Calibrachoa: the colourful plant for small balconies

Calibrachoa is an appealing choice for anyone with limited room, as it thrives in pots while producing a remarkable number of small flowers. With its low-growing, trailing habit, it can create a colourful cascade over window boxes and hanging pots, using the sides of a balcony rather than taking up valuable walking space.

Why does calibrachoa work so well on small balconies?

This plant generally stays compact, producing stems that spread out or trail over the edge of its container. Certain varieties reach roughly 10 to 50 centimetres in height and spread, while their trailing form makes good use of vertical space, balcony railings and hanging supports.

What do the flowers of this plant known as mini petunia look like?

Its small, trumpet-shaped blooms closely resemble petunias, which is why it is called “mini petunia”. Botanically, however, calibrachoa belongs to its own genus within the Solanaceae family. Varieties are available in pink, violet, yellow, red and orange, as well as numerous two-tone combinations.

Given sufficient light, the plant can flower over a long period, creating such a dense display of colour that it almost conceals some of the foliage. To make the most of its trailing growth, the following containers work particularly well:

• hanging pots placed near walls and railings;
• window boxes fitted to the balcony railing;
• tall pots that allow the stems to spill down the sides;
• containers shared with upright-growing plants.

How much sun does calibrachoa need for abundant flowering?

A sunny position is essential for abundant flowering. Keep the pot somewhere bright and, ideally, sheltered from particularly strong winds. On a balcony that receives several hours of direct sunshine, the plant has better conditions for producing fresh buds throughout the season.

How should you care for the plant without waterlogging its roots?

Calibrachoa favours fertile, free-draining growing medium. Although it needs moisture while growing, water must not sit around its roots. The pot should therefore have effective drainage holes and contain a porous medium that lets excess water drain away.

Care is easier when you check the growing medium itself rather than watering at a fixed interval. To keep the plant compact and growing well, take note of these basic measures:

• water once the surface of the growing medium begins to dry;
• do not leave saucers permanently full of water;
• use a light, well-draining compost;
• place the pot in a sunny, sheltered location;
• trim overly long tips whenever needed to restore a compact shape.

What allows this species to make such effective use of a small balcony?

Its compact size combined with trailing growth means it can be positioned in places that would otherwise remain empty. Rather than needing a large flower bed or a wide pot on the floor, calibrachoa can grow in a narrow window box and extend its stems outwards, adding volume without obstructing the way.

The key point is not to mistake its small size for an ability to cope with every condition. To create its characteristic mass of flowers, the plant chiefly requires light, drainage and balanced watering. Once these three needs are met, a single pot can fill a substantial part of a balcony with flowering stems, without demanding the space of a large shrub.