Translation guide
Duckweed is a tiny floating aquatic plant. In Japanese, it is most commonly referred to as 浮き草 (ukikusa), which literally means 'floating grass' and is used for various floating plants, not just duckweed. The specific botanical term is アオウキクサ (aoukikusa).
The speaker wants to refer to duckweed or similar small floating aquatic plants in everyday conversation.
The most common and natural word for duckweed and other small floating plants. It is widely understood and used in daily life.
池に浮き草がたくさん浮かんでいる。
There is a lot of duckweed floating on the pond.
The specific botanical name for common duckweed (Lemna minor). Used in scientific or precise contexts.
アオウキクサは非常に小さな水生植物です。
Duckweed is a very small aquatic plant.
Sometimes written in katakana for emphasis or in scientific contexts, but less common than the hiragana/kanji form.
ウキクサ科の植物は世界中に分布している。
Plants of the duckweed family are distributed worldwide.
The speaker wants to use 'duckweed' metaphorically to describe a person or life that is drifting, rootless, or transient.
Used metaphorically to describe a wandering, unsettled life, similar to the English 'drifter' or 'floating weed'.
彼は浮き草のような生活を送っている。
He leads a drifting life like duckweed.
浮き草 (ukikusa) can refer to any small floating plant, not just duckweed. If you need to be specific, use アオウキクサ (aoukikusa).
An idiomatic phrase meaning a rootless or unstable occupation, such as a traveling entertainer or day laborer.
浮き草稼業で生計を立てるのは大変だ。
It's tough to make a living with a rootless trade.