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Scarlet Pimpernel

Lysimachia arvensis

Also listed as Anagallis arvensis, Anagallis phoenicea

Also known as Common Scarlet Pimpernel, Poor Man's Weather Glass, Shepherd's Calendar

groundcover☀️ full sun💧 low water❄ Hardy: Zone 5b – Zone 11b

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A low-growing annual wildflower with bright scarlet-red flowers that close in cloudy weather. It spreads quickly to cover bare soil and is excellent for cottage gardens and naturalized areas.

Why grow it

Scarlet pimpernel establishes quickly on disturbed or bare ground where slower perennials haven't yet filled in, making it useful for temporary cover in newly prepared beds. Its low stature and fine texture offer a visual contrast to coarser companion plants common in cottage and meadow gardens. Unlike many ornamental annuals, it tolerates poor soil and requires minimal inputs once established.

Watch out for

This species self-seeds readily and can persist year to year in favorable conditions, so deadheading or removal may be necessary if spread beyond intended areas is a concern. Performance varies considerably by region and microclimate, so trial patches in your specific growing zone are advisable before committing larger areas to it.

Overview

Form
Spreading
Growth Rate
fast
Size
0.25–0.5′ tall × 0.5–1.5′ wide
Dormancy
deciduous
Family
Primulaceae

Native Range

Europe

Seasonality

Bloom Season

J
F
M
A
M
J
J
A
S
O
N
D

Season of Interest

Summer

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Companion Planting

Plants well with