Agrimonia procera aka Scented Agrimony

Agrimonia procera is an easy, low-maintenance plant for outdoor gardens. It is undemanding about soil type, tolerates both dry and moderately moist conditions, and self-sows freely once established in a suitable position. No special expertise is required.

Agrimonia procera grows to approximately 1 metre (3 ft) tall. Spread for the closely related A. eupatoria is around 0.5 m (1 ft 8 in); A. procera is described as bushier and more leafy, likely with a similar or slightly wider spread. Growth rate is medium.

Agrimonia procera is native to Europe, occurring from England and western France across to central Europe. It has a remarkable disjunct population in South Africa with no intermediate range. Within Europe it is confined to lowland areas, rarely exceeding 335 m elevation. It grows in woodland margins, hedgerows, scrub, road verges, and tall grassland.

Agrimonia procera grows in circumneutral to slightly alkaline soils, with a preference for calcareous (lime-rich) conditions. It tolerates light (sandy), medium (loamy), and heavy (clay) textures. It favours moist to moderately dry conditions and is found naturally in mesophilic (moderately moist) herb margins and forest edges.

Agrimonia procera is a hardy European perennial that withstands cold winters. It is confined to lowland habitats in Europe and is present across temperate climates. In Switzerland it is considered Vulnerable nationally and Critically Endangered in the southern Alps, partly due to climate sensitivity. It does not require frost protection in temperate gardens.

Agrimonia procera grows naturally in woodland margins and hedgerows in temperate European climates with moderate ambient humidity. It tolerates both drier and moderately moist conditions and does not require elevated humidity.

No specific fertilizer requirements are documented for Agrimonia procera. As a low-maintenance wildflower, it thrives without supplemental feeding in circumneutral to alkaline garden soils.

Agrimonia procera flowers from late July through August in the British Isles (June–August across its European range). Seeds ripen in late summer to autumn and are dispersed by hooking onto passing animals and clothing. Plants die back to the rootstock in winter. Division can be carried out in autumn; seeds sown in autumn or spring.

Agrimonia procera has a distinctive sweet fragrance produced by yellow glandular hairs on the undersides of its leaves. The scent is released when the leaves are handled or brushed. This fragrance is noticeably stronger than that of common agrimony (A. eupatoria) and gives the species its common names: Scented Agrimony and Fragrant Agrimony.

The flowers of Agrimonia procera are small, yellow, and five-petalled, with 5–20 stamens. They are arranged in long, slender terminal racemes on upright stems. In the British Isles, blooming typically begins in late July and extends through August, making it a later-flowering species than common agrimony. The chromosome number is 2n = 56.

No named cultivated varieties or subspecies of Agrimonia procera are documented. It is most reliably distinguished from common agrimony (A. eupatoria) by its stronger scent, longer glandular stem hairs, more deeply serrated leaflets bearing more glands, and hooked fruit bristles that partially point back toward the stalk rather than downward.

Agrimonia procera is exclusively an outdoor plant. It is well suited to wildflower meadows, cottage gardens, woodland edges, and hedgerows in temperate climates. It prefers full sun to light shade and circumneutral to alkaline soils. It self-sows readily, making it easy to naturalise. It is not suitable as a houseplant.

No specific pruning requirements are documented for Agrimonia procera. Cutting back old stems after seed set can prevent excessive self-seeding. Plants die back naturally in winter and re-emerge from the rootstock in spring.

Agrimonia procera is not typically grown as a container or houseplant and does not require repotting. It is best established directly in garden soil.

No specific cleaning requirements are documented for Agrimonia procera.

Agrimonia procera can be propagated by seed or by division. Seeds can be sown in spring or autumn; at 13°C they germinate within 2–6 weeks. Division of the rootstock is best carried out in autumn. The plant also self-sows freely in suitable positions, so natural spread within a garden is common.

No specific causes of yellowing leaves are documented for Agrimonia procera. General causes in the genus would include waterlogged soil, nutrient-poor growing conditions, or natural senescence in late summer.

No specific causes of browning leaves are documented for Agrimonia procera. Brown leaf edges may result from drought stress; the plant tolerates moderately dry conditions but prolonged drought can cause leaf scorch.

No specific drooping issues are documented for Agrimonia procera. Wilting is most likely caused by drought stress or waterlogged, poorly draining soil.

As a herbaceous perennial, Agrimonia procera naturally loses all above-ground growth in autumn and winter, dying back to the rootstock and re-emerging in spring. This is normal seasonal behaviour, not a sign of disease.

Agrimonia procera has a medium growth rate. Slow establishment may result from insufficient sunlight (it prefers full sun), acidic soil (it favours neutral to alkaline conditions), or excessively wet or nutrient-poor ground.

The only insect pest specifically documented on Agrimonia procera is the aphid Acyrthosiphon malvae. No significant disease problems are recorded. The plant is generally robust and trouble-free in appropriate growing conditions.

Agrimonia procera has limited documented insect interactions. Seed dispersal is primarily achieved by epizoochory: the double ring of hooked bristles on the fruits clings to the fur of animals or clothing of people, carrying seeds away from the parent plant.

Leaves, flowers, and stems of agrimony species are used to make herbal teas and infusions, valued for their slightly bitter, astringent taste. Seeds can be ground into meal. Large quantities may cause digestive discomfort due to high tannin content. Use during pregnancy and lactation is not recommended. Note that these uses are documented primarily for the genus Agrimonia and A. eupatoria specifically; no direct edibility studies on A. procera are available.

Agrimony has a long history of herbal use. Active compounds in Agrimonia include agrimoniin (a tannin) and flavonoids, which show anti-inflammatory activity in laboratory studies on cells and experimental animals. Traditional uses include treatment for digestive complaints, liver conditions, and historically snake bites (Celsus, 1st century AD). Modern clinical evidence for efficacy in humans remains limited. High tannin content means large doses may cause constipation; contraindicated in pregnancy and lactation.

Agrimonia procera is used to make herbal teas and infusions. Its hooked fruits are adapted for dispersal by animals and have no documented additional use. The plant is palatable to livestock. In herbal traditions the plant has been used in flavouring preparations due to its pleasant scent and slightly bitter taste.