Mimosa: planting, cultivation, maintenance and flowering

There are over a thousand species of mimosa. These shrubs of the kind Acacia and the family of Fabaceae the vast majority of them originate from Australia. They are very decorative. They are cultivated today in all regions of the world. The different most popularized species measure between 4 and 10 meters in height. All are unquestionably beautiful with their light evergreen foliage, sometimes velvety, which comes in countless shades of green, and their glomeruli flowers that illuminate the garden with their golden yellow color. Let’s take a look at when to plant this fast-growing chilly shrub and how to maintain it to take full advantage of its spectacular flowering.

Plant a Mimosa

Spring and fall are the two best seasons to plant a Mimosa, and more precisely in March April or in September October.

Planting a Mimosa in the ground proceeds as follows.

  • Dig a hole three times the size of the root ball to leave enough room for the roots of the Mimosa, which can then spread at their convenience.
  • Take the shrub out of its container.
  • Hydrate the root ball by immersing it for 10 to 15 minutes in a large bucket of water.
  • Place the Mimosa in the center of the planting hole.
  • Fill the hole again with the extracted soil after having mixed it with:
    • drainage elements such as clay balls, gravel or pebbles,
    • heather earth,
    • planting soil.
  • Make sure that the grafting point is flush with the ground level. It should not be buried under any circumstances.
  • Install a stake, taking care not to damage the roots and tie the Mimosa with raffia without tightening the trunk too much.
  • Carefully pack the soil.
  • Water.

It is very important to do not enrich the earth with fertilizer when planting Mimosa. On the other hand, this tree needs a sufficiently acidic soil, hence the interest of enriching the topsoil with heather earth. This limits the risk of chlorosis. Some gardeners have found the solution: at the time of planting, they begin to put a bed of nails at the bottom of the hole in order on the one hand to create a drainage bed and on the other hand to promote the iron intake that the Mimosa needs.

It is possible to to plant a potted mimosa. To do this, we respect the following points.

  • Hydrate the root ball for a quarter of an hour.
  • Select a large pot with a pierced bottom.
  • Place the pot on a solid wheeled tray because once the shrub is installed in its substrate, it can be difficult to move it if this precaution has not been taken.
  • Place pebbles or clay balls on the bottom of the pot,
  • Line the inside with a drainage veil,
  • Prepare a mixture of garden soil, heather soil and planting soil,
  • Place a little of this substrate at the bottom then install the young Mimosa in the center of the pot,
  • Fill in with the rest of the earth,
  • Install a tutor,
  • Pack down without damaging the root ball,
  • Water generously.

As for the Mimosa planted in the ground, above all, no fertilizer is added To the earth.

Maintain a Mimosa

Mimosa does not stand the cold very well and drafts. So we install it under the sun where he can benefit from a heat sufficient. It is planted in well-draining, stony or sandy soil, and slightly acidic.

The Mimosa does not present no particular difficulty in terms of maintenance. It grows quickly when it is installed where the conditions suit it perfectly.


Mimosa hate excess water and stagnant water because they promote the rotting of its roots. It is a tree that prefers rainwater to tap water since it don’t like limestone (with the exception of the species Acacia retinodes) hence the interest of investing in a water collector …

From planting in the ground and during the following two years, it must be watered regularly apart from periods of heavy rains, especially in summer. Thus, the recovery is favored. After two years, it is quite able to withstand periods of drought.

About the Mimosa in pot, it is necessary to water it moderately every evening in summer, then to space the waterings from autumn but it is necessary all the same to ensure that the substrate is always humid. If it is completely dry, the young shrub may suffer considerably.


Only pot-grown Mimosa needs a monthly fertilizer input from March to September. You can use a fertilizer for flowering plants or for Mediterranean plants that just needs to be diluted in the irrigation water.


Every two years In early spring, a Mimosa in a container must be repotted. Repotting can even be done every year if the shrub is growing very fast. In the absence of repotting, a surfacing is required between March and April. This makes it possible to remove the old substrate from the top and replace it with new, more nutritious, to a height of 4 good centimeters.


Mimosa is a little hardy tree since it does not withstand negative temperatures. As soon as the weather reports announce the arrival of the first frosts, it is better to install a lined winter sail around the branches.

For subjects grown in pots, as soon as the outside temperature drops below 3 ° C, precautions must be taken. The best solution is to put the mimosas in a container in a safe frost-free room (but not heated) which must imperatively be equipped with a window.


Mimosa is a fast growing tree, or even very fast, that you may want to prune to control its extent. Apart from this scenario, each year after flowering, it is simply advisable to reduce very moderately the branches which have produced flowers and to remove, if necessary, the stems which have more or less blackened because of the frost. Pruning a few old branches afterwards can be useful to give a nice shape to an older Mimosa.

In order not to be invaded by rejections, it is necessary that delete them as you go by cutting them low to the ground.

Parasites and diseases

Mimosa is appreciated for its beauty and resistance. However, it can fall prey to the pruinose leafhopper (Metcalfa pruinosa) or white leafhopper, a pest of the family Flatidae particularly present in our Mediterranean regions. The purple leafhopper feeds on the sap of the Mimosa. In the event of an infestation, a white veil gradually covers the entire shrub, which eventually dies. We can fight against this sucking insect by attracting its predator the lizard and very frequently spraying water under the leaves of the Mimosa.

Sometimes the mealybugs settle on the mimosas. They are dislodged by spraying these trees with black soap with the addition of a little methylated spirits.

Finally, on the disease side, the only one to fear in the Mimosa is the chlorosis due to iron deficiency. It causes yellowing of the leaves. We must therefore integrate iron sulphate in soil, at the foot of the Mimosa, to put an end to chlorosis.

Flowering Mimosa

Depending on the species or variety, Mimosa flowers at different times of the year but for many of these trees flowering takes place throughout the winter. It is therefore a significant asset to take into account when planning the creation of a landscaped garden for example. In winter, being able to admire evergreen trees covered with golden yellow flower heads is a real delight during this period when the gardens are rather gloomy, soulless …

Note that we can also take advantage of several flowering periods with one and the same tree, which run from January to December. For this, it is enough to plant a Four Seasons Mimosa (Acacia retinodes).

Mimosa flowers are a bright golden yellow and their scent is unique. Their appearance varies depending on the species. Some are cylindrical, others spherical. They can be large or small, isolated or arranged in clusters. All have a large number of stamens which are available in a large palette of yellows. There are also very rare species with purple bloom as’Acacia leprosa ‘Scarlet blaze’.

Finally, we can make pretty fresh flower bouquets to perfume and illuminate its interior as well as sumptuous bouquets of dried flowers because the flowers of Mimosa lend themselves very well to floral art.