Mexican Fleabane Erigeron karvinskianus growing in wall
How to grow Erigeron karvinskianus

Commonly known as the Mexican Fleabane, Erigeron karvinskianus is vigorous, spreading perennial plant which is native to Mexico, Central America, Colombia and Venezuela. Yet despite its native tropical and subtropical habitats it has managed over a short period of time to acclimatise to the cooler regions of northern Europe where it has become naturalised. It even has a foothold in the temperate climates of the south coast towns of England.

Mexican Fleabane Erigeron karvinskianus leaf flower
How to grow Erigeron karvinskianus
It was first described in 1836 by Swiss botanist Augustin Pyramus de Candolle (1778 – 1841) The species name is in honour of Bavarian naturalist Wilhelm Friedrich Karwinski von Karwin, who according to de Candolle collected the first plants for Western science in Mexico.

It is a great garden plant and ideal fort dry sunny areas although it can be invasive in the milder regions of England and Ireland. It can be used to great effect when under-planted with shrub roses of other such flowering shrubs. It requires little cultivation once established and readily self-sows from seed.

Under favourable conditions you can expect Erigeron karvinskianus to reach a height of up to 15 cm. It has narrow hairy leaves which are prone to dying off at the base if the is induced to bolt.

The aster-like blooms are approximately 1 cm wide with a golden-yellow central disc and a fringe of white ray florets. As the blooms mature the florets turn a pinkish-purple.

Erigeron karvinskianus will perform best in a fertile, well-drained soil that does not dry out in summer. It will need sunny position but will benefit with some midday shade. It is ideal for growing in wall or paving crevices, but be aware that it will often self-seed and become invasive in mild areas. The seeds can even be mixed with a little clay and pressed into hollowed mortar joints in walls. Deadhead spent blooms to prevent the seed heads form which will encourage more blooms. To gain a second flush of blooms, cut Erigeron karvinskianus back to ground level in autumn.

As tough and as vigorous as this plant is, avoid areas prone to excessive damp or waterlogging if you want it to overwinter successfully.

Erigeron karvinskianus received the Award of Garden Merit from the Royal Horticultural Society in 1993.

Main image credit - Simon Eade
In text image credit - Hectonichus

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