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Home » Achillea. » Black-eyed Susan (Rudbeckia Fulgida Var. Sullivantii ‘Goldsturm’)

All About Black-eyed Susan (Rudbeckia fulgida var. sullivantii ‘Goldsturm’)

Black-eyed Susan, scientifically known as Rudbeckia fulgida var. sullivantii ‘Goldsturm’, is a stunning perennial plant that is beloved by gardeners for its bright and cheerful blooms. This resilient plant belongs to the sunflower family (Asteraceae) and is native to the eastern United States. With its striking yellow flowers and dark central cones, black-eyed Susan adds a pop of color to gardens and landscapes, attracting pollinators and adding visual interest.

In this comprehensive guide, we will delve into the various aspects of the black-eyed Susan plant, including its culture, uses, maintenance, and much more. Whether you are a seasoned gardener or a beginner looking to enhance your green thumb, this article will equip you with the knowledge and tips needed to successfully cultivate and care for black-eyed Susan.

What is Black-eyed Susan (Rudbeckia fulgida var. sullivantii ‘Goldsturm’)?

Black-eyed Susan, botanically classified as Rudbeckia fulgida var. sullivantii ‘Goldsturm’, is a cultivar of the species Rudbeckia fulgida, which is commonly referred to as orange coneflower or perennial coneflower. The ‘Goldsturm’ cultivar is particularly renowned for its prolific blooming, compact habit, and robust nature. The name “Black-eyed Susan” is derived from the appearance of its dark brown or black center, which is surrounded by vivid yellow petals.

Key Takeaways

Before we delve into the detailed aspects of black-eyed Susan care and cultivation, let’s summarize the key takeaways about this vibrant perennial plant.

Scientific Name: Rudbeckia fulgida var. sullivantii ‘Goldsturm’
Common Name: Black-eyed Susan
Family: Asteraceae (sunflower family)
Native Range: Eastern United States
Flower Color: Yellow with a dark brown or black center
Plant Type: Herbaceous perennial
Growth Habit: Upright, clump-forming
Hardiness Zone: 3-9
Sunlight: Full sun to partial shade
Watering: Moderate
Soil Type: Well-draining, fertile soil
Uses: Borders, containers, cut flowers, wildlife gardens

Now, let’s explore the various facets of black-eyed Susan cultivation and care in detail.

Culture

Water

Black-eyed Susans are generally low-maintenance when it comes to watering. Once established, they exhibit good drought tolerance. While they prefer moderately moist soil, they can withstand dry spells. However, it’s crucial to ensure consistent moisture during the initial establishment period, particularly in the first growing season. Water your black-eyed Susan plants deeply 1-2 times per week, allowing the soil to dry out between watering sessions.

Sunlight

These sun-loving plants thrive in full sun to partial shade. Ideally, they should receive at least 6 hours of direct sunlight daily for optimal growth and abundant flowering. In locations with scorching summers, providing some afternoon shade can prevent the plants from wilting or experiencing heat stress.

Soil

Black-eyed Susans prefer well-draining, fertile soil. They are adaptable to various soil types, including loam, clay, and sandy soils. Prior to planting, amend the soil with organic matter such as compost or well-rotted manure to improve its fertility and drainage. A slightly acidic to slightly alkaline soil pH in the range of 6.0-7.5 is suitable for these plants.

Fertilizer

Black-eyed Susans are not heavy feeders, but a balanced, slow-release fertilizer applied in early spring can promote healthy growth and prolific flowering. Additionally, top-dressing the soil with organic compost or mulch in the spring can provide a steady supply of nutrients as it breaks down.

Pruning

Pruning black-eyed Susan plants is relatively minimal. To prolong the flowering period and encourage a compact, bushy habit, deadhead the spent flowers regularly. This involves removing the faded blooms by cutting the stems back to a set of leaves or a lateral bud. Pruning helps the plant direct its energy into producing new flowers rather than seeds. At the end of the growing season, around late fall or early winter, you can cut back the plants to ground level to tidy up the garden and prepare the plants for winter dormancy.

Propagation

Dividing

One of the most common methods of propagating black-eyed Susan plants is through division. Dividing the plants every 3-4 years rejuvenates them, prevents overcrowding, and promotes vigorous growth and flowering. The best time for division is in early spring or early fall, allowing the new divisions to establish before the onset of extreme temperatures. Here’s a step-by-step guide for dividing black-eyed Susan plants:

Water the plants thoroughly a day or two before division to ensure they are well-hydrated.
Prepare the new planting site or containers with well-draining soil and adequate sunlight.
Using a shovel or garden fork, carefully lift the clump of black-eyed Susan from the ground, trying to minimize root damage.
Divide the clump into smaller sections, ensuring that each division has a healthy root system and several shoots.
Replant the divisions at the appropriate depth, water them in, and mulch around the base to conserve soil moisture and control weed growth.

Seed Propagation

Black-eyed Susan plants can also be propagated from seeds, allowing you to grow new plants and expand your garden. Here are the general steps for seed propagation:

Harvest seeds from mature black-eyed Susan plants by collecting the dried seed heads in late summer or early fall.
Store the seeds in a dry, cool location until you are ready to sow them.
In late fall or early spring, sow the seeds directly in the garden bed or in containers filled with well-draining seed-starting mix.
Press the seeds lightly into the soil surface and cover them with a thin layer of soil. Water the area gently to settle the seeds.
Keep the soil consistently moist until the seeds germinate, typically within 10-20 days.
Once the seedlings have developed a few true leaves, thin them to maintain adequate spacing and ensure robust growth.

