How to Grow Nymphaea

Fill a medium-sized plastic water lily basket with 6 inches of sand and compost mixture for planting the nymphaea crowns, the part of the plant from which the leaves sprout. Plant the crowns firmly right above the soil and cover the soil with a layer of river sand and stones. Plant in early spring for blooms in late spring though summer. Water must be at least 70 degrees Fahrenheit for planting tropical varieties. Look for water lily baskets at your local garden supply store. The baskets are designed to grow plants underwater without losing soil.

Sink the basket in at least 12 inches of water, either in a still pond, baby pool or other large container. Don't plant nymphaea in ponds with running fountains or streams, as the plant requires still water to grow and flourish. Place the container in a sunny, windless area where it will get at least six hours of daily sunlight.

Add nutrients to the soil every three to four weeks, if you are planting a tropical variety, or every four to six weeks if you're planting a hardy variety. Nutrient possibilities include sieved garden loom, pure unwashed river sand, 1 part fertilizer with 2 parts loam, or equal parts of compost, loam and rotted cow manure. Adding nutrients is required when growing nymphaea in artificial ponds or containers only, as nymphaeas use natural pond humus when grown in natural ponds and lakes.

Divide nymphaea and repot every year for best results, as these plants are pot-grown. Cut or pull apart fleshy roots and replant immediately in fresh soil mixture.