Giant duck weed

Giant Duckweed (Spirodela polyrhiza) is the largest species of duckweed, featuring larger, thicker floating leaves than common duckweed while retaining the same exceptional ability to absorb excess nutrients. Its vibrant green fronds create a natural floating canopy that provides shade, reduces algae growth, and offers a comfortable environment for fish, shrimp, and fry.

Unlike common duckweed, Giant Duckweed is easier to manage due to its larger size, making it simpler to remove or thin out when needed. It grows rapidly under good lighting and nutrient-rich conditions, making it an excellent choice for planted aquariums, breeding tanks, outdoor ponds, and aquaponic systems.

Hardy and beginner-friendly, Giant Duckweed is an effective natural filter that helps maintain a healthier aquarium by removing nitrates and phosphates from the water.

Care Guide

Difficulty: Easy

Growth Rate: Fast

Placement: Floating

Lighting: Low to High (Medium to High lighting promotes faster growth)

CO₂: Not required

Temperature: 18–30°C (64–86°F)

pH: 6.0–8.0

Water Hardness: Soft to hard

Propagation: Reproduces rapidly by budding, quickly forming new floating colonies.

Why You'll Love It

• Larger and easier to manage than common duckweed
• Excellent at absorbing excess nutrients and reducing algae
• Provides natural shade for fish and shrimp
• Offers shelter for fry and breeding fish
• Fast-growing and beginner-friendly
• Ideal for planted aquariums, shrimp tanks, ponds, and aquaponic systems

Tip: Giant Duckweed grows best in aquariums with minimal surface agitation. Regular thinning will help maintain healthy growth and ensure light reaches submerged plants.