How Do Preserved Plants Work? Methods, Care and Differences

Preserved plants are natural plant parts that have been treated to retain more of their shape, color and flexibility after harvest. They are no longer living, need no water or grow light, and can't continue to grow.

The process is often called glycerin preservation, but that's a simplification. The method and solution vary between species, plant parts and producers. Capillary uptake through the stem is common for foliage and branches, while flowers and some other materials may be treated through immersion, spraying or several steps.

What is a preserved plant?

A preserved plant has a botanical origin: leaves, branches or flowers have been grown or harvested and then treated. The treatment slows the drying and structural change that would otherwise occur once a plant part is separated from its water supply.

The result shouldn't be confused with a living plant that's dormant. The preserved plant doesn't photosynthesize, doesn't form new roots, and can't be revived by watering. It's used as a decorative natural material.

Larger products can be composite. A preserved tree, for example, may consist of a natural trunk, preserved branches or leaves, and construction parts such as metal, glue, foam and a pot. The product description should therefore state which parts are natural and which are manufactured.

For a broader guide to format and placement, see our guide to low-maintenance potted plants and trees.

What is glycerol – and what role does it play?

Glycerol, often called glycerin, is a trihydric alcohol, or triol. The substance is water-soluble and hygroscopic, meaning it can absorb moisture from its surroundings. Those properties make it useful in many preservation solutions.

In plant preservation, glycerol can help the plant material retain flexibility as its natural water and sap decrease. However, it's an oversimplification to say that pure glycerin permanently replaces the water in every individual cell. Commercial solutions may also contain water, dyes, nutrient or carrier substances, and other components.

Three common preservation methods

The manufacturer should be the source for which method is stated. A fixed process window, such as two to six weeks, doesn't apply to every species and technique. Some processes take days, others longer.

Why do some preserved plants feel soft?

Glycerol and other components can reduce brittleness and help the plant material retain flexibility. But the feel varies. A rose, a eucalyptus leaf, a fern and preserved moss each have a different natural structure and aren't necessarily treated the same way.

Softness is therefore not a reliable test of quality or authenticity. Some products feel firm from the start. Others become firmer in dry air or softer in higher humidity. Very high humidity can instead lead to a sticky surface, color transfer or deformation.

A preserved plant doesn't always feel exactly like a living plant. It can have natural variation and some flexibility, but the treatment, dyeing and time all affect both surface and feel.

Preserved, dried or artificial plant?

Artificial plants don't all feel the same and don't necessarily have identical leaves. Preserved plants aren't automatically more realistic, more environmentally friendly, or longer-lasting either. Material, manufacturing, treatment, usage time and waste all need to be compared for the actual product.

A more in-depth comparison can be found in our guide to dried, preserved and artificial flowers.

Which plants and products can be preserved?

Eucalyptus, boxwood, ferns and several types of foliage are commonly found as preserved material. Roses, hydrangeas and other flowers can be treated using methods that differ from those used for larger green plants.

Not all species and plant parts are equally suited, and a species name doesn't guarantee a specific result. Harvest timing, leaf structure, liquid transport, dyeing and sorting all affect the finished product.

Larger preserved trees can be fully or partly hand-built around a natural trunk. Smaller preserved potted plants can also contain supports, filler and a pot that aren't botanical materials.

When are preserved plants a good choice?

• In dry indoor environments where watering isn't desired.
• In rooms without enough grow light for living plants.
• Where natural-looking foliage is wanted but ongoing plant care should be limited.
• In places where the plant can stand protected from direct sun, heat and touch.
• In projects where the product's fire, material and installation requirements can be documented.

They're less suitable near a shower, kitchen steam, water splashes, radiators, a fireplace, or where people frequently pass by and touch the leaves. A bathroom isn't automatically suitable just because it has ventilation.

Placement and care

• Don't water, mist or shower the plant.
• Place it indoors in a stable, dry climate.
• Avoid direct sun and prolonged strong UV exposure.
• Keep a distance from heat sources and hot fixtures.
• Move the pot or trunk rather than gripping the foliage.
• Remove visible dust very carefully using a soft, dry method the supplier approves.
• Don't use cleaning spray, oil or leaf shine without product-specific approval.
• Occasionally check the trunk, pot, supports and loose parts on larger trees.

Dusting doesn't need to follow a fixed schedule, such as every four or six weeks. Environment, airflow and access determine the need. Too much cleaning can damage the leaves and color.

There's also no universal humidity range for every species and brand. Follow the supplier's advice and avoid both very dry, warm air and prolonged high humidity.

Check this before you buy

1. Ask which parts are preserved. The trunk, leaves, branches, filler and pot can have different origins.
2. Check the overall dimensions. Height, canopy width, pot size and weight are needed for placement and transport.
3. Read the care instructions. They should apply to the actual species and treatment.
4. Check the dyeing. Ask whether the plant is dyed and whether it can transfer color.
5. Assess the environment. Note sun, heat, humidity, water splashes and how close people pass by.
6. Ask for documentation. In public settings, fire properties, emissions and materials may need to be verified.
7. Plan a safe placement. Large trees should stand stably and must not block an escape route or tip over when touched.

Frequently asked questions about preserved plants