minimize this risk, water the plant at the base to keep the foliage dry and reduce humidity around the leaves.

Disease Diagnosis

Diagnosing diseases in large speedwell involves carefully examining the symptoms and assessing the plant’s growing conditions. Common signs of disease include abnormal discoloration, wilting, or spots on the foliage. It is important to note environmental factors such as moisture levels, sunlight exposure, and air circulation when diagnosing plant diseases. If disease is suspected, promptly remove affected plant parts and adjust growing conditions to promote plant health.

Common Pests

While large speedwell is relatively resistant to pests, it may encounter some common garden pests such as:

  • Aphids: These small, soft-bodied insects can cluster on the new growth of plants, sucking sap and causing distortion or yellowing of the leaves.
  • Spider Mites: These tiny pests can cause stippling and webbing on the leaves, particularly in hot, dry conditions.
  • Slugs and Snails: These mollusks can feed on the foliage of large speedwell, leaving behind irregular holes and damage.

Maintaining good garden hygiene, such as removing debris and weeds that can harbor pests, and utilizing organic pest control methods can help manage pest infestations without the need for chemical treatments.

Botanist’s Tips

To ensure the successful cultivation of large speedwell, consider the following tips from botanists and experienced gardeners:

  • Good Drainage: Ensure that the planting site provides adequate drainage to prevent waterlogged soil, which can lead to root rot and other issues.

  • Air Circulation: Plant large speedwell in locations with good air circulation to minimize the risk of fungal diseases such as powdery mildew.

  • Deadheading: Regular deadheading not only promotes continuous blooming but also helps maintain the plant’s appearance and prevents self-seeding in the garden.

  • Mulching: Apply a layer of organic mulch around the base of the plant to conserve moisture, suppress weeds, and provide insulation to the roots.

  • Divided Growth: Periodically divide established clumps of large speedwell to rejuvenate the plants and prevent overcrowding.

Fun Facts

  • The genus Veronica, to which large speedwell belongs, comprises a diverse group of herbaceous perennials, subshrubs, and annuals. It includes species valued for their ornamental flowers, as well as some regarded for their medicinal properties.

  • Large speedwell is known for its ability to attract pollinators, making it a valuable addition to biodiversity-friendly gardens and landscapes.

  • The striking blue flowers of large speedwell can provide a beautiful contrast when planted alongside other flowering perennials and shrubs in the garden.

As we’ve explored the culture, uses, care requirements, and interesting facts about large speedwell, it’s clear that this versatile plant has much to offer to gardeners and landscapes alike. Whether grown for its vibrant blue flowers in the garden or as a low-maintenance addition to container plantings, large speedwell stands out as a visually appealing and environmentally beneficial plant.

As you embark on your journey to cultivate large speedwell in your garden or landscape, consider the valuable insight provided in this comprehensive plant profile. For further information and resources, the following links to external sources can provide additional guidance and inspiration.

Links to External Resources

  1. Royal Horticultural Society – Veronica austriaca
  2. Missouri Botanical Garden – Veronica austriaca
  3. University of Florida IFAS Extension – Speedwell Diseases
  4. Colorado State University Extension – Managing Aphids
  5. University of California Agriculture and Natural Resources – Spider Mites in Landscapes

With the information provided in this plant profile, you are equipped with the knowledge to cultivate and care for large speedwell in your own garden or landscape. Harness the beauty and benefits of this stunning perennial plant and enjoy its vibrant blue flowers for seasons to come.

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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.