Common Duckweed vs Creeping Jenny

They do not overlap much in exact placement, which is why this comparison is more about adjacent options than true one-for-one replacements.

Common Duckweed is a floating plant that usually reaches about 0.2 cm tall by 1 cm wide. Creeping Jenny is a stem plant that usually reaches about 40 cm tall by 5 cm wide.

They also share practical benefits such as fry refuge, so the decision is not only about looks.

The strongest overlap signals are practical: they offer many of the same practical benefits, including good refuge for fry.

Choose Common Duckweed when its exact growth habit fits the open space you have and you want the finished scape to lean toward its shape, texture, or spread.

Common Duckweed makes more sense in lower-light scapes.

Common Duckweed is the tidier fit when space is limited.

Common Duckweed gives denser visual cover when fish security matters more.

Common Duckweed also suits keepers who want low light and no added CO2, with fast growth, high maintenance, and beginner difficulty.

Choose Creeping Jenny when its shape, mature size, or planting style gives the scape a cleaner finish than forcing Common Duckweed into the same role.

Creeping Jenny is the better pick when you prefer its exact shape and placement style.

Creeping Jenny fits a routine built around moderate light and no added CO2, with fast growth, moderate maintenance, and beginner difficulty.

Role overlap lands at 16/100 and care similarity lands at 76/100. Treat those numbers as a shortcut for the decision, not as a replacement for looking at mature size and placement.

Common Duckweed is free-floating with no substrate required and feeds mainly as a water column feeder. Creeping Jenny is rooted in substrate with inert substrate is fine and feeds mainly as a water column feeder.

Their mature height diverges enough that they stop being true one-for-one replacements.

Also watch that one of them casts noticeably more shade, so the effect on the tank feels different.

If you need a true substitute, keep looking. This pair is more useful as a contrast because the plants ask for different layout decisions once they mature.

A practical way to decide is to imagine the tank six months from now. The better plant is the one that still fits the same space after several trims, not the one that only looks right on planting day.

Common Duckweed and Creeping Jenny look like a comparison pair on the surface, but they usually serve different jobs in a planted tank. The smarter decision is to start from the layout problem you are solving, then choose the plant that belongs in that role instead of comparing them as direct substitutes.