Black knapweed.

De un vistazo

Nivel de cuidados

Fácil

Tipo de planta

Perennial herb

Luz

Full sun

Luz en interior

Sol directo

Riego

Cada 7 a 14 días

Tamaño adulto

30 to 90 cm

Ritmo de crecimiento

Medio

Rusticidad

USDA 3 a 8

Floración

Early summer to early autumn

Cuidados

Plant this in a sunny spot with well draining soil to keep it happy. Watch for aphids during the growing season and trim back spent blooms to encourage more flowers. Ensure the soil does not stay soggy for too long.

Riego

Water deeply during dry spells but allow the soil to dry out slightly between sessions.

Abonado

A light application of compost in the spring is usually plenty for this plant.

Poda

Deadhead spent blooms throughout the summer to promote continuous flowering.

Trasplante

If growing in a container, move to a larger pot every few years when roots become crowded.

Suelo

Loamy or chalky

pH del suelo

Neutral to alkaline

Temperatura

-25 a 30°C

Humedad

40 a 70%

Tolerancia a la sequía

Alta

Longevidad

Short-lived perennial, typically 3 to 5 years.

Resistencia a ciervos y conejos

Moderada

Seguridad

Personas

It is generally considered non-toxic but is not meant for human consumption.

Niños

Keep away from small children as the flower heads can be prickly and the plant is not food.

Alérgenos por contacto

Handling the stems or leaves may cause mild skin irritation in sensitive individuals due to fine hairs.

Alérgenos en el aire

Pollen can be a minor irritant for those with severe seasonal allergies.

Comestibilidad

This plant is not considered edible and may cause digestive upset if consumed.

Cómo identificarla

• Purple thistle like flower heads
• Dark fringed bracts below flowers
• Rough lance shaped green leaves
• Sturdy branching stems

Altura

0,3 a 0,9m

Anchura

0,3 a 0,6m

Hojas

green, gray-green, deciduous

Flores

purple, pink, 2 a 4cm

Problemas frecuentes

• Powdery mildew — A white fungal growth on leaves often caused by poor air circulation or high humidity.
• Aphids — Small insects that cluster on new growth and suck plant sap.

Cómo cultivarla

Propagación

seed, division

Cuándo plantar

spring, autumn

Cuidados en invierno

Cut back dead foliage in late winter to make room for fresh spring growth. No special protection is needed as it is quite hardy.

En maceta

It grows well in large pots but requires excellent drainage to prevent root rot.

Pair this plant with native grasses to mimic a natural meadow ecosystem.

Buenas compañeras

• Ox-eye Daisy — They share similar soil and light requirements in meadow plantings.
• Centaurea jacea — They create a beautiful textural contrast when planted in groups.

Especies parecidas

• Centaurea scabiosa — It is a larger, more robust relative with similar flower structure.

Ciencia

Familia

Asteraceae

Género

Centaurea

Orden

Asterales

Clase

Magnoliopsida

Distribución natural

Europe and parts of Western Asia.

Conservación

It is a common and widespread species not currently under threat.

It thrives in grasslands and meadows by outcompeting grasses for space and providing essential nectar for pollinators.

Valor para la fauna

nectar source, supports diverse insect populations

Polinizadores

abejas, mariposas, polillas

Usos

meadow gardens, pollinator borders, wildflower patches

Taxonomía cotejada con GBIF.

Lo que más preguntan

Does it need deadheading?

Deadheading can encourage a second flush of blooms but leaving them provides seeds for birds.

Is it invasive?

It can self-seed freely in ideal conditions but is generally well-behaved in a garden setting.

De dónde viene el nombre

The genus name Centaurea refers to the centaur Chiron from Greek mythology who was said to have used the plant for healing, while nigra refers to the dark color of the flower bracts.

Bueno saberlo

• It is a classic plant of old hay meadows in the British Isles.
• The flower heads were historically used in herbal medicine to treat various ailments.
• It is highly resilient and can thrive in poor, rocky soils.

También en

• Plantas resistentes a la sequía