Lysimachia Moneywort: Aquarium &amp; Pond Care Guide

Aquascaping Tweezers Set·makes precise substrate planting and runner control far easier than fingers

Submersible LED Aquarium Plant Light·prevents legginess and supports compact, bushy growth

Floating Plant Weights·keeps stems anchored near the surface without uprooting

Submerged Planting Basket for Ponds·contains root spread and prevents invasive escape into open water

If your community tank looks a little bare and you're tired of plants that melt within a week, Lysimachia moneywort might be the fix. It's cheap, it's forgiving, and it works in tanks, ponds, and paludariums alike. This guide covers what it actually needs, where it can go wrong, and how to avoid the invasive-species trap some keepers fall into.

Quick Answer: Lysimachia moneywort (often sold as Lysimachia nummularia) is a fast-growing, low-light-tolerant plant that thrives in aquariums, ponds, and bog setups between 60–75°F. It spreads aggressively outdoors and is banned or restricted in several U.S. states, so check local rules before planting it in a pond [1].

What Is Lysimachia Moneywort?

Lysimachia moneywort is a creeping perennial in the primrose family, prized by fish keepers for its round, coin-shaped leaves. Those leaves are how it earned its common name — "moneywort" refers to their small, coin-like shape. The plant grows low and spreads by runners, making a dense green mat over time.

It's native to Europe and parts of Asia, but it has naturalized across much of North America. Cooperative Extension data notes it thrives in wet, shaded soil near streams and ditches [1]. That same toughness is exactly why it does so well in home aquariums.

Creeping Jenny vs Moneywort — Same Plant?

Here's a question that trips up a lot of shoppers: creeping Jenny and moneywort are the same species, just different common names for Lysimachia nummularia. Garden centers usually sell the golden-leaved cultivar as "creeping Jenny" and the green form as "moneywort."

Green form: standard moneywort, hardier and faster-growing
Golden form ('Aurea'): sold as creeping Jenny, slower and less vigorous
Both: same care needs, same invasive concerns

Pro Tip: If you're shopping online and see two listings with different prices for what looks like the same plant, check the leaf color in the photo. Golden leaves mean 'Aurea'; solid green means the standard species.

Is Moneywort Invasive? What Every Fish Keeper Should Know

Yes, moneywort is classified as invasive in several U.S. states, and it spreads fast once it escapes a contained tank or pond. It roots at every leaf node that touches wet soil, so a single dropped stem can start a new colony. This is the single biggest risk for anyone planning to grow it outdoors.

State extension programs list it as a concern for wetlands, streambanks, and slow-moving water [2]. Once established, it can crowd out native plants and reduce habitat diversity. That doesn't mean you can't grow it — it means you need to be deliberate about containment.

Where It's Banned or Restricted

Several states, including Connecticut and Massachusetts, prohibit the sale or planting of Lysimachia nummularia outdoors. Others list it as a "watch species" without a formal ban. Always check your state's noxious weed list before adding it to an outdoor pond.

Common Myth: "It's just an aquarium plant, so it can't be invasive." Reality: Moneywort is one of the most reported garden escapees in the eastern U.S., because clippings root easily in any damp soil nearby [2].

How to Grow It Responsibly

If you keep moneywort in an aquarium only, invasive spread isn't a concern — it can't survive being fully submerged long-term outdoors the way it does in a pond edge. For pond keepers, containment is the key word.

Grow it in a submerged pot or basket, not loose in pond soil
Trim runners before they reach the pond's edge
Never dispose of clippings in storm drains, ditches, or wild areas
Compost cuttings only if your municipal program accepts them

Need an easy carpeting plant for a beginner tank? Check out our complete guide to low-light aquarium plants for practical alternatives →

Growing Lysimachia Moneywort in Your Aquarium

Moneywort adapts to fully submerged aquarium life, though it grows slower underwater than it does emersed. Many keepers report it does best as a background or midground stem plant rather than a true carpet. It tolerates a wide swing in water chemistry, which is why beginners like it.

Water Parameters It Tolerates

Parameter	Range	Notes
Temperature	60–75°F	Prefers cooler tanks; slows above 78°F
pH	6.5–7.5	Wide tolerance, no special buffering needed
Hardness	Soft to moderately hard	Adapts well
Lighting	Medium to high	Grows leggy in low light

Extension agronomy notes describe similar wetland species as tolerant of fluctuating water levels and moderate nutrient loads [3]. That flexibility carries over well to aquarium conditions.

