French broom, a superb flower shrub

French broom shrub branches and flowers

French broom is a fantastic shrub with yellow flowers that blooms in spring.

Key French broom facts

NameGenista monspessulana
FormerlyCytisus monspessulanus
Family – Fabaceae
Type – shrub

Height – 6 ½ feet (2 meters)
Exposure – full sun
Soil – ordinary, rather sandy

Foliage – deciduous
Flowering – April to June
Invasive risk – high risk

Easy to care for, the planting and pruning contribute towards increasing growth and blooming of French broom. Note that in North America, French broom is regulated as an invasive weed, so consider these alternatives instead.

Planting French broom

If purchased in a container, French broom can equally be planted in fall or spring, as long as it doesn’t freeze.

But as is the case for most shrubs, planting it during the month of November is when you’ll best ensure that it settles in perfectly.

If you must plant your French broom in spring, provide for regular watering over the first summer.

Propagating French broom

Seeds ripen in a seed podMaking cuttings is the easiest and fastest method to propagate French broom.

  • The best season for cuttings is summer, on wood that hasn’t born flowers yet.
  • The ideal substrate is special cutting soil mix.

However, each shrub produces thousands of seeds every year. These germinate easily when they’re given lots of light. It’s actually what makes this shrub so invasive.

Pruning and caring for French broom

French broom is a shrub that is easy and only requires very little care, both for pruning and for watering.
It is preferable to not prune it too early after planting, so that it may quickly grow into its natural shape.

In the subsequent years, prune the sprigs of the year on the French broom after the blooming more or less by half.

You can also reshape your French broom to a nice shape just after the blooming.

Watering French broom

As regards watering, the first year is the only year where regular watering is needed.

Learn more about French broom

This shrub bears flowers abundantly and it is very colorful, a real ball of fiery gold for the most part of spring.

Its growth is relatively fast and it adapts well to most soil and climate types. French brooms only live for a few years, 5 at most, which means they must be replaced after this span of time.

You can also propagate it after 2-3 years by preparing cuttings, which is a great way to replace the mother plant regularly.

Very hardy to freezing and cold, rest assured that it won’t suffer in any way even when temperatures drop to 5°F (-15°C).

French broom, an invasive fire hazard

On top of being invasive, you should know that French broom actually fuels forest fires! Indeed, part of this plant’s strategy is to help fires wipe native plants out. The somewhat fire-resistant seeds can then sprout and conquer the land! Don’t plant this near your house if the area is prone to drought and fire hazards.

The most common broom shrub varieties are:

  • Cytisus albus – Cute white flowers in spring.
  • Cytisus beanni – Very beautiful intense yellow blooming.
  • Cytisus purpureus – Very appealing original purple color.
  • Cytisus kewensis – Delicate creamy white blooming.
  • Cytisus scoparius – The most common variety, with its distinctive golden yellow color. Other name for it: common scotch broom

Read also:

Smart tip about French broom

In order to protect roots from the cold in winter, go natural and mulch the foot of the tree with plant-based mulch.

The sprigs collected during the pruning are used to make brooms.

Image credits (edits Gaspard Lorthiois):
CC BY 2.0: Don Loarie
CC BY-SA 4.0: Eddie Dunbar, Tony Rebelo