Container Popularity

Black-eyed Susan plants are well-suited for container cultivation, making them versatile additions to gardens, patios, and balconies. Their compact size and vibrant blooms add a delightful touch to container gardens, attracting pollinators and providing a cheerful display. For container cultivation, select a spacious pot with adequate drainage holes and fill it with quality potting mix. Regular watering and fertilization are crucial for container-grown black-eyed Susans, as the soil in containers tends to dry out more quickly than garden soil.

Common Diseases

Disease Diagnosis

Although black-eyed Susan plants are relatively resistant to diseases, they can occasionally fall victim to certain fungal infections and foliar diseases, particularly in humid or poorly ventilated conditions. Some common diseases that may affect black-eyed Susans include:

Powdery Mildew: A fungal disease characterized by a powdery white coating on the leaves, stems, and flowers. It thrives in warm, dry conditions with high humidity levels.
Septoria Leaf Spot: This fungal disease presents as small, water-soaked spots on the leaves, which gradually develop into larger, tan or grayish lesions with dark borders.
Botrytis Blight: Also known as gray mold, this fungal disease causes the development of grayish-brown patches on the leaves and flowers, eventually leading to their decay.

Prevention and Management

To prevent the onset of diseases, it’s essential to maintain good gardening practices and provide optimal growing conditions for the plants. Here are some preventative measures and management strategies:

Site Selection: Plant black-eyed Susans in locations with good air circulation and adequate sunlight to minimize the risk of fungal diseases.
Proper Watering: Avoid overhead watering, as wet foliage can create a conducive environment for fungal spores to proliferate. Water the plants at the base to keep the foliage dry.
Pruning: Regularly remove and discard any diseased or damaged plant parts to prevent the spread of infections.
Fungicidal Treatment: If disease symptoms are present, applying a fungicidal treatment according to the manufacturer’s instructions can help control the spread of the disease.

Common Pests

Pest Identification

Black-eyed Susan plants are generally resistant to most common garden pests, but they may occasionally encounter pest-related issues. Some pests that can potentially affect black-eyed Susans include:

Aphids: These tiny, soft-bodied insects feed on the plant sap, causing stunted growth and distorted leaves. They often congregate on the undersides of leaves and the tender shoot tips.
Spider Mites: These minuscule pests are known for their webbing and stippling damage on the leaves. They thrive in hot, dry conditions, often infesting plants that are under water stress.
Japanese Beetles: These metallic green and bronze beetles are voracious feeders, skeletonizing the leaves of black-eyed Susan plants. Their feeding activity can significantly damage the foliage.

Pest Management

Preventing and managing pest infestations is crucial for maintaining the health and vigor of black-eyed Susan plants. Here are some effective pest management practices:

Biological Control: Encourage natural predators of pests, such as ladybugs and lacewings, which feed on aphids and other soft-bodied insects.
Horticultural Oils: Apply horticultural oils to suffocate and eliminate spider mites, scale insects, and aphids. Ensure thorough coverage, particularly on the undersides of leaves where pests often congregate.
Handpicking: Handpick and dispose of Japanese beetles by shaking them from the plants into a bucket of soapy water. This method can help reduce their population.
Neem Oil: Neem oil, derived from the neem tree, is an effective and organic solution for controlling a wide range of pests, including aphids, spider mites, and beetles.

Botanist’s Tips

Best Soil for Black-eyed Susan

Well-draining: Ensure that the soil is well-draining to prevent waterlogging, which can lead to root rot and other moisture-related issues.
Fertile: Incorporate organic matter into the soil to enhance its fertility and provide essential nutrients for the plants’ growth and development.
pH: Maintain a slightly acidic to slightly alkaline soil pH in the range of 6.0-7.5 for optimal nutrient uptake by the plants.

Sunlight Requirements

Full Sun: Provide black-eyed Susan plants with at least 6 hours of direct sunlight daily for abundant flowering and strong, healthy growth.
Partial Shade: In regions with intense summer heat, some afternoon shade can help prevent stress and wilting.

Winter Care

Mulching: Apply a layer of organic mulch around the base of the plants in late fall to insulate the soil and protect the roots from extreme temperatures.
Cutting Back: Prune back the plants to ground level in late fall or early winter to tidy up the garden and promote new growth in the following season.

Fun Facts

The common name “Black-eyed Susan” is believed to be derived from the ballad “Sweet William’s Farewell to Black-Eyed Susan” by John Gay, an English playwright and poet.
Black-eyed Susans are the state flowers of Maryland.
Their cheerful blooms are a favorite nectar source for butterflies and bees, making them valuable additions to pollinator gardens.

Links to External Resources

For in-depth information, inspiration, and further exploration of black-eyed Susan plants and gardening, consider referring to the following external resources:

In conclusion, black-eyed Susan (Rudbeckia fulgida var. sullivantii ‘Goldsturm’) is a delightful and versatile perennial plant that enriches garden landscapes with its vibrant blooms and enduring charm. From its cultural requirements to its propagation and maintenance, this resilient plant offers a wealth of possibilities for gardeners, wildlife enthusiasts, and flower aficionados alike. With the right care and attention, black-eyed Susan plants can thrive and bring joy season after season, making them valuable additions to any garden or landscape setting. Whether you are drawn to their wildlife appeal, their cheerful colors, or their historical significance, black-eyed Susans are an exceptional choice for enriching your outdoor spaces with natural beauty and vitality.