Planting Methods

You have three real options for planting moneywort in a tank:

Substrate planting — bury the stem base in root-friendly substrate for the strongest, bushiest growth.
Floating — let it drift; leaves stay above water and roots trail below.
Attached to hardscape — tie stems to driftwood with thread until roots grip.

Pro Tip: For a fuller look faster, plant several stem cuttings in a small cluster rather than one long single stem. It fills in the gap in half the time.

Many keepers pair a root tab or liquid fertilizer with moneywort to keep leaf color vibrant. A liquid aquarium plant fertilizer on Amazon is an easy add for tanks without a nutrient-rich substrate.

Moneywort in Ponds and Paludariums

Moneywort handles cold better than most aquarium plants, surviving light frost and returning each spring in temperate climates. This makes it a favorite for outdoor ponds and bog-style paludariums where tropical plants would die off in winter. It also tolerates full sun outdoors, unlike most true aquarium species.

Cold Hardiness and Year-Round Growth

In USDA zones 4–9, moneywort typically dies back in hard frost but regrows from roots the following spring. Indoors, under stable tank temperatures, it stays green and active all year. That reliability is part of why it shows up so often on pond plant lists.

Companion Plants

For a paludariums or bog setup, moneywort pairs well with:

Java fern on driftwood above the waterline
Dwarf hair grass along the shallow edge
Pothos cuttings rooted in the emersed section

Pro Tip: If you're building a paludarium and worried about mess, moneywort's shallow root system makes it easy to lift and relocate without disturbing the whole layout.

Golden 'Aurea' vs Green Moneywort — Which Should You Buy?

Feature	Green Moneywort	Golden 'Aurea'
Growth speed	Fast	Moderate
Light needs	Medium	Medium-high
Leaf color	Deep green	Chartreuse/gold
Best use	Tank background, pond edge	Accent color, contrast plant
Recommendation	Best for beginners and fast fill-in	Best for color contrast in planted displays

If your goal is quick coverage on a budget, the standard green form is the better buy — it's usually cheaper per stem and grows faster. Save money and go green unless you specifically want the gold color contrast.

Common Mistakes New Growers Make

The most common mistake is planting moneywort loose in a pond bed instead of a contained pot. This single decision is what turns a manageable plant into an invasive headache. Always container-plant it if there's any outdoor exposure at all.

Other frequent errors:

Assuming low light means no light — it still needs at least moderate lighting to avoid leggy stems
Overcrowding a small tank, which blocks light to lower leaves and causes melt
Discarding trimmings outdoors instead of in sealed trash or accepted compost
Skipping fertilizer in bare substrate tanks, leading to pale, weak growth

A good set of aquascaping tweezers on Amazon makes trimming and replanting runners far less frustrating than using your fingers.

Does Lysimachia Come Back Every Year?

Yes — outdoors, moneywort is a true perennial and returns from its root system after winter dieback. As of 2026, extension horticulture consensus still lists it as reliably cold-hardy through USDA zone 4 [4]. Indoors in a heated aquarium, it simply never goes dormant.

That year-round reliability is part of its appeal for pond keepers who want low-maintenance color without replanting each spring. Updated July 2026 guidance from state extension offices continues to recommend containment measures rather than open planting [1].

Ready to round out your planted tank? See our top picks for beginner-friendly aquarium plants →

A submersible LED aquarium plant light on Amazon helps moneywort hold its color and stay compact instead of growing leggy toward the surface.

Conclusion

Lysimachia moneywort is one of the easiest plants to add real green to a tank, pond, or paludarium without fussing over CO2 or intense lighting. The one rule that matters most: keep it contained if it's anywhere near an outdoor water source. Follow that, and it's a low-cost, low-maintenance plant that earns its spot in almost any freshwater setup.

Sources

Recommended Gear

Liquid Aquarium Plant Fertilizer

keeps moneywort's leaf color deep green and prevents pale, weak growth

Aquascaping Tweezers Set

makes precise substrate planting and runner control far easier than fingers

Submersible LED Aquarium Plant Light

prevents legginess and supports compact, bushy growth

Floating Plant Weights

keeps stems anchored near the surface without uprooting

Submerged Planting Basket for Ponds

contains root spread and prevents invasive escape into open water