If you are collecting duckweed from the wild, please make sure that the pond you get it from isn't contaminated or polluted. Duckweeds (Lemnaceae family) are great for absorbing heavy metals and other pollutants.
By the way, duckweed is a common name and may mean different plants in different regions. There are 3 divisions in the genera:
1. Wolffia - no roots
2. Spirodela - several rootlets, purple underside (2.5 - 3.5 mm width)
3. Lemna - single root (<3.0 mm)
By the way, duckweed is a common name and may mean different plants in different regions. There are 3 divisions in the genera:
1. Wolffia - no roots
2. Spirodela - several rootlets, purple underside (2.5 - 3.5 mm width)
3. Lemna - single root (<3.0 mm)