Choosing aquarium plants: room to grow

A new plant can soften a stone, change a view or fill an overlooked corner. A useful selection begins with a practical question: what space can this plant occupy once established? Its small retail portion tells you little about its eventual outline or the work needed to maintain it.

This guide replaces the old arrival announcement with a lasting method. Before shopping, photograph your aquarium from the front and mark open areas, shaded surfaces and existing plants. Build a list of needs before collecting individual favourites.

The botanical name helps identify the right plant despite varying trade names. Next, check growth form, expected height and width, lighting needs and CO₂ guidance. These details are more useful than a dramatic colour in a photograph.

Profile dimensions are guides: conditions and trimming affect the resulting shape. Allow a margin in narrow spaces instead of choosing a plant that will need constant restraint. Check the supplied format as well; a mature specimen in a photograph may not represent the portion delivered.

These four catalogue plants illustrate different roles in a layout. Living batches can vary in size and appearance; check each listing for its format and availability.

• Anubias barteri nana: an option for dressing wood or stone, including less brightly lit areas.
• Bacopa caroliniana: a stem plant for building an upright group and a repeated rhythm.
• Cryptocoryne wendtii ‘Green’: a rosette for a rooted mass of foliage.
• Limnobium laevigatum: a floating plant for the surface, with attention to the shade it creates below.

These are not a compulsory package. Identify the role your aquarium needs, then check that the chosen plant fits its conditions.

Tissue culture contains young plants; it does not guarantee instant coverage. Two cups of different varieties may cover very different areas. Compare your planting plan and expected development rather than just the container diameter.

Mark three areas on your photograph: planting zones, areas to keep open and access needed for maintenance. Leave room to clean the glass, reach the filter intake and trim plants.

Repeating a plant in several places can connect a layout visually. Too many varieties in a small footprint can make individual groups difficult to distinguish. Start with clear roles: an upright structure, a lower transition and a detail on wood or stone.

Floating plants add another layer. Their placement matters as much as the plants below: regularly observe the areas they shade.

There is no universal number of pots per litre. Two aquariums of equal volume might contain broad planting beds or mostly wood and rocks. Measure the area actually available and divide it between your intended groups.

Make a short list: plant name, planned position, purchased format and estimated quantity. If the budget is limited, finish a coherent group before adding an isolated variety. For a carpet, patience and suitable conditions matter too; buying more cannot resolve a mismatch with your setup.

Prepare plants before starting. Separate stems; plant rosettes in the substrate; keep rhizomes such as Anubias exposed and attach them to the hardscape if desired. Floating plants stay at the surface. Growth form determines the planting method.

For tissue culture, remove and rinse away the growing medium, then divide into portions appropriate to the plant. Do not cut a rhizome into tiny fragments simply because another variety divides easily. Keep plants moist while you work.

Keep each plant’s name and introduction date. Photograph the aquarium from the same position at regular intervals; comparing the space occupied becomes easier than relying on a daily impression.

Record new growth, removed leaves and maintenance. If a problem appears, describe how it develops before changing several variables at once. A successful selection also comes from observation: some plants become the lasting structure of the tank, while others reveal what suits your setup less well.

Continue with our plant care guide and substrate guide.