Perennial cornflower

The most popular Centaurea - and for a good reason!
Common name : Perennial cornflower
Scientific name : Centaurea montana
Family : Asteraceae
Category : Perennials
Type of plant : Perennial
Centaurea montana - the perennial cornflower - is a species of Centaurea endemic to Europe, and popular as a garden subject - as it is fairly easy to grow. It does escape from gardens readily, and has thereby become established in the wild in the British Isles, Scandinavia and North America. Found in meadows and open woodland in the upper montane and sub-alpine zones, it grows to 12–28 in (30–70 cm) tall, and flowers mainly from May to August. C. montana can be distinguished from other Centaurea species by its usually entire leaves, and the blue-purple colour of the outermost ray florets. It may be distinguished from the cornflower, C. cyanus, by having a single (rarely up to three) flower heads, and by its being perennial, whereas the cornflower is an annual.

Sowing & planting

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Flowering

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Caracteristics

Exposition
Water needs
Granulométrie plants.granulometry_4
Frost-resistance High
Zone USDA 5b
Height 20 - 60
pH 5.9 - 7

Plant my perennial cornflower

Plant your perennial cornflowers in the spring or fall, in rich and moist soil, in the shade or in the sun - possibly half-shade in a very sunny climate.

Water my perennial cornflower

Perennial cornflowers do not require water : if it's planted in open soil, it is not necessary. If in pot or planters, it will however be necessary to water regularly in summer in case of dry and hot weather.

Fertilize my perennial cornflower

Fertilize before winter (while mulching for example), moderately decomposed compost or manure, and by a light scratching to incorporate. In this way, your intake will have time to decompose itself and will be available in the spring when the plant is restarted.

Mulch my perennial cornflower

Mulching these perennials will save you from watering and weeding and will even fertilize the soil a bit as it decomposes. When choosing, know that dry wood chips are the most inert, but they will last for a longer time. Fresh wood chips and leaves enrich the soil but must be changed often. Grass cuttings are to be used mixed with something else in a layer that is at most 1 cm thick. Mulch with a thickness of at least 5 cm to provide a good level of efficiency.

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