It can be very aggressive and spread quickly, so it is best for areas where it has room to roam.

How do I stop it from spreading?

Plant it in a container or a restricted area with a root barrier.

Plant guide

Pink evening primrose.

Oenothera speciosa

Pronounced ee-NOH-ther-uh spee-see-OH-suh

Also known as Mexican Evening Primrose, Pink Buttercups, Pink Evening Primrose, Pink primrose, Pinkladies, Showy Evening Primrose, White evening primrose, buttercups

Pinkladies — Photo by Sam Kieschnick (CC BY) via iNaturalist

This charming perennial is known for its delicate, cup shaped flowers that bloom in shades of white to pink. It is a hardy grower that spreads easily through underground runners. You will love how it brightens up sunny garden beds and meadows.

Another photo of Pink evening primrose — Photo by Jenny Saito (CC BY) via iNaturalist

At a glance

Care level: Easy
Plant type: Perennial
Light: Full sun
Indoor light: Direct sun
Water: Every 7 to 14 days
Mature size: 1 to 2 feet
Growth rate: Fast
Hardiness: USDA 5 to 9
Bloom time: Late spring to mid summer

Care

Plant this in a spot with plenty of sun and well draining soil to keep it happy. Watch for wilting if the soil stays too dry for long periods. It can be quite vigorous, so give it enough space to spread out.

Watering: Water deeply once the top inch of soil feels dry to the touch.
Feeding: A light application of balanced fertilizer in early spring is plenty.
Pruning: Trim back the foliage after the main flowering flush to encourage a tidy appearance.
Repotting: If growing in a container, move to a larger pot once the roots fill the current space.
Soil: Sandy, rocky, or well draining soil
Soil pH: 6.0 to 8.0
Temperature: -20 to 35°C
Humidity: 30 to 70%
Drought tolerance: High
Lifespan: Perennial, typically 3 to 5 years.
Fragrance: Light
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes.
Water sitting on the surface of the soil.
Plant growth slowing significantly.

Safety

People: The plant is generally considered non-toxic but can cause mild irritation if handled by sensitive individuals.
Children: Keep away from small children as the plant parts are not meant for consumption.
Contact allergens: The foliage can cause mild skin irritation in sensitive people.
Airborne allergens: Pollen may cause mild reactions in those with seasonal allergies.
Edibility: This plant is not considered edible and may cause stomach upset if ingested.

How to identify it

Four petaled cup shaped flowers
Soft pink or white petals
Lance shaped or wavy leaves
Spreading habit via rhizomes

Height: 0.15 to 0.45m
Spread: 0.3 to 0.9m
Leaves: green, gray-green, semi-evergreen
Flowers: white, pink, 4 to 7cm

Problems to watch for

AphidsCommon
Powdery MildewCommon
Leaf SpotUncommon
Root RotUncommon

By symptom

Plant problems by symptom

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Growing it

Propagation: division, seed, cuttings
When to plant: spring, fall
Overwintering: Cut back dead foliage in late autumn. Provide a light layer of mulch if you live in an area with harsh, freezing winters.
In containers: It grows well in containers but requires a large pot to accommodate its spreading roots.

Division

1. Dig up a clump in early spring.
2. Use a sharp spade to separate the rhizomes.
3. Replant immediately in well-draining soil.

Pair this with other vigorous, sun-loving perennials to ensure it does not take over the entire bed.

Grows well with

Purple Coneflower · They share similar sun and water requirements.
Blanket Flower · This pairing creates a vibrant, drought tolerant display.
Blue Grama Grass · The grass provides a nice textural contrast to the soft flowers.

Similar species

Common Evening Primrose · A taller, biennial relative with yellow flowers.
Missouri Primrose · Features much larger yellow flowers and a more clumping habit.

Science

Family: Onagraceae
Genus: Oenothera
Order: Myrtales
Class: Magnoliopsida
Native range: Central and southern United States and Mexico.
Conservation: This plant is not of conservation concern and is often considered aggressive in garden settings.

It thrives in dry, sunny, disturbed soils where it outcompetes other plants through rapid rhizomatous growth.

Value to wildlife: nectar source
Pollinators: bees, butterflies, moths
Uses: groundcover, pollinator garden, rock garden, meadow planting

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 8/9
Temperature: 6/9
Moisture: 3/9
Nutrients: 3/9

Taxonomy resolved against GBIF.

Questions people ask

Is it invasive?: It can be very aggressive and spread quickly, so it is best for areas where it has room to roam.
How do I stop it from spreading?: Plant it in a container or a restricted area with a root barrier.

Where the name comes from

The genus name Oenothera comes from Greek words meaning wine and to hunt, while speciosa means showy.

Good to know

It is commonly called Mexican evening primrose.
It spreads rapidly through underground rhizomes.
The flowers often fade from white to a deep pink as they age.
It is incredibly drought tolerant once established.

Also in

Drought-tolerant plants

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.