Caltha Palustris Polypetala Aquatic Pond Plant - Giant King Cup

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Caltha palustris polypetala, commonly known as the Double Marsh Marigold, is a variant of the Caltha palustris species. It is a herbaceous perennial plant belonging to the Ranunculaceae family. The Double Marsh Marigold is known for its vibrant yellow flowers and attractive foliage.

Here's a detailed description and care guide for Caltha palustris polypetala:

Caltha palustris polypetala grows as a clump-forming plant with heart-shaped, glossy green leaves. The foliage emerges in early spring and creates a lush carpet of green throughout the growing season. The plant typically reaches a height of 30-60 cm (12-24 inches) and has a spread of 45-60 cm (18-24 inches). The most distinguishing feature of this variety is its double-flowered blooms. The flowers are bright yellow, large, and pom-pom-like in appearance. They can have numerous petals, creating a full and showy display. The Double Marsh Marigold blooms from late spring to early summer, attracting pollinators like bees and butterflies to the garden.

Care Guide:

Light: Caltha palustris polypetala thrives in full sun to partial shade. It prefers a location with at least 4-6 hours of direct sunlight per day. In hotter regions, it benefits from some afternoon shade to protect it from intense heat.

Water: This plant prefers consistently moist to wet soil. It is well-suited to boggy or waterlogged areas, making it an excellent choice for water gardens or pond edges. Ensure the soil remains evenly moist, but avoid excessive standing water, as it can lead to root rot. Regular watering is necessary during dry periods.

Soil: Caltha palustris polypetala prefers rich, humusy soil that is acidic to neutral. It grows well in moist, loamy soil but can tolerate a range of soil types, including clay. Amending the soil with organic matter, such as compost or well-rotted manure, before planting can improve fertility and drainage.

Temperature: This variety is cold-hardy and can thrive in USDA hardiness zones 3-7. It can tolerate cool temperatures and is even capable of flowering in early spring when temperatures are still chilly. In warmer regions, it appreciates some shade and protection from extreme heat.

Fertilizer: Caltha palustris polypetala generally doesn't require heavy fertilization. Incorporating compost or a balanced slow-release fertilizer into the soil during the growing season can provide the necessary nutrients. Avoid excessive nitrogen fertilizers, as they can promote lush foliage growth at the expense of flowering.

Mulching: Applying a layer of organic mulch around the plants can help conserve soil moisture, suppress weed growth, and regulate soil temperature. Maintain a mulch depth of 5-7 cm (2-3 inches) and keep it a few centimeters away from the base of the plant.

Pruning: Caltha palustris polypetala doesn't require extensive pruning. However, you can remove spent flowers to encourage prolonged blooming. In late fall or early spring, you can cut back the foliage to ground level to rejuvenate the plant for the upcoming season.

Pests and Diseases: This plant is generally resistant to pests and diseases. However, keep an eye out for slugs or snails, especially in damp conditions. Proper spacing and good air circulation can help prevent fungal diseases like powdery mildew.

Caltha palustris polypetala is an attractive and low-maintenance perennial that adds a splash of vibrant yellow color to wetland gardens, pond edges, or other moist areas in the landscape. By providing the right growing conditions, you can enjoy its beautiful double flowers and lush green foliage throughout the spring and early summer.

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Here are some general tips and care guidelines for marginal pond plants:


Research different species of marginal pond plants to find ones that suit your pond's conditions and your aesthetic preferences. Consider factors such as height, flower colour, foliage texture, and seasonal interest when selecting plants.


Observe the natural conditions of your pond, such as sun exposure, soil type, and water movement, and choose plants that are adapted to those conditions. Create different planting zones around the pond, with plants that prefer wet soil closer to the water's edge and those that tolerate drier soil further away.


Marginal plants typically thrive in full sun to partial shade. Some species can tolerate more shade, but for optimal growth and flowering, provide them with at least 6 hours of direct sunlight per day.

Water Depth:

Determine the water depth requirements of the marginal plants you choose. Some plants prefer water up to 6 inches deep, while others can tolerate water up to 12 inches or more. Ensure that the water level remains consistent within the preferred range for the chosen plants.


Marginal plants prefer a rich, loamy soil that retains moisture but is not waterlogged. Amend the soil with organic matter, such as compost or well-rotted manure, to improve its fertility and drainage. Avoid using heavy clay soil, as it can become compacted and restrict root growth.


Dig a hole slightly larger than the root ball of the plant and loosen the soil at the bottom. Place the plant in the hole, ensuring that the crown is level with or slightly above the soil surface. Backfill the hole with soil and gently firm it around the plant to eliminate air pockets. Water thoroughly after planting to settle the soil and provide initial hydration.


Apply a layer of organic mulch around the base of the plants to suppress weeds, conserve moisture, and regulate soil temperature.Use materials like straw, shredded bark, or compost, and maintain a depth of 2-3 inches.


Marginal plants prefer consistently moist soil but should not be waterlogged. Monitor the moisture level regularly and water as needed to keep the soil evenly moist. During hot and dry periods, provide supplemental watering to prevent the soil from drying out.


Marginal plants generally do not require heavy fertilization if the soil is nutrient-rich. However, if growth appears weak or leaves show signs of nutrient deficiencies, apply a balanced slow-release fertilizer according to the manufacturer's instructions.


Remove any yellowing or dead leaves to maintain plant health and appearance. Divide overcrowded plants every few years to prevent competition for resources and promote vigorous growth. Prune back excessive growth to maintain a tidy appearance and to prevent plants from encroaching on other plants or the pond itself.

Winter Care:

Hardy marginal plants can withstand winter temperatures and require minimal care. Cut back dead foliage in late fall or early spring to tidy up the planting area. In colder regions, consider protecting tender plants with a layer of mulch or covering them with burlap during winter to prevent frost damage.

Monitoring and Troubleshooting:

Regularly inspect plants for signs of pests, diseases, or nutrient deficiencies. Address any issues promptly with appropriate treatments, such as organic insecticides, fungicides, or nutrient amendments. By following these detailed tips and providing proper care, you can create a beautiful and thriving planting zone around your pond, enhancing its visual appeal and supporting a diverse ecosystem.

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