Chalk milkwort (Polygala calcarea)

Chalk milkwort

Chalk milkwort forms delicate, pea-shaped blooms in a striking shade of blue, making it a lovely plant to come across. The plant's common name Chalk milkwort and calccarea in its Latin name (meaning 'growing in lime') both allude to chalk milkwort's favoured soil types.

Scientific classification

Species

Chalk milkwort (Polygala calcarea)

Legumes, milkworts and allies

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Perennial

Lifespan

Herb

Plant Type

Spring

Bloom Time

5 cm

Plant Height

Purple, Blue

Flower Color

Semi-evergreen

Leaf type

20 - 35 ℃

Ideal Temperature

Distribution of Chalk milkwort

Distribution Map

Chalk milkwort is native to Central and Southern European limestone regions. Its growth is predominantly found in areas characterized by calcareous soil, reflecting its adaptability to specific geological substrates. Over time, chalk milkwort has maintained a presence within its native range, and there is no significant record of it being introduced to disparate regions on a global scale.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Alpine garden

Care Guide for Chalk milkwort

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Water: Chalk milkwort originates from rocky, calcareous regions, tolerating moderate moisture and brief droughts. Weekly watering is recommended for optimal hydration. It thrives outdoors, benefiting from natural rainfall, making it suitable for rock gardens or environments that mimic its native conditions.

Fertilize: Chalk milkwort thrives with balanced fertilizers during the growing season, particularly a high-phosphorus formula pre-bloom. Bi-monthly, diluted quarter-strength applications are ideal, with reduced frequency in winter. Watering chalk milkwort before fertilization protects roots, promoting a lush, vibrant display.

Pruning: Chalk milkwort thrives with early to late spring pruning, removing spent blooms and overgrowth to boost new growth and flowering. Eliminating dead or damaged stems supports overall health, promotes a bushier form, and enhances its ornamental appeal in gardens.

Propagation: Chalk milkwort thrives when propagated by sowing in well-draining soil. Spread seeds on the surface and lightly press them into moist soil, ensuring they remain uncovered for light exposure. Maintain consistent moisture until seedlings are established and ready for transplanting.

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