How to Grow Water Hawthorne
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Water Hawthorne
Aponogeton distachyos
aquatic plantWater hawthorne is an aquatic perennial plant native to South Africa, known for its delicate, vanilla-scented white flowers with dark anthers that rise above the water surface. It thrives in cool water environments and is popular in ponds and water gardens. The plant produces attractive floating leaves and is valued for both its ornamental appeal and its role in oxygenating water.
When should you plant Water Hawthorne in your zone?
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Example Water Hawthorne timeline · Pittsburgh, PA (Zone 6b)
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Plant Water Hawthorne
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Water Hawthorne
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Water Hawthorne dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 6-10, prefers cooler waters in zones 6-8
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Dormancy/Rest
June-August (in cooler climates); varies by regionPlant enters dormancy during hot summer months; tuber remains viable in pond substrate or can be stored in cool conditions
Reduce light exposure during summer rest period; maintain water quality; store dormant tubers in cool, moist peat if removing from water
Spring Growth
4-6 weeksTuber sprouts and produces first runners with small leaves emerging toward water surface
Ensure water temperature is rising gradually; apply aquatic plant fertilizer; remove any algae competing for nutrients
Vegetative/Leaf Development
4-8 weeksPlant develops elongated floating leaves on runners; dark green, lance-shaped leaves appear at water surface
Maintain consistent water depth; ensure adequate light; thin overcrowded foliage to improve water circulation; monitor for pests
Flowering
8-12 weeks (spring and fall)Delicate two-spiked white flower clusters emerge above water on stalks; flowers have dark anthers and vanilla scent
Maintain water level to keep flower spikes partially above water; pollinate by hand if no insects present; deadhead spent flowers to encourage more blooms
Seed Production/Maturation
4-6 weeksAfter flowering, plant may produce seeds; energy gradually redirects to tuber as water temperature changes; plant prepares for dormancy
Allow flowers to fully mature if collecting seeds; reduce fertilization as seasons change; allow plant to naturally decline as temperatures shift
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Remove by hand; introduce snail predators like dragonfly nymphs; maintain water quality to discourage population explosion
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Spray with strong water jet from hose; introduce ladybugs; use insecticidal soap safe for aquatic plants
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Remove debris where they hide; introduce diving beetle predators; maintain pond cleanliness
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Reduce nutrient overload; add barley straw extract; ensure adequate plant coverage to shade water; perform partial water changes
Uses
Pond and Water Garden Decoration
OrnamentalWater hawthorne's vanilla-scented flowers and attractive floating foliage make it an excellent ornamental choice for decorative ponds and water gardens. Its blooms provide visual interest and fragrance during spring and fall seasons. [source]
Water Oxygenation and Aquatic Habitat
WildlifeThe plant produces oxygen through photosynthesis, improving water quality and providing habitat for aquatic insects, fish, and microorganisms. It helps maintain ecological balance in pond ecosystems. [source]
Edible Flowers
CulinaryThe vanilla-scented flowers are edible with a mild, sweet flavor and can be used as a delicate garnish for salads, desserts, or beverages. Some culinary applications use them for their visual appeal and subtle flavor. [source]
Natural Fragrance Source
HouseholdThe distinctive vanilla fragrance of water hawthorne flowers can naturally perfume a garden space or be used in floral arrangements. The scent is especially noticeable in early morning or cool evenings. [source]
Traditional Herbal Uses
MedicinalIn traditional South African medicine, water hawthorne has been used to support various health purposes, though scientific research on its medicinal properties is limited. Modern use is primarily ornamental. [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 hawthorne is not typically harvested for culinary or commercial use. Cut flowers can be harvested in early morning when they open for indoor enjoyment (they have a pleasant vanilla fragrance). Seeds may be collected after flowers fade by placing seed heads in shallow containers. Allow leaves to remain on plant to support photosynthesis and water oxygenation.
Fun Facts
- 🌱 Water hawthorne is native to South Africa and is sometimes called 'Cape pondweed' or 'Ouvirandra distachya' in older botanical literature.
- 🌱 The plant exhibits a unique phenology pattern, blooming in spring and fall but entering dormancy during the hot summer months—essentially flowering twice per year in ideal climates.
- 🌱 The vanilla scent of water hawthorne flowers is strongest in cool mornings and evenings, making early dawn the best time to enjoy their fragrance.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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