Plants That Clean Water in Ponds: 5 Best Species for Crystal Clear Ponds

Adding the right aquatic plants is one of the most natural and effective ways to clean and clarify pond water. The correct plants will absorb excess nutrients filter contaminants and oxygenate the water – creating an environment where algae cannot thrive.

In this guide we’ll cover 5 of the best pond plants for cleaning and clarifying water along with key facts on how aquatic plants keep ponds pristine.

Why Plants Clean Pond Water

Aquatic plants clean ponds in a few key ways:

• Absorb excess nutrients – Plants soak up nutrients like nitrogen and phosphates that would otherwise fuel algae growth. This starves algae blooms.

• Provide shade – Floating plants block sunlight from fueling photosynthesis in algae. Less sun means less algae.

• Oxygenate water – Plants release oxygen into the water through photosynthesis. This benefits fish and aerobic bacteria that keep ponds healthy.

• Filter water – Dense roots trap and absorb debris, chemicals, and sediment as water passes through aquatic plant stands.

• Compete with algae – Plants and algae both need the same basic nutrients and minerals to grow. Plants win this battle and keep algae in check.

5 Best Pond Plants for Cleaning Water

Here are 5 of the top plant species to use for clarifying cloudy, green ponds naturally:

1. Water Lettuce

This floating plant has leaves that resemble small cabbages. It forms a dense mat covering the water’s surface. The underwater roots trailing below provide excellent filtration. Water lettuce grows fast and spreads readily.

2. Taro

Also called elephant ear, taro has huge heart-shaped leaves that emerge on long stalks. It thrives planted in shallow water up to 12 inches deep. The extensive root system absorbs and filters a heavy nutrient load.

3. Canna

Known for large, lush leaves and vivid blooms, cannas grow well in saturated soils at pond edges. The roots efficiently remove contaminants and create clear water around the plants. They also provide shade to deter algae.

4. Water Iris

These pond irises have upright, sword-like foliage and showy blooms in shades of blue, yellow, white or purple. Plant in shallow water or wet soil. Water irises are heavy feeders, absorbing lots of excess nutrients.

5. Hornwort

The fine, feathery underwater foliage of hornwort provides surface area to absorb dissolved nutrients. Hornwort also releases ample oxygen. It’s easy for beginners to grow and is excellent for ponds with fish.

Photo by Aron Visuals on Unsplash

How to Use Plants to Clarify Cloudy Ponds

If your pond water is cloudy, green, or choked with algae, strategically adding aquatic plants can help restore balance and clarity. Here’s a simple action plan:

• Clean up excess algae – Remove as much string algae, debris and muck as possible through skimming, raking and using an algaecide. Give plants a clean slate.

• Select the right plants – Choose varieties that absorb high nutrient loads and provide shade. Aggressive spreaders like hornwort are ideal for fast relief.

• Spot treat problem areas – Cluster oxygenating and floating plants in the worst locations first, then expand from there for full coverage.

• Reduce future nutrient input – Cut back on fish feeding, control runoff sources, and clean filters regularly to starve algae of fuel.

• Be patient – It takes time for the plants to become established and visibly clear the water. Monitor and supplement as needed.

Other Beneficial Ponds Plants

While not as efficient for filtration, some other plants provide additional benefits:

• Water lilies – Hardy varieties add vibrant flowers and broad leaves that shelter fish. Their shade also deters algae.

• Marginal plants – Rushes, grasses and plants like arrowhead grow on pond edges, stabilizing banks and absorbing some nutrients.

• Moss balls – These compact algae balls slowly roll around ponds absorbing nutrients. They also shelter fry and small critters.

No matter your specific needs, there is a blend of pond plants perfect for keeping water clean, clear and healthy in a natural, chemical-free way.