Eucalyptus (Eucalyptus gunnii) - ornamental shrub - 17 cm pot - Height 40 cm

L'Eucalyptus gunnii is classified as semi-hardy: it can withstand frosts down to around' -10°C in favorable conditions (well-drained soil, sheltered from cold winds). In Mediterranean regions, the Southwest, and mild Atlantic coastal areas, it overwinters in the ground without any special protection. However, in regions with harsh winters (inland Normandy, Alsace, Auvergne), thick mulch at the base, winter fleece for young plants, and a location facing a south-facing wall are essential.

Eucalyptus gunnii is one of the fastest-growing eucalyptus species cultivated in our latitudes, with growth rates of 50 cm to 1 m per year under good conditions. Without pruning, a plant grown in the ground can reach a height of 8 to 15 m in a few decades, or even more in the mildest regions. In practice, regular pruning (annual or biennial hard pruning) allows it to be maintained as a dense 2 to 4 m bush, ideal for small gardens and privacy hedges.

The best time to prune theEucalyptus gunnii is in spring, after the last risk of frost, between March and mid-April depending on the region. To maintain a compact shape and dense blue-green foliage, shorten the stems by a third to a half each year by cutting just above a well-formed node. Hard pruning, that is, cutting all the stems back to 20-30 cm above the ground, can be done every two to three years: it stimulates the growth of new shoots with particularly silvery and aromatic juvenile foliage.

Yes, theEucalyptus gunnii grows very well in a large pot on a sunny terrace or balcony, provided you follow a few essential rules. Choose a container of at least 30 to 40 litres with good drainage at the bottom, filled with a well-draining substrate (all-purpose potting mix mixed with pumice or coarse sand). Water regularly in summer, but never excessively: eucalyptus is more susceptible to root suffocation than drought. Prune regularly to limit its height and encourage a generous, bushy growth habit.

The blue-silver foliage of theEucalyptus gunnii pairs beautifully with contrasting or complementary tones. In a mass planting, combine it with lavenders (Lavandula angustifolia), Russian sage and agapanthus for a Mediterranean composition with consistent exposure and water requirements. The silvery foliage highlights the yellow flowers of yarrow or the red berries of a photinia planted in the background. In a pot, it forms a beautiful graphic duo with blue grasses such as Festuca glauca or Pennisetum glaucum.

TheEucalyptus gunnii is an excellent option for quickly creating a soft, aromatic privacy screen, provided it is planted in a sunny location with well-drained soil. Its rapid growth (50 cm to 1 m per year) makes it possible to obtain a dense plant screen in two to three seasons. For a hedge, space the plants 1 to 1.5 m apart and prune them every spring to stimulate branching and maintain a controlled height. The evergreen foliage ensures a visual and olfactory presence all year round, which is a definite advantage over deciduous hedges.

The best time to plant the Eucalyptus gunnii in the ground is spring, from March to May, once the last frosts have passed, to allow the root system to establish itself well before the following winter. Planting in September is possible in mild regions, but avoid harsh winters. Choose a full-sun location, sheltered from prevailing cold winds. Dig a hole twice as wide as the pot and improve drainage if necessary by adding gravel or pumice to the bottom.