Hydrocotyle sibthorpioides: complete guide

Overview

Hydrocotyle sibthorpioides, better known as lawn pennywort or dwarf pennywort, is a fascinating herbaceous plant from the Araliaceae family. This tropical and subtropical plant originates from Africa and Asia and is known for its characteristic round leaves and moisture-loving growing habits. It is an ideal choice for water gardens, wetlands and moisture-loving borders.

Appearance and bloom

Hydrocotyle sibthorpioides grows as a low, spreading groundcover with small, round shield-shaped leaves. The leaves are just 1-2 cm in diameter and give the plant a delicate appearance. Small white flowers appear in summer (June to September), followed by tiny fruits. The plant reaches maximum 5-10 cm in height, making it highly suitable for aquatic settings.

Ideal location

Pennywort thrives best in half-shade to full sun, depending on moisture availability. In wet/boggy terrain it can tolerate full sun. In dry conditions, half-shade is preferable. The plant is very flexible regarding light conditions.

Soil

Hydrocotyle sibthorpioides thrives best in moisture-rich to wet soils. Heavy, clayey soils are actually beneficial. The plant tolerates even temporarily flooded areas. For container growing, use moisture-rich potting soil with extra perlite or peat moss. A pH of neutral to slightly acidic is ideal.

Watering

Regular watering is essential. Keep the soil consistently moist. In warm seasons, daily watering may be necessary. The plant can be planted in shallow water (up to 5 cm submerged). Overwatering is practically impossible with this plant - the more water, the better.

Pruning

Minimal pruning required. The plant grows compact and organizes itself well. Remove only dead or damaged leaves. The plant spreads quickly and can be cut back as needed to maintain compactness.

Maintenance calendar

APRIL-MAY: Growth begins as water warms. JUNE-AUGUST: Peak growth and blooming, regular watering. SEPTEMBER-OCTOBER: Growth slows, water still regularly. NOVEMBER-MARCH: Rest period in colder climates.

Winter hardiness

Hydrocotyle sibthorpioides is frost-sensitive (not winter-hardy in zones below 8-9). At temperatures below 5C the above-ground portion dies back. In warmer regions (southern France, Spain, Portugal) it can overwinter outdoors. In more northern countries, container cultivation or winter protection is needed.

Companion plants

Pennywort works well beside: Wetland plants: Iris pseudacorus, Pontederia. Water plants: Nymphaea (water lilies), Sagittaria. Other moisture-loving plants: Astilbe, Hosta.

Closing

Hydrocotyle sibthorpioides is a unique, moisture-loving groundcover. Perfect for water gardens, pond edges and boggy areas. For more water and wetland plant recommendations, visit gardenworld.app/en.

Gardenworld.app helps you with aquatic garden design and moisture-loving plant combinations.