How to Grow St. Louis Gold Water Lily
Wikimedia Commons
St. Louis Gold Water Lily
Nymphaea 'St. Louis Gold'
flowerSt. Louis Gold is a stunning day-blooming hardy water lily with fragrant, golden-yellow flowers that float on the water surface. This cultivar is prized for its prolific blooming habit and excellent performance in garden ponds and water features. It thrives in calm water and produces attractive rounded foliage that provides shade and habitat value.
When should you plant St. Louis Gold Water Lily in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example St. Louis Gold Water Lily timeline · Pittsburgh, PA (Zone 6b)
-
Plant St. Louis Gold Water Lily
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
First St. Louis Gold Water Lily blooms
Around Apr 21≈ 4 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact St. Louis Gold Water Lily dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-11; winter hardy in most regions with winter dormancy in cold zones
Sign up free to see if St. Louis Gold Water Lily grows in your zone — and get a personalized planting timeline.
Get my St. Louis Gold Water Lily timeline →Growth Stages
Dormancy/Planting
1-2 weeksRhizome is planted in spring after last frost; emerging shoots are visible at the soil surface
Plant in heavy soil or aquatic planting medium; ensure proper water depth; maintain water temperature above 60°F for growth initiation
Vegetative Growth
3-4 weeksLeaves emerge and float on the water surface; plant develops a robust root system; foliage becomes more abundant
Apply aquatic fertilizer pellets monthly during growing season; thin overcrowded foliage to improve air circulation; monitor water level
Budding
1-2 weeksFlower buds begin to form just below the water surface; buds gradually rise toward the surface
Maintain consistent water depth and temperature; ensure 6+ hours of direct sunlight daily; continue fertilizing every 2-3 weeks
Flowering
2-4 weeks per flower; continuous throughout growing seasonGolden-yellow flowers open during daylight hours on the water surface; flowers are fragrant and typically 3-4 inches in diameter; blooms close at dusk
Remove spent flowers daily to encourage continuous blooming; deadhead promptly; maintain water quality; fertilize every 2 weeks
Seed Formation/Dormancy
Fall through winter; 4-6 months in cold regionsIn fall, flowering decreases as water temperature drops; foliage yellows and dies back; plant enters dormancy below the waterline
In cold zones, protect pond from freezing or move in containers to sheltered location; in warm zones, plant remains dormant but roots survive; reduce fertilizing
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Spray foliage with strong water stream or insecticidal soap; introduce ladybugs; submerge affected leaves for 24 hours
-
Remove and crush beetles by hand; submerge infested leaves; use neem oil spray; encourage fish predation
-
Remove heavily damaged leaves; submerge leaves for 2-3 hours; maintain water quality and healthy growing conditions
-
and
Introduce aquatic snail-eating fish (koi, goldfish); remove by hand; reduce organic debris in pond
-
Remove and discard infected plants; improve water circulation and aeration; avoid overcrowding; maintain proper water temperature
Uses
Ornamental water feature
CulinaryWhile not edible, St. Louis Gold flowers and foliage are prized for creating beautiful ornamental water garden displays and floating floral arrangements. [source]
Pond habitat and pollinator support
WildlifeWater lily pads provide shelter and breeding habitat for frogs, fish, and aquatic insects. The fragrant flowers attract bees and other pollinators, supporting biodiversity. [source]
Fresh floral arrangements
HouseholdGolden-yellow flowers can be cut for fresh water-based flower arrangements that last several days, adding elegance to indoor displays. [source]
Pressed flower crafts
CraftPetals and flowers can be pressed and dried for use in botanical crafts, herbal crafts, and decorative art projects. [source]
Traditional herbal use
MedicinalNymphaea species have been used in traditional medicine systems for their calming and anti-inflammatory properties, though St. Louis Gold is primarily valued ornamentally. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Water lilies are ornamental; harvest by cutting individual flowers at water level in early morning for fresh arrangements. Flowers last 3-4 days in a vase. Remove spent flowers daily from the pond to encourage continuous blooming and prevent seed development that diverts energy from flower production.
Fun Facts
- 🌱 St. Louis Gold was hybridized and named after St. Louis, Missouri; it is a day-blooming lily, opening its flowers in the morning and closing them by evening
- 🌱 Water lilies have been sacred symbols in many cultures—notably in ancient Egypt and Buddhism—and appear frequently in famous artworks, including Monet's iconic water lily paintings
- 🌱 The leaves of water lilies have a waxy, hydrophobic coating that repels water and allows them to float; some species' leaves are so sturdy they can support the weight of a small child
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized St. Louis Gold Water Lily planting timeline
Tell us your zip code and we'll calculate exactly when to start St. Louis Gold Water Lily seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my St. Louis Gold Water Lily timeline →