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Geum

Geum, also known as avens, is a charming and versatile perennial that belongs to the rose family. With its vibrant blooms in shades of red, orange, yellow, and white, geum adds a touch of whimsy and color to any garden. This comprehensive guide will provide gardeners with all the essential information they need to successfully cultivate and enjoy geum in their landscapes.

What Makes Geum So Special? Geum is a beloved perennial for several reasons:

  • Long blooming season: Geum typically blooms from late spring to early summer, with some varieties continuing to flower throughout the summer and into fall.
  • Variety of colors and forms: Geum flowers come in a wide range of colors, including shades of red, orange, yellow, pink, and white. The flowers can be single, semi-double, or double, and they are often cup-shaped or nodding.
  • Attractive foliage: Geum has attractive foliage that forms a basal rosette at the ground. The leaves are often divided and can be evergreen or deciduous, depending on the species and climate.
  • Pollinator-friendly: Geum flowers are attractive to pollinators such as bees and butterflies.
  • Low maintenance: Geum is relatively easy to care for and is generally pest and disease resistant.
  • Versatile: Geum can be used in a variety of garden settings, including borders, rock gardens, containers, and as a ground cover.
  • Deer and rabbit resistant: Geum is not a favored food source for deer and rabbits, making it a good choice for gardens where these animals are a problem.
  • Low-allergen plant: Geum is a low-allergen plant, making it a suitable choice for gardeners with sensitivities.

Description and Details Geum is a genus of about 50 species of rhizomatous perennial herbaceous plants. The genus name comes from the Latin word for "scarlet." Geum plants typically grow 9-18 inches tall in a mounding habit. The flowers have five or more petals and bloom in midsummer on wiry stalks that rise above the foliage.

The botanical interpretation and origin of the two key species from which many of the best-known Geum varieties are grown today is complex. G. chiloense originates in Chile and G. coccineum in Greece and the Adriatic coast. In the nursery trade, you are more likely to find hybrids rather than the true species plants, but they are largely selections and crosses based on the following three species: native Ohio geum (Geum rivale), Chilean geum (Geum chiloense), and European geum (Geum coccineum).

There are three different groups of Geum cultivars: rivale, coccineum, and chiloense. The rivale cultivars have nodding, bell-like flowers and prefer moist, shady conditions. Coccineum cultivars are alpine plants that flower well after a cold winter and have upward-facing flowers. The chiloense cultivars are tall, sturdy plants that produce large double flowers and can tolerate full sun as well as semi-shade.

One popular rivale cultivar is 'Coppertone', which features evergreen foliage topped by apricot, nodding flowers.

A unique characteristic of the Geum genus is the presence of a double kink in the style of most species. This distinctive feature sets Geum apart from other plants.

Another interesting feature of Geum is the presence of "nectar guides" on the flowers. These are black spots visible under ultraviolet light that guide pollinators to the nectar.

Native Habitat Geum is native to temperate regions of Europe