Geum coccineum aka Scarlet Avens

Geum coccineum forms a compact clump of basal foliage about 15cm high, with flowering stems rising to 30-45cm tall. The plant spreads to approximately 25-40cm wide. It has a moderate growth rate, reaching mature size in 2-5 years. The clump-forming habit makes it suitable for front-of-border positions and rock gardens.

Geum coccineum is native to the mountain regions of southeastern Europe and northern Turkey. It grows naturally at elevations of 900-2400m in the Balkan Mountains, Rhodopes, Pirin, Rila, Vitosha, and other ranges across Bulgaria, Serbia, North Macedonia, Albania, Montenegro, and northern Greece. In Turkey, it occurs in the Pontic Mountains. Its natural habitat includes wet, marshy meadows and areas along mountain streams.

Geum coccineum is extremely cold-hardy, rated H7 by the RHS, meaning it can survive temperatures below -20°C. It thrives in cool summer climates and struggles in hot, humid conditions. The foliage is evergreen except where winter temperatures drop below -18°C (0°F). In areas with hot summers, provide afternoon shade to prevent heat stress.

Geum coccineum has modest fertilizer needs. Avoid over-fertilizing, which can lead to lush foliage at the expense of flowers.

Division is the most reliable propagation method and should be done every 3 years to maintain plant vigor. Divide in early spring or late summer by lifting the clump and separating it into sections with a sharp spade. Seeds can be sown in pots in a cold frame during winter and will germinate in 21-30 days at 20°C, though cultivars won't come true from seed. Geums also spread slowly via rhizomes, and side shoots can be dug up and replanted.

Geum coccineum produces striking saucer-shaped flowers from late spring through summer, with peak bloom from May to July. Each flower is 2.5-4cm across with five brick-red to scarlet-orange petals surrounding a prominent cluster of yellow stamens. Blooms are carried in loose cymes on wiry, branching stems above the foliage. Deadheading spent flowers encourages additional blooms and can extend flowering into autumn. After flowering, attractive fluffy seed heads develop.

Several excellent cultivars have been developed from Geum coccineum. 'Cooky' and 'Koi' are compact varieties with vibrant orange flowers ideal for smaller gardens. 'Eos' features salmon-orange blooms. 'Werner Arends' produces semi-double orange-red flowers. 'Queen of Orange' offers particularly intense orange coloring. 'Feuermeer' (Fire Sea) and 'Tosai' are also available. All cultivars share the species' preference for cool, moist conditions and benefit from regular division.

Geum coccineum is a hardy outdoor perennial rated for USDA zones 5-7 and RHS hardiness H7. It thrives outdoors in temperate climates with cool summers but struggles south of zone 7 due to heat and humidity. The plant is evergreen in milder areas but may die back where winters drop below -18°C. It's not suited for hot, humid climates or areas with waterlogged winter soils. In hot regions, provide afternoon shade and ensure excellent drainage.

Regular deadheading is the main pruning task for Geum coccineum. Remove spent flower stems as blooms fade to encourage additional flowers and extend the flowering season. In late autumn or early spring, cut back any dead or damaged foliage. The RHS recommends removing spent flower stems completely after the flowering period. Division every 3 years is also important—plants that aren't divided become woody and may decline.

Geum coccineum is generally trouble-free, with deer and slugs largely ignoring it. The main pest is geum sawfly, whose larvae feed on foliage from late May to June, potentially causing extensive damage. Monitor plants in spring and remove larvae by hand. Powdery mildew can occur in humid conditions or shaded areas, appearing as white powdery patches on leaves. Container-grown plants may be susceptible to vine weevil. Good air circulation and avoiding waterlogging help prevent disease.

Geum coccineum is pollinated by insects, particularly bees and butterflies. The bright orange-red flowers with prominent yellow stamens are highly attractive to pollinators, making it an excellent choice for wildlife-friendly gardens. After pollination, the plant produces achenes (small dry fruits) with hooked bristles that attach to animal fur and feathers, enabling seed dispersal across varied terrain. Butterfly larvae, including the Grizzled Skipper, also feed on the foliage.

In spring, divide congested clumps and apply a light topdressing of compost. Through summer, maintain consistent moisture and deadhead spent flowers to prolong blooming. Water regularly during dry spells as the plant doesn't tolerate drought. In autumn, allow the last flowers to set seed if desired, or remove spent stems. Before winter, ensure good drainage as wet, poorly-drained soil in winter can be fatal. In mild climates, foliage remains evergreen; in colder areas, it may die back but will regrow in spring.

If you're looking for a plant that offers a moderate level of challenge, Scarlet Avens is a great choice to test your gardening skills.

Scarlet Avens should be watered regularly, allowing the soil to dry out between waterings.

Scarlet Avens loves a well-draining soil. Perlite and vermiculite help with drainage, while coco coir adds organic matter, so a good potting soil mix will have all three. You can improve store-bought soil by adding some perlite to it.

To ensure optimal growth, the Scarlet Avens prefers bright indirect light for 6-8 hours each day. Insufficient light can result in slow growth and leaf drop, so it's important to find a well-lit location for this plant. Place it near a window, within a distance of 1 meter (3 feet), to enhance its potential for thriving.

Scarlet Avens is not known to cause harm to humans or pets.