Pond plants against algae in the garden pond: Tips for selection and care

Pond plants against algae in the garden pond: Tips for selection and care

More and more hobby gardeners are interested are interested in the subject pond construction and want to beautify their garden with their own small garden pond. The joy of the pond can be quickly clouded by the enormous growth of algae. Especially a high fish stock, a lush feeding, a minor planting and the resulting nutrient surplus contribute to the fact that many ponds are literally overgrown by algae. Then the water turns greenish and becomes cloudy, whereby the feel-good atmosphere at the garden pond is lowered. Water plants are the best at helping algae, because they keep the pond water in a biological balance. In this guide by Heimhelden.de you will find out which plants are particularly effective against algae and what needs to be taken into account during installation and care.

Which types of pond plants are effective against algae?

If you are looking After aquatic plants are against algae in your garden pond, especially high-consuming plants should be the center of your attention. Ideally, create a plant mix that includes both the shore area and the shallow and deep water zones. The following plant species have proven to be particularly effective for the respective areas, in order to keep the water in the pond as algae-free as possible:

  • Swamp plants, which are particularly suitable for the riparian zone:
    • Zwergbinse (Juncus ensifolius)
    • Igelkolben ( Sparganium erectum)
    • Sumpfiris (Iris laevigata)
  • Plants for the shallow water area in the pond:
    • Schwanenblume (Butomus umbellatus)
    • Fir fronds (Hippuris vulgaris)
    • Pfennigkraut (Lysimachia nummularia)
  • Deepwater plants and Underwater plants:
    • Thousand-leaf (Myriophyllum aquaticum)
    • Hornwort (Ceratophyllum demersum)
    • Thick-leaved Waterweed (Egeria densa)
    • Water-lily (Nyphaea)
  • Floating Plants:
    • Three-forearth Lemna (Lemna trisulca)
    • Swimming fern (Salvia natans)
    • Frog bite (Hydrocharis morsus-ranae)

All these plants have high nutrient requirements and thus deprive the algae of their food base.

How to use pond plants correctly - how does it work?

In principle, pond plants can be used both directly in the substrate and in a special planting basket in the pond. A hardy plant should be placed directly in the pond, as it will not change its location anyway.

Aquatic plants that are not hardy should be cultivated in a basket from the beginning. Then they can easily be brought to their winter quarters in winter. The cultivation in a basket is also recommended for proliferating pond plants.

Ideally, the plants should be used in the pond in late spring. Floating plants are simply placed on the surface of the water, while rooting plants must be inserted into the soil at the correct depth. It is important that only the leafless root area is planted. Alternatively, you can use plastic baskets, lay them out with jute and fill in the appropriate substrate. As a substrate, nutrient-poor loam or Teicherde is best. It is advisable to get used to the pond plants step by step to the cool water. So baskets can be initially supported with stones so that they can be gradually lowered to the cold floor. Water plants that are planted in the ground should flood over several days to prevent the roots from getting a cold shock.

How much fertilizer do pond plants need?

Since the plants in the garden pond are used against algae, Their primary task is to consume the excess nutrients in the water. Only then can the pond be kept algae-free. Accordingly, fertilizer inputs are generally not useful.

Just because aquatic plants have deficiency symptoms such as dull colors, stunted growth or yellow leaf tips does not necessarily mean that fertilizer inputs are needed. Often there are other causes such as too shady location, too many rainy days or too hard water.

Special pond fertilizer should therefore only be used if all other causes can be excluded.

What needs to be considered when cutting?

In order to care for the plants in the garden pond, some species regularly need to be pruned. This applies especially to hardy perennial plants.

Cutting tips for shore and marsh plants

In the riparian and marsh zone there are all sorts of plant species that thrive very vigorously. This includes the cattail or the bulrush. Regularly remove dead, dried-up and withered plant parts from these pond plants. In addition, you should radically cut back the plants to the ground in autumn.

Cutting tips for shallow water plants

There are often annuals in the shallow water area of ​​the garden pond, such as the calamus. You usually do not need a cut. However, if you also want to plant hardy and hardy plants in this area - such as the hardy fir fronds - a pruning is required. It occurs in plants that move their shoots, but only in the spring, before the new budding begins. On the other hand, flowering perennials such as the pennywort are usually cut back in the traditional way before winter.

Cutting tips for underwater plants

In deep water, pond plants such as water lily and water plague are primarily cultivated against algae. The criteria that should be taken into account when cutting, depend entirely on the respective plant species. For example, you should regularly prune and shorten sprawling underwater plants. In addition, it is advisable to cut off a large proportion of the plants before winter, so that rot can be avoided. Water lily perennials are taken out of the water to prune the rhizomes and roots. In addition, the leaves and stems of the water lily should be lighted. However, depending on the water lily species and variety, such a cutting action is only necessary once every two to three years.

Cutting tips for floating plants

Floating plants drift only on the water and are not rooted to the ground. Therefore, you can catch them with a landing net if you want to cut them back. Remove all diseased or miserable parts of the plant. Depending on the weather conditions, floating plants spread relatively quickly. However, they should only cover a third to a maximum of half the water surface. A single pruning in autumn is therefore not enough for many floating plants. Keep an eye on the growth of your plants and cut them back before they proliferate too much.

In which ways can pond plants be propagated against algae?

Planting plants in garden ponds tends to be quite easy. The best way to reproduce in the early summer. The following methods are suitable:

  1. propagation by cuttings
  2. rhizome propagation
  3. propagation by division

The division not only serves for propagation, but can also be used as a rejuvenation measure for pond plants.

How are the pond plants wintered?

All native aquatic plants against algae are hardy and can therefore remain in the garden all year round. They simply pull in their shoots or form so-called winter buds on the ground, which thrive again the following spring. Only exotic perennials are very sensitive to cold. They should therefore be cultivated in the basket so that they can move into a winter quarters in the fall.

A sufficiently large aquarium is perfect as a winter quarters. Alternatively, you can repurpose an old zinc tub or a tub.

The aquatic plants should be wintered in a cool room and not returned to the pond until the middle of May.


Many algae in the pond cause cloudiness , greenish water and can rob the hobby gardener any pleasure in his garden pond. To counteract the growth of algae, there are all kinds of pond plants. Ideally, a combination of riparian and aquatic plants should be used to best protect the water from algae

Artikelbild: Amnuay Jamsri / Bigstock.com