Nymphaea alba var. rubra, also known as Red Hardy Water Lily or Red Lotus, is a stunning aquatic plant with vibrant reddish-pink flowers. Here's a detailed description and care guide for Nymphaea alba var. rubra:

Description:
Nymphaea alba var. rubra produces large-sized, cup-shaped flowers with numerous petals that range in color from deep pink to reddish-purple. The flowers are held above the water's surface on sturdy stems, creating a striking display in ponds or water gardens. The leaves of Nymphaea alba var. rubra are green and rounded, floating on the water's surface to provide a beautiful backdrop for the colorful blooms. The plant forms a rhizomatous root system that anchors it in the substrate or mud at the bottom of the pond or water garden.

Care Guide:

Lighting: Nymphaea alba var. rubra thrives in full sun to partial shade. It requires a minimum of 5-6 hours of direct sunlight each day for optimal flowering. In outdoor ponds or water gardens, ensure that the plant receives ample sunlight. If the sunlight is too intense, provide some shade during the hottest part of the day to prevent leaf burn.

Water: Water lilies like Nymphaea alba var. rubra are aquatic plants and require water to grow. They prefer still or slow-moving freshwater environments, such as ponds or water gardens. The water depth should be appropriate for the variety, with the leaves floating on the water surface. Maintain a water temperature between 70-85°F (21-29°C) for optimal growth and flowering.

Nutrient Requirements: Nymphaea alba var. rubra benefits from regular fertilization to promote healthy growth and abundant blooms. Use a specialized aquatic plant fertilizer formulated for water lilies. The fertilizer should be rich in essential nutrients, such as nitrogen, phosphorus, and potassium. Follow the manufacturer's instructions for dosage and frequency, as excessive fertilization can lead to algae overgrowth.

Water Quality: Maintain good water quality to support the health of Nymphaea alba var. rubra and other aquatic organisms. Regularly test the water for pH, which should be slightly acidic to neutral (around 6.5-7.5). Ammonia and nitrate levels should be kept low, as they can harm the plant. Perform regular water changes and use a mechanical filter to remove debris and excess nutrients.

Planting: When planting a water lily, ensure that the rhizome is positioned correctly. The rhizome should be planted horizontally in a container with a suitable aquatic planting medium. The container should be placed at the appropriate depth, allowing the leaves to float on the water surface. Avoid burying the rhizome too deeply, as it can inhibit growth.

Pruning: Regular pruning is essential to maintain the health and appearance of your water lily. Remove yellowing or decaying leaves and spent flowers. Trim back overgrown or crowded leaves to allow for proper light penetration. Pruning also helps control the plant's spread and prevents overcrowding in the water garden.

Winter Care: Nymphaea alba var. rubra is a hardy water lily and can withstand cold temperatures. However, if you live in an area with harsh winters, it is recommended to protect the plant by moving it to a deeper part of the pond or using a floating de-icer to prevent freezing around the plant. In extreme cold regions, you can lift the plant and store it in a frost-free area until spring.

By following these care guidelines, you can enjoy the vibrant beauty of Nymphaea alba var. rubra in your pond or water garden. Adjust the care routine based on your specific growing conditions and monitor the plant for any signs of pests, diseases, or nutrient deficiencies. Regular maintenance and care will ensure healthy growth and a profusion of stunning reddish-pink flowers throughout the flowering season.