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.

Guide botanique

Pink evening primrose.

Oenothera speciosa

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

Aussi appelée Mexican Evening Primrose, Pink Buttercups, Pink Evening Primrose, Pink primrose, Pinkladies, Showy Evening Primrose, White evening primrose, buttercups

Pink evening primrose — Photo de 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.

Une autre photo de Pink evening primrose — Photo de Jenny Saito (CC BY) via iNaturalist

En un coup d'œil

Niveau d'entretien: Facile
Type de plante: Perennial
Lumière: Full sun
Lumière en intérieur: Soleil direct
Arrosage: Tous les 7 à 14 jours
Taille adulte: 1 to 2 feet
Croissance: Rapide
Rusticité: USDA 5 à 9
Floraison: Late spring to mid summer

Entretien

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.

Arrosage: Water deeply once the top inch of soil feels dry to the touch.
Engrais: A light application of balanced fertilizer in early spring is plenty.
Taille: Trim back the foliage after the main flowering flush to encourage a tidy appearance.
Rempotage: If growing in a container, move to a larger pot once the roots fill the current space.
Sol: Sandy, rocky, or well draining soil
pH du sol: 6.0 to 8.0
Température: -20 à 35°C
Humidité: 30 à 70%
Résistance à la sécheresse: Élevée
Durée de vie: Perennial, typically 3 to 5 years.
Parfum: Léger
Résistance aux chevreuils et lapins: Moyenne

Signes qu'il faut rempoter

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

Sécurité

Humains: The plant is generally considered non-toxic but can cause mild irritation if handled by sensitive individuals.
Enfants: Keep away from small children as the plant parts are not meant for consumption.
Allergènes de contact: The foliage can cause mild skin irritation in sensitive people.
Allergènes aéroportés: Pollen may cause mild reactions in those with seasonal allergies.
Comestibilité: This plant is not considered edible and may cause stomach upset if ingested.

Comment l'identifier

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

Hauteur: 0,15 à 0,45m
Envergure: 0,3 à 0,9m
Feuilles: green, gray-green, semi-evergreen
Fleurs: white, pink, 4 à 7cm

Problèmes courants

Powdery mildew — A white fungal growth appears on leaves during humid weather.
Aphids — Small insects that suck sap from new growth.

La cultiver

Multiplication: division, seed, cuttings
Quand planter: spring, fall
Hivernage: Cut back dead foliage in late autumn. Provide a light layer of mulch if you live in an area with harsh, freezing winters.
En pot: 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.

Bonnes associations

Purple coneflower — They share similar sun and water requirements.
Blanket flower — This pairing creates a vibrant, drought tolerant display.
Bouteloua gracilis — The grass provides a nice textural contrast to the soft flowers.

Espèces similaires

Oenothera biennis — A taller, biennial relative with yellow flowers.
Oenothera macrocarpa — Features much larger yellow flowers and a more clumping habit.

Science

Famille: Onagraceae
Genre: Oenothera
Ordre: Myrtales
Classe: Magnoliopsida
Région d'origine: Central and southern United States and Mexico.
Préservation: 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.

Intérêt pour la faune: nectar source
Pollinisateurs: abeilles, papillons, papillons de nuit
Utilisations: groundcover, pollinator garden, rock garden, meadow planting

Au fil des saisons

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Floraison

Fructification

Feuillage

Repères écologiques

Salinité: 2/9
Réaction du sol: 6/9
Lumière: 8/9
Température: 6/9
Humidité: 3/9
Nutriments: 3/9

Taxonomie vérifiée avec le GBIF.

Ce qu'on demande souvent

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.

D'où vient le nom

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

Bon à savoir

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.

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