Common Duckweed vs Matto Grosso Milfoil

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. Matto Grosso Milfoil is a stem plant that usually reaches about 60 cm tall by 10 cm wide.

They also share practical benefits such as fry refuge and shrimp 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 and good refuge for shrimp.

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 is the easier keep when you want the simpler option.

Common Duckweed makes more sense in lower-light scapes.

Common Duckweed is the tidier fit when space is limited.

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

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

Matto Grosso Milfoil gives you more propagation flexibility through stem cuttings and side shoots / offsets.

Matto Grosso Milfoil fits a routine built around moderate light and recommended added CO2, with fast growth, high maintenance, and intermediate difficulty.

Role overlap lands at 22/100 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. Matto Grosso Milfoil 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.

If the tank already has several demanding plants, the easier choice is the one that matches your existing light, CO2, and trimming routine.

Do not buy them as interchangeable plants. Use this comparison to decide which tradeoff matters less in your tank: care demand, mature size, placement, or visual density.

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 Matto Grosso Milfoil overlap enough to invite comparison, but they stop being interchangeable once your tank goals become specific. The main tradeoff is whether you want the plant that better fits your present setup, or the one that only pays off after you change light, feeding, or maintenance habits.