Getting the right balance of plants is essential for a healthy and thriving pond habitat.
To achieve good visual interest, you may wish to consider getting a combination of foliage and flowers sitting at different levels in and around your pond; bearing in mind that most plants only flower for a few months out of the year.
It is therefore useful to take a note of the height or planting depth, spread, and flowering season of your favourite varieties of pond plant, in order to plan effectively.
You will also need to calculate the pond surface area and depth, to avoid overcrowding, and to ensure that the plants grow to the perfect height in the water.
The positioning of plants is a crucial aspect and will depend on the plant type.
Area Surrounding the Pond
Bog plants nest in the watery area surrounding the pond. Whilst the soil needs to be wet for the plants to thrive, it should not be submerged, so take care to ensure that the border does not fill with water after a downpour.
A few examples of plants that work well in boggy conditions include Astilbe varieties, such as the Astilbe chinensis which has lilac plumes between July and September, and grows to around 30cm high; Typha, also known as bulrush, which feature a round brush like flower on a spiky stem; and Gunnera manicata, which are suitable for larger ponds, with their huge, dramatic leaves.
Shallow Areas at the Edge of the Pond
Marginal plants sit on the edges of the pond, with their roots submerged in the shallow water.
Plants that are ideal include several varieties of Iris, such as the Japanese Iris, which produces dramatic coloured flowers around May to June; the Alisma plantago-aquatica, which is known as the water plaintin, and produces small flowers between June and August; the Calla palustris, which has beautiful large white flowers from June to August; and Mentha aquatica, also known as water mint, which produces many dense clusters of tiny purple flowers between July and October, and grows to 90cm. The latter spreads quickly, so you may need to plant it in a basket to restrict its growth.
The Deepest Areas of the Pond
The most popular deep water plants are of course, water lilies. However, it is important to be aware that there are many different types. You will need to choose your water lilies based on the depth of the pond, as they grow to different heights.
The Nymphaea Alba has large white flowers, and can be planted at 60cm to around 3 metres; whereas the Nymphaea caerulea only needs to be planted at around 20cm, and will produce beautiful blue flowers. There are also red lilies and yellow lilies available that grow to different heights, so your pond can be covered with a burst of colour in the summer.
As well as being beautiful, lilies are also useful. They also provide valuable shade for fish from the hot summer sun, and as their leaves cover the pond, the reduction of sunlight will help restrict algae growth.
Algae can also be stifled by hornwort (Ceratophyllum demersum) and water violets (Hottonia palustris), as they are good examples of plants that feed on the nutrients that algae need to survive.
Choosing Plants for Pond Life
If you are going to keep fish, or just want to encourage natural pond life, then you will need to choose good oxygenators; plants which are fully submerged in the pond and produce oxygen.
These plants make use of the nitrates created from fish waste, and the carbon dioxide released by fish during respiration, converting them into food.
Maintaining this delicate ecosystem is vital for the success of your pond. If you have too many plants, or too many fish, the whole cycle could collapse.
A great plant to start with is Anacharis, as all you need to do is weight the plant, and drop it into the pond. It is a vigorous grower, so make sure you trim it back every now and again to keep it in check. One bunch per square foot should be sufficient for a small pond.
Other varieties of oxygenators include Groenlandia densa, or opposite-leaved pondweed; and Callitriche hermaphroditica or water starwort, although this may grow too rapidly for a small pond. Water cress is also a good oxygenator.
The final step is to ensure you have sufficient time to maintain the pond after you have planted it up. Many of the plants will require specific aftercare, such as trimming back, or cutting away seed heads, and gaining this knowledge at the planning stage will help you to stay on top of the maintenance of your pond.
Please visit my Lifestyle Blog for more pond plant ideas and inspiration.