Lysimachia nummularia

Species description

Care, breeding and tankmates

Plant profile

Placement

Foreground

It is highly versatile and can be placed in the foreground, midground, or even allowed to trail over hardscape. In paludariums or terrariums, it is excellent for growing emersed along the water's edge. In the aquarium, it adds a distinct bright green contrast to darker plants.

Botanical form

Stem

This plant features opposite, round to coin-shaped leaves along a trailing, creeping stem. Its bright, light green coloration is vibrant and refreshing. The stems are somewhat delicate but root easily at the nodes when touching the substrate or hardscape.

Growth

Medium

Under moderate to high light, it exhibits a fast growth rate, especially when grown emersed or floating. Submerged growth is slightly slower but still robust. It can quickly overtake smaller plants if not kept in check through regular trimming.

Substrate

Medium

Lysimachia nummularia, also known as Creeping Jenny, is a highly adaptable stem plant that can root easily in both inert gravels and fine nutrient-rich soils. A substrate depth of 1.5 to 2 inches allows its fine white roots to anchor securely as the plant grows upright or trails along the bottom. While it gathers significant nutrients from the water column, a fertilized substrate encourages thicker stems and larger, healthier leaves.

Column fertilization

Recommended

Liquid fertilization with a standard all-in-one product is usually sufficient to meet its needs. It is not particularly fussy about column nutrients but will show slower growth in very lean setups. Regular water changes help provide trace minerals it appreciates.

Root fertilization

Recommended

It grows well in plain gravel or sand, though a nutrient-rich substrate will accelerate its growth. It readily absorbs nutrients through both its roots and its leaves. Root tabs are not strictly necessary unless the substrate is completely inert.

Trimming

Occasional

Trimming is very easy; simply cut the stems to the desired length to keep it tidy or to prevent it from overshadowing other plants. Regular pruning encourages bushier growth if you want a denser stand. Left unpruned, it will trail beautifully along the substrate or water surface.

Propagation

Cuttings

Propagation is incredibly simple by taking stem cuttings. Any piece of the stem with a few leaves can be replanted and will quickly root. It also naturally propagates by sending out creeping runners.

Sensitivity

Moderate

Creeping Jenny is very hardy and can tolerate a wide range of temperatures, including cold water setups. It prefers good light but can survive in moderate shading. It is highly adaptable and an excellent choice for beginners.

Layout role

Foreground, Midground, group, Background

It is often used to create trailing effects over rocks or wood, providing a natural, overgrown look. Its bright green, round leaves offer excellent textural and color contrast against red plants or grassy species. It is also a staple in cold water aquariums and outdoor ponds.