The Science Behind Preserved Plants

Welcome to the first article in our series exploring the science and processes behind preserved plants. From how they are created to what makes them last, we’ll be breaking down the techniques used to preserve natural foliage in a sustainable way.

Preserved eucalyptus often retains its distinctive fragrance, even after treatment.

Preserved plants are increasingly finding their place in commercial interiors, valued for their long-lasting freshness and minimal maintenance. But behind each preserved leaf or branch lies a fascinating process rooted in science. In this new series, we’ll explore how nature is carefully stabilised to create lifelike greenery that endures.

We begin with capillary action, a quiet yet powerful method used to preserve greenery.

Capillary action refers to the movement of liquid through narrow spaces, such as plant stems without the assistance of external forces. In nature, it’s how water and nutrients travel from roots to leaves. In preservation, we borrow this same principle to deliver a carefully formulated solution into the plant material.

Unlike full immersion methods, capillary action doesn’t require the entire plant to be submerged. Instead, stems are placed in a vessel containing a preservation solution. From there, the plant draws the liquid upwards, gradually replacing its natural sap.

The preservation solution typically contains a combination of glycerin (to prevent drying), humectants (to retain moisture), and preservatives (to reduce the risk of microbial decay). While the precise blend can vary and is often proprietary, the goal remains the same: to stabilise the plant’s appearance while maintaining its texture and colour.

One of the intriguing aspects of this method is how it interacts with different types of foliage. For example, preserved eucalyptus often retains its distinctive fragrance, even after treatment. The reasons behind this are not fully understood, but the plant’s unique oil composition and leaf structure appear to play a role in holding onto its natural scent.

At Steelgrass, we work with suppliers who specialise in this form of preservation, ensuring the preserved plants we use are of the highest quality, hypoallergenic, and sustainably produced. For our clients, this means durable botanical displays that look and feel lifelike, without the need for watering or regular maintenance.

Capillary action is a quiet, science-led process that helps us celebrate the enduring beauty of foliage. By understanding the methods behind preserved plants, we gain a greater appreciation for the craftsmanship – and science – that allows nature to flourish indoors, in a sustainable and lasting way.

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