Centaurea macrocephala

Genus: Centaurea

Species: macrocephala

Family Name: Compositae/Asteraceae

Seed Catalogue No.: 306

English Name(s): Giant Knapweed

Hardiness: Hardy

Lifecycle: Perennial

Suitable for: Cut Flowers

Colour: Yellow/Orange

Flowers: May, June, July, August

Lighting Conditions: Full Sun, Partial Sun

Soil Type: Sand, Loam

Soil Acidity: Alkaline, Neutral, Acid

Moisture: Well-drained

Germination Instructions

Sow indoors. Sow 10mm deep into moist well-drained seed compost. Propagate at 15-20°C. Normally germinates in the dark. Germination takes 21-28 days. Transplant seedlings once large enough to handle to 8cm pots. Over winter under glass. Plant out following spring. Can sow direct into prepared , raked soil 3mm deep in drills 30cm apart. Thin to 15cm spacing when large enough to handle.

Growing Instructions

Fertilise monthly, water infrequently.

Cultivation Instructions

 Deadhead regularly to extend the flowering period. Once established the plant likes being divided outside of the flowering season.

When to Sow

• Sow Under Cover/Plant Indoors
• Direct Sow/Plant Outdoors
• Flowers/Harvest

Approximate number of seeds per packet: 60

Please note we pack the majority of our seeds by volume so the number of seeds indicated is only an approximation.