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Is Siberian Wallflower Invasive? [5+ Ways To Control Them]

The hardy nature of the Siberian Wallflower makes it able to flaunt its vibrant yellow flowers even in harsh weather conditions. But interestingly, the same nature makes Siberian Wallflower invasive at times. 

Generally, the fast-growing Siberian Wallflower is self-seedling, multiplies naturally and thus becomes invasive when left unattended. Further, the perennial characteristic helps the plant stay longer.

Besides, a few care and maintenance tips can help you host these pollinator-attracting Siberian Wallflower in your garden, overruling the unwanted spread.

Does Siberian Wallflower Spread?

Siberian Wallflower is a flowering hybrid (Erysimum × marshallii), hailing from the European region, adored for its bright yellow clustered bloom. 

Belonging to the mustard family, Brassicaceae, Siberian Wallflower is often confused with the Wild Mustard for having quick germination, growth and spread. 

Generally, under the optimum temperature range of 60 to 75ºF, the plant can grow up to 3 feet in height with 1 to 2 feet of lateral spread. It is possible for the plant to attain these mature heights within a growing season. 

Meanwhile, the increase in Siberian Wallflower height is more prominent during its active growing season, i.e., spring to early summer. Potentially taking over your garden.

A bunch of yellow and orange flowers growing in a garden.
Siberian Wallflower invasion decreases the aesthetics of other garden plants.

Further, the active season is also the Siberian Wallflower bloom time. The clusters of 2-3 cm fragrant flowers produce seeds that disperse into their proximity upon maturity. 

The dispersed seed can germinate, grow and establish into a new plant, thus spreading its territory. 

Fun Fact: The name ‘Wallflower is due to the plant’s nature of popping inconspicuously from the cracks of stone paths and alongside walls or crevices.

Is Siberian Wallflower Invasive?

Due to the exceptional spreading, and self-seeding quality, Siberian Wallflower can be invasive in its non-native area if not attended timely.

Seed from the Siberian Wallflowers gives continuity to the plant’s population. Eventually, the crowding of the plants shades out the remaining plant in the garden.

Further, these plants compete with your garden plants, making them struggle for basics like nutrients, space and light. 

Adding to it is the perennial nature of the plant. As Siberian Wallflowers are hardy, they can easily withstand the cold winter and keep returning year after year. 

It can tolerate temperatures as low as 25ºF and as high as 90ºF.

Unlike the invasive Catmint and Dog Fennel, Erysimum does not completely go dormant in winter but decreases its vegetative growth. Owing to this, it is easier for the plant to revive faster in the next growing season.

So, the chance of Wallflower intimidating its intolerant neighbour is quite high.

However, Siberian Wallflower is not considered invasive in its native range, which includes part of western North America. Here, the plant grows naturally and is a part of the local ecosystems.

How To Control Siberian Wallflower From Spreading?

Before the regular spreading of the plant turns invasive and dreads the surrounding plants, follow the quick tips below.

  • Uproot any Siberian Wallflower seedlings growing out of their place in your garden. Use a trowel for precise removable along with the roots. 
  • Trim the lateral stem of the planted ones at regular intervals to control the size of the plant. This keeps the plant from taking over the entire garden.
  • Try growing the Wallflower in a pot to keep the root from invading the space of other plants in the ground.
  • Pinch back the flowers prior to the seed set to prevent self-seeding and spreading of the plant.
  • Even if you fail to do so, add a layer of plastic mulch to discourage the germination of new seeds. This helps control and prevent the self-seeding of the plant.
  • In severe conditions of Siberian Wallflower invasion, use glyphosate or 2,4-D herbicides during the active growing season to effectively manage them. 

From Editorial Team 

Be Aware of the Plant Toxicity!

Being a pet parent and raising toxic plants like Siberian Wallflowers could be tough.

The co-existence of both your pets and plants depends on how well you try to keep them at a distance. 

Using a pet deterrent can make your job a little easier, or simply place the plant out of your pet’s reach.

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