Plant guide
Fleabane.
Erigeron karvinskianus
Pronounced eh-RIH-jer-on kar-vin-SKEE-an-us
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 is a charming, low-growing perennial that produces a profusion of small, daisy-like flowers for months on end. It's a fantastic groundcover or filler plant for borders, rock gardens, and containers, often spilling gracefully over edges.
At a glance
- Care level
- Easy
- Plant type
- Perennial flowering plant
- Light
- Full sun to partial shade
- Indoor light
- bright-indirect
- Water
- Every 7 to 14 days
- Mature size
- Height: 15-30 cm, Spread: 30-60 cm
- Growth rate
- fast
- Hardiness
- USDA 4 to 11
- Bloom time
- Spring through fall
Care
Ensure good drainage to prevent root rot. Deadhead spent flowers to encourage more blooms and maintain a tidy appearance. While drought-tolerant once established, regular watering will improve flowering performance.
- Watering
- Water when the top inch of soil feels dry. Reduce watering in cooler months.
- Feeding
- Feed lightly in spring and mid-summer with a balanced liquid fertilizer.
- Pruning
- Trim back after flowering to encourage reblooming and maintain shape. Cut back harder in late winter or early spring.
- Repotting
- Repot young plants annually or biennially in spring. Mature plants can be divided.
- Soil
- Well-draining soil
- Soil pH
- Slightly acidic to neutral (6.0-7.0)
- Temperature
- -6.7 to 29.4°C
- Humidity
- 30 to 60%
Safety
- People
- This plant is not known to be toxic to humans.
- Pets
- This plant is generally considered non-toxic to cats and dogs.
- Children
- No specific safety concerns for children, beyond typical caution with any garden plant.
- Edibility
- While not typically considered toxic, it's best to avoid ingesting this plant as it's primarily grown as an ornamental.
How to identify it
- Daisy-like flowers
- Small white to pink petals
- Yellow center
- Hairy stems
- Low-growing habit
- Profuse blooming
- Height
- 0.15 to 0.3m
- Spread
- 0.3 to 0.6m
- Leaves
- green, evergreen
- Flowers
- white, pink, blush, 1 to 2cm
Common problems
- Aphids — Small, soft-bodied insects that can cluster on new growth, causing distorted leaves and stems.
- Spider Mites — Tiny pests that thrive in dry conditions, causing stippling on leaves and fine webbing.
- Root Rot — Fungal disease favored by overly wet soil, leading to wilting and yellowing leaves.
Growing it
- Propagation
- seed, division, cuttings
- When to plant
- spring, fall
Plant it where it can spill over walls or edges, or use it as a groundcover among plants that appreciate good drainage and sun.
Grows well with
- Dianthus (Pinks) — Their low-growing habit and similar bloom time create a lovely carpet effect with the daisies.
- Thymus (Thyme) — Drought-tolerant herbs that appreciate similar conditions and provide a fragrant contrast.
- Sedum (Stonecrop) — Succulent plants that thrive in well-drained soil and sun, complementing the daisy-like flowers.
- Lavender — Its upright form and fragrant blooms offer a nice vertical element and appeal to similar pollinators.
Keep away from
- Overly Wet Soil — Excessive moisture can lead to root rot and fungal diseases, which this plant cannot tolerate.
- Heavy Shade — While it tolerates some shade, deep shade will reduce flowering and can make the plant leggy.
Similar species
- Erigeron glaucus (Beach Aster) — Also a daisy-like perennial in the same genus, but typically larger and native to coastal California.
- Bellis perennis (English Daisy) — A smaller, more compact plant with a similar daisy-like flower, but with different growing habits and needs.
- Osteospermum (African Daisy) — These offer daisy-like flowers but are often more upright and may have different cold hardiness.
Science
- Family
- Asteraceae
- Genus
- Erigeron
- Order
- Asterales
- Class
- Magnoliopsida
- Native range
- Central and Southern Mexico.
- Conservation
- Not considered of conservation concern globally.
It typically colonizes open, disturbed areas and rocky slopes in its native habitat, often growing in crevices.
- Value to wildlife
- nectar source, pollen source
- Pollinators
- bees, butterflies, moths
- Uses
- ornamental, groundcover, cottage gardens
Through the year
Ecological indicators
- Salinity
- 2/9
- Soil reaction
- 6.5/9
- Light
- 8/9
- Temperature
- 7/9
- Moisture
- 3/9
- Nutrients
- 4/9
Taxonomy resolved against GBIF.
Questions people ask
- How much sun does Erigeron karvinskianus need?
- It thrives in full sun to partial shade, performing best with at least 6 hours of direct sunlight daily.
- What kind of soil is best for this plant?
- It prefers well-drained soil and is quite adaptable to various soil types, even poor or rocky ones.
- How often should I water it?
- Water regularly when young, but once established, it's quite drought-tolerant and needs watering mainly during prolonged dry spells.
- When does it bloom?
- It typically blooms from late spring through fall, providing color for a long period.
- Is it invasive?
- In some warmer climates, it can be quite prolific and may spread readily, so it's worth monitoring its reach.
Where the name comes from
The genus name 'Erigeron' comes from Greek, meaning 'early old man', referring to the seed heads that can appear early and resemble old man's beard. The species name 'karvinskianus' honors the German botanist Wilhelm Karwinsky.
Good to know
- It's a prolific self-seeder, so it can spread readily in suitable conditions.
- Its small flowers change color as they mature, often starting white and aging to pink.
- It's quite drought-tolerant once established.
Is your fleabane looking unwell?
This page is a general guide. Pocket Botanist diagnoses problems from a photo of your actual plant, works out watering for your light and conditions, and reminds you when care is due.
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.