Does it need deadheading?

Deadheading helps encourage a longer bloom period, but it is not strictly necessary.

Can it grow in full shade?

It prefers full sun to partial shade for the best flowering performance.

Plant guide

Mexican fleabane.

Erigeron karvinskianus

Pronounced eh-RIJ-er-on kar-vin-SKEE-ah-nus

Also known as Karwinsky's fleabane, Latin American Fleabane, Mexican Fleabane, Mexican daisy, Santa Barbara daisy, Santa Barbera daisy, St Peter Port Daisy

Mexican Fleabane — Photo by Alan Manson (CC BY) via iNaturalist

This charming plant is a wonderful addition to rock gardens or stone walls. It produces a profusion of daisy like flowers that shift from white to pink as they age. You will love how it softens hard edges with its delicate, trailing habit.

Another photo of Mexican fleabane — Photo by zebedeugalinha (CC BY) via iNaturalist

At a glance

Care level: Easy
Plant type: Perennial
Light: Full sun to partial shade
Indoor light: Bright indirect
Water: Every 3 to 7 days
Mature size: 12 to 18 inches
Growth rate: Fast
Hardiness: USDA 7 to 9
Bloom time: Late spring to late autumn

Care

Plant in well draining soil to prevent root rot. Keep an eye out for wilting if the soil dries out too much during hot spells. Deadhead spent blooms to encourage a longer flowering season.

Watering: Water when the top inch of soil feels dry to the touch.
Feeding: Apply a balanced liquid fertilizer during the active growing season.
Pruning: Trim back after the first flush of flowers to promote fresh growth.
Repotting: Repot when the plant becomes root bound or outgrows its container.
Soil: Well draining, gritty soil
Soil pH: Neutral to slightly alkaline
Temperature: -10 to 35°C
Humidity: 40 to 70%
Drought tolerance: High
Lifespan: Short-lived perennial, often treated as an annual.
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes.
Water draining through the pot too quickly.
Stunted growth during the active season.

Safety

People: There is no significant toxicity reported, but ingestion is not recommended.
Pets: This plant is generally considered non toxic to cats and dogs.
Children: Keep away from small children to prevent accidental ingestion of plant parts.
Contact allergens: Handling the foliage may cause mild skin irritation in sensitive individuals.
Airborne allergens: The pollen may trigger mild reactions in those with seasonal allergies.
Edibility: This plant is not considered edible and should not be consumed.

How to identify it

Small daisy like white flowers
Flowers fade to pinkish purple
Fine, hairy, lance shaped leaves
Trailing or spreading growth habit

Height: 0.15 to 0.4m
Spread: 0.3 to 0.6m
Leaves: green, semi-evergreen
Flowers: white, pink, 1 to 2cm

Problems to watch for

By symptom

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Growing it

Propagation: seed, division, cuttings
When to plant: spring, autumn
Overwintering: In colder climates, provide a light mulch around the base to protect the roots. It may die back significantly in freezing temperatures.
In containers: Excellent for containers, especially in hanging baskets or wall planters, provided the pot has good drainage.

Seed

1. Sow seeds on the surface of moist, well-draining soil in spring.
2. Do not cover the seeds as they need light to germinate.
3. Keep the soil consistently moist until seedlings appear.

Plant in wall crevices or between paving stones to create a natural, informal look.

Grows well with

Lavender — They share similar sun and drainage requirements.
Thyme — Both plants thrive in rocky, well-draining soil conditions.

Similar species

Daisy fleabane — It shares the classic daisy-like flower structure.

Science

Family: Asteraceae
Genus: Erigeron
Order: Asterales
Class: Magnoliopsida
Native range: Mexico and Central America.
Conservation: Not of conservation concern, though it is considered invasive in some regions outside its native range.

It naturally colonizes rocky slopes and cliff faces where it can find small pockets of soil.

Value to wildlife: nectar source
Pollinators: bees, butterflies
Uses: rock gardens, wall crevices, container filler, ground cover

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 7/9
Temperature: 6/9
Moisture: 4/9
Nutrients: 3/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need deadheading?: Deadheading helps encourage a longer bloom period, but it is not strictly necessary.
Can it grow in full shade?: It prefers full sun to partial shade for the best flowering performance.

Where the name comes from

The genus name Erigeron comes from the Greek words for early and old man, referring to the hairy appearance of some species. The species name honors Wilhelm von Karwinski, a German naturalist.

Good to know

It is commonly known as Mexican fleabane.
It thrives in the cracks of stone walls.
It self-seeds very readily in garden settings.

Also in

Drought-tolerant plants

Keep your mexican fleabane growing

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.