Tropica 1-2-Grow



Tropica Spirodela polyrrhiza (Greater Duckweed) 1-2-GROW


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Tropica Tissue Culture in Vitro Plant

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£ 5.39

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Spirodela polyrrhiza (Greater Duckweed) - 1-2-Grow Tissue Culture

The Greater duckweed stands out among the duckweeds due to its size and round shape. It is reminiscent of very small frogbit. Spirodela polyrhiza (also spelt S. polyrrhiza) is a true cosmopolitan; it occurs on all continents except Antarctica, from the temperate to the tropical climate zone. This floating plant grows in stagnant to slow-flowing, nutrient-rich, often somewhat shaded waters. Together with other duckweed species, it often forms a closed cover. The round fronds are about 0.5 to 1 cm in size. The upper side is light to medium green, with a reddish tinge in bright light. The underside is reddish to dark red and has a tuft of about 7 - 21 roots. New fronds sprout from "pouches" on the sides, which sooner or later detach. Under unfavourable conditions such as a lack of nutrients or frosty temperatures, the giant duckweed forms 2 - 3 mm wide, kidney-shaped, olive-coloured turions that sink to the bottom. These perennating buds sprout as soon as favourable growth conditions prevail again.

Spirodela polyrhiza is a fairly easy plant, but like other aquarium floating plants it needs a good supply of nutrients, especially macronutrients (nitrate, phosphate, potassium), via the water. Moderate light intensity is sufficient. The plant is tolerant of different pH values and carbonate hardness levels. Like other floating plants, it must be reduced occasionally so that it does not shade the plants below too much. Removal is much easier than with other, smaller duckweed species due to the relatively large fronds. If it appears to disappear when the nutrient supply is poor, you can expect turions to sprout again.


Plant info

Type:Floating plant
Growth rate:High
Height:3 - 5+
Light demand:Low
CO2 :Low



easy aquarium plant

Difficulty: Easy


Download 1-2-GROW Leaflet

New liquid growing media!

If you already know our 1·2·Grow! plants you may notice that they come in a new packaging and in a liquid growing media. The lid is now sealed on the cup. This ensures that the content has never been exposed to possible contaminants.

Sealed for freshness and 100% clean!
The liquid media has made it possible to propose new exciting species to the hobby. They are already perfectly adapted to  underwater growth in your tank!

Small plants with great success. 1•2•Grow! Are very young plants cultivated and delivered directly from our laboratory. The plants are guaranteed to be free from snails, algae and pesticides and therefore are totally harmless for sensitive shrimp and fish. The range offers unique plants!

Success with your aquarium depends largely on the proper plant choice. In a 1•2•Grow! cup you buy a myriad of plants which can be divided into small portions and cover a larger area. Plants are compact from the start so you will experience a dense and beautiful growth, if you give them the right fertilser and CO2 from the start! The range is perfect for small and medium sized aquariums, and your patience will be rewarded...

  1. Carefully take the plant out of the cup and rinse off the growing media under the tap. 
  2. Split the plant in 6-8 portions using sharp scissors. 
  3. Plant portions into the substrate using tweezers. Then watch them grow!
Tropica 1-2-grow

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