How to Grow Marsh Pennywort
Marsh Pennywort
Hydrocotyle vulgaris
herbMarsh pennywort is a low-growing, creeping aquatic or semi-aquatic plant with round, coin-shaped leaves that float or trail along wet substrates. It thrives in shallow water and marshy conditions, making it ideal for water gardens, aquariums, and bog plantings. The plant is valued for its ornamental qualities and traditional medicinal uses.
When should you plant Marsh Pennywort 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 Marsh Pennywort timeline · Pittsburgh, PA (Zone 6b)
-
Plant Marsh Pennywort
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Marsh Pennywort
Around May 17≈ 30 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Marsh Pennywort dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-10; performs best in zones 6-9
Sign up free to see if Marsh Pennywort grows in your zone — and get a personalized planting timeline.
Get my Marsh Pennywort timeline →Growth Stages
Establishment
2-3 weeksYoung plants with small round leaves begin to root and establish in wet substrate. Growth is slow initially.
Ensure consistent moisture and partial shade during the first 2-3 weeks. Avoid strong currents or disturbance. Monitor for algae growth.
Vegetative Growth
3-6 weeksPlants develop more foliage with characteristic round, kidney-shaped leaves. Stems elongate and begin creeping outward.
Maintain saturated conditions and provide light feeding with balanced aquatic fertilizer if in water gardens. Thin overcrowded growth if needed.
Trailing/Spreading
Ongoing (4+ weeks)Plant becomes a dense, low mat of trailing stems with abundant round leaves. Forms attractive ground cover in wet areas.
Allow natural spreading; prune excess growth to maintain shape. Check for pest issues. Ensure adequate nutrient availability.
Flowering
Intermittent (summer months)Small, inconspicuous white or pale green flowers appear on short stalks above the foliage in warmer months. Flowering is minimal.
No special care needed. Flowers are ornamentally insignificant but indicate plant vigor.
Mature Plant
Indefinite (perennial)Fully established plant forms dense mats of round foliage, spreading readily across wet substrate. Can cover large areas.
Manage growth to prevent overgrowth in contained water gardens. Harvest leaves as needed for culinary or medicinal use.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Hand-remove or use snail traps. Keep plant density moderate to reduce hiding spots. Introduce natural predators like fish.
-
Improve water circulation and reduce excess nutrients. Add shade cloth. Use beneficial bacteria products or targeted algaecides if necessary.
-
Spray with insecticidal soap or neem oil. Improve air circulation. Isolate affected plants.
-
Increase humidity and mist foliage. Use neem oil spray. Remove severely affected leaves.
Uses
Salad Green & Soup
CulinaryYoung, tender leaves can be added raw to salads for a mild, slightly bitter flavor and crisp texture. Older leaves are sometimes cooked in soups or as a pot herb, though palatability varies. [source]
Traditional Herbal Remedy
MedicinalUsed in folk medicine and traditional herbalism (particularly in Asia and Europe) to support circulation and wound healing. Typically consumed as a tea or infusion from fresh or dried leaves. [source]
Water Garden & Aquarium Decoration
HouseholdPopular ornamental plant for outdoor water gardens, ponds, and indoor aquariums. Provides aesthetic appeal with its delicate round foliage and helps oxygenate water in aquatic ecosystems. [source]
Aquatic Habitat & Fish Support
WildlifeProvides shelter, grazing material, and oxygen for aquatic fauna. Young leaves are eaten by fish and invertebrates; dense growth creates habitat for beneficial aquatic organisms. [source]
Botanical Pressing & Terrarium Display
CraftThe delicate round leaves are popular for plant pressing, botanical art, and terrariums, particularly paludarium designs that combine aquatic and terrestrial elements. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest leaves and stems year-round in growing seasons by pinching off or cutting the top 2-4 inches of trailing stems. Frequent harvesting encourages bushier growth. For medicinal use, harvest in mid-morning after dew dries but before heat stress. Can be used fresh or dried (air-dry in cool, well-ventilated area for 1-2 weeks).
Fun Facts
- 🌱 The common name 'pennywort' refers to the coin-shaped leaves, which resemble old English pennies. The genus name Hydrocotyle comes from Greek words meaning 'water' (hydro) and 'cotyledon' (seed leaf).
- 🌱 Marsh pennywort is sometimes called 'water pennywort' and is a distant relative of the culinary herb gotu kola (Centella asiatica), though they are distinct species with different growth habits and properties.
- 🌱 In traditional Asian medicine, similar Hydrocotyle species have been used for centuries to support circulation and wound healing, and the plant is still cultivated in wetland herb gardens throughout temperate Asia.
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Marsh Pennywort planting timeline
Tell us your zip code and we'll calculate exactly when to start Marsh Pennywort 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 Marsh Pennywort timeline →