Nuphar lutea – Brandy Bottle, Yellow Water Lily – Nymphaeaceae (Eurasia)
Habit: Vigorous water plant floating, leaves lying flat on the water; invading large areas with meter-long rhizomes as thick as your arm on the floor of the pond; very strong-growing.
Average size: Depends on water level; leafe stalkes up to 200 cm long; number/m²: 1.
Flowers: Above water level, like buttercups, up to 4 cm large, golden yellow, June to August; slightly sweet fragrance.
Leaves: Plate-size, perfectly round, pale fresh green, leathery; leaves raised off the water when water is not rough enough; in the first year after planting or at water depths above 250 cm, leaves only underwater; slender, very wavy, light green.
Demands: Sun to semi-shade, likes warmth, frost hardy.
Soil: Very nutritious, swamp, humic or loamy gravel, optimal water depth 75-200 cm, though sometimes 400-600 cm; stagnant or slowly flowing water; moderately tolerant of salt.
Our tip: The rhizomes are filled with air and must be weighed down with a rock to keep them from floating during planting and establishment.