The Best Oxygenating Pond Plants: A Complete Guide to Choosing and Planting

Pond Planet Myriophyllum Brasiliensis Red Stem

Myriophyllum Brasiliensis Red Stem has bright green feathery foliage above the water with red stems, but when planted deeper, the leaves become a darker red. Plant them so leaves fall underwater, as these are what will oxygenate the pond. Ideally planted in a larger plant basket for growth, position smaller-sized plants no deeper than 25% of the recommended planting depth to allow the plants to mature. 

Pond Planet Potamogeton Crispus

Potamogeton Crispus benefits from being planted in soil either in full sun or part shade. Plant in soil or gravel within a planting basket. They remove nitrates to keep water clear, flowering between May and August. 

Hornwort (Ceratophyllum demersum)

As a native UK species, Hornwort is perfectly adapted to British weather. It grows quickly and loosely without roots during the late spring and summer months. When temperatures drop in late autumn, it sinks to the pond floor to protect itself from frost, bouncing back naturally as the water warms.

Water Crowfoot (Ranunculus Aquatilis)

Water crowfoot provides a dual benefit: excellent underwater oxygenation and beautiful surface aesthetics. Between April and June, it produces small white flowers. For maximum survival rates, plant them in weighted bunches at a maximum depth of 60cm.

Calculating Your Pond Plant Ratios

How Many Oxygenating Plants Do I Need For My Pond?

To maintain a healthy ecological balance, aim for two to three oxygenating plants per square metre of pond surface area.

Can You Have Too Many Oxygenating Plants In A Pond?

Yes, you can have too many oxygenating pond plants. During the photosynthesis process, plants consume oxygen during the darker hours – even oxygenating ones. This can then have the opposite effect than hoped and lead to an unhealthy environment for your pond’s inhabitants.

Step-by-Step Guide: How to Plant Oxygenating Plants in Your Pond

It is important to research the specific needs of the plant you choose. Some floating plants simply sit on the surface, but most oxygenators are submerged and require proper planting.

1. Choose Pond Baskets for Submerged Anchoring

You need pond baskets to plant the majority of submerged oxygenators. Baskets act as an anchor, preventing plants from floating away from their intended spot. Check out our wide range of Pond Plant Baskets to find the right size for your setup. 

2. Use Formulated Aquatic Compost Instead of Soil

Do not use standard garden soil. Aquatic compost, like our Velda Aquatic Compost, is formulated to provide your pond plants with the exact nutrients they need to survive without introducing excess nutrients that cause blanket weed.

Struggling with blanket weed? You can find out how to remove blanket weed with our helpful guide.

3. Press Fertiliser Spikes or Balls  into the Compost

To simplify plant care and boost growth, press fertiliser into the compost. Products like the JBL FloraPond Fertiliser Balls ensure your plants have a slow release of nutrition for healthy, balanced growth.

4. Submerge Plants During the Spring Growing Season

The best time to add new plants to your pond is during the spring or early summer, which is the natural growing season for aquatic plants. Make sure your pond water is clear, balanced, and algae-free before introducing new plants so they have the best chance to thrive.

Frequently Asked Questions (FAQs)

What are the best oxygenating plants for a small pond?

For smaller ponds, Water Crowfoot and Hornwort are excellent choices. They are highly efficient at producing oxygen and can be easily trimmed back if they start to take up too much space.

How many oxygenating plants for my pond?

A good rule of thumb is to have two or three oxygenating pond plants per square metre of pond surface area. This ensures adequate oxygenation without overcrowding the water.

Can you have too many oxygenating plants in a pond?

Yes, you can. During photosynthesis in daylight, plants release oxygen. However, at night, they consume oxygen. If you have too many plants, they can deplete the oxygen levels in the dark, creating an unhealthy environment for your fish. Stick to the recommended two to three plants per square metre.

Do ponds need oxygenating plants?

Yes. While mechanical air pumps and waterfalls help aerate the water, oxygenating plants provide a natural, constant source of dissolved oxygen. They also play a crucial role in filtering out nitrates and preventing algae.

How do you plant oxygenating plants in a pond?

Most need to be planted in pond baskets filled with specialised aquatic compost, topped with gravel to keep the soil in place, and then slowly submerged to their required depth in the pond.