Marsh Pennywort
Hydrocotyle vulgaris
Hydrocotyle vulgaris, commonly known as Marsh Pennywort, is a versatile aquatic plant native to wetlands. Its unique round leaves and creeping growth habit make it a popular choice for water gardens and pond edges.
Everything it needs
9 essentials at a glance
Watering
Hydrocotyle vulgaris prefers consistently moist soil.
Water it thoroughly when the top inch of soil feels dry, typically every 1-2 weeks, depending on humidity and temperature. In warmer months, it may require more frequent watering. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and browning leaf edges.
Light
This plant thrives in partial shade to full sun, ideally receiving 4-6 hours of indirect sunlight daily.
It can tolerate some direct sunlight but may require protection during the hottest part of the day. Ideal placement includes near water features or in shaded garden areas.
Soil
Hydrocotyle vulgaris prefers a rich, well-draining soil with a pH range of 6.0 to 7.0.
A potting mix that includes peat moss, perlite, and compost is recommended to ensure good drainage while retaining moisture.
Humidity
This plant thrives in high humidity levels of 50-70%.
To increase humidity, mist the leaves regularly or place a humidifier nearby. Signs of humidity stress include leaf curling and browning tips.
Temperature
The ideal temperature range for Hydrocotyle vulgaris is between 60-75°F (15-24°C).
It is hardy in zones 3-10, tolerating cold temperatures but may suffer in extreme heat. During winter, it prefers cooler temperatures but should be protected from frost.
Fertilizing
Use a balanced liquid fertilizer with an NPK ratio of 10-10-10, applying every 4-6 weeks during the growing season (spring and summer).
Reduce or stop fertilizing in fall and winter. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune Hydrocotyle vulgaris in early spring to remove any dead or damaged leaves and to encourage bushier growth.
Use clean, sharp scissors or pruning shears. Deadheading is not necessary, but removing spent leaves can improve overall appearance.
Repotting
Repot every 1-2 years or when the plant becomes root-bound.
Signs it needs repotting include roots growing out of the drainage holes or stunted growth. Choose a pot 1-2 inches larger in diameter, and gently loosen the root ball before placing it in fresh soil.
Propagation
Propagation can be achieved through division or stem cuttings.
For division, carefully separate the root clumps during the growing season (spring or early summer) and replant them in moist soil. For stem cuttings, take 4-6 inch cuttings, remove lower leaves, and place them in water or moist soil until roots develop.
When it's unhappy
Yellow leaves
Why it happens
Often caused by over-watering or insufficient light.
How to fix it
Adjust watering frequency and ensure the plant receives adequate light.
Wilting leaves
Why it happens
Typically a sign of under-watering or low humidity.
How to fix it
Increase watering frequency and humidity levels.
Browning leaf tips
Why it happens
Can indicate low humidity or nutrient deficiency.
How to fix it
Mist the leaves regularly and consider fertilizing.
Root rot
Why it happens
Caused by overly wet soil and poor drainage.
How to fix it
Ensure proper drainage and reduce watering frequency.
Pest infestations (aphids, spider mites)
Why it happens
Common in dry conditions or when plants are stressed.
How to fix it
Inspect regularly and treat with insecticidal soap or neem oil.
Care through the year
Spring
In spring, repot if necessary and begin a regular watering and fertilizing schedule as growth resumes. Prune any dead leaves to encourage new growth.
Summer
During summer, ensure consistent moisture and consider increasing humidity levels, especially in hot weather. Monitor for pests.
Fall
In fall, gradually reduce watering and fertilizing as the plant enters dormancy. Keep an eye out for any signs of stress.
Winter
In winter, protect the plant from frost and maintain cooler temperatures. Water less frequently, allowing the soil to dry out slightly between waterings.
Toxicity & Safety
Hydrocotyle vulgaris is considered non-toxic to pets (cats and dogs) and children. However, ingestion of large quantities may cause mild gastrointestinal upset.
Good to know
How often should I water my Hydrocotyle vulgaris?
Water your Hydrocotyle vulgaris when the top inch of soil feels dry, typically every 1-2 weeks. Adjust based on humidity and temperature.
What light conditions are best for Marsh Pennywort?
Hydrocotyle vulgaris thrives in partial shade to full sun, ideally receiving 4-6 hours of indirect sunlight daily for optimal growth.
How can I increase humidity for my Marsh Pennywort?
To increase humidity, mist the leaves regularly or place a humidifier nearby, as this plant prefers humidity levels of 50-70%.
When is the best time to propagate Hydrocotyle vulgaris?
The best time to propagate is during the growing season in spring or early summer, using division or stem cuttings.
What should I do if my Hydrocotyle vulgaris has yellow leaves?
Yellow leaves can indicate over-watering or insufficient light. Adjust your watering schedule and ensure the plant receives adequate light.
How often should I fertilize my Marsh Pennywort?
Fertilize every 4-6 weeks during the growing season with a balanced liquid fertilizer, and reduce feeding in fall and winter.
Is Hydrocotyle vulgaris safe for pets?
Yes, Hydrocotyle vulgaris is non-toxic to pets and children, making it a safe choice for households with animals.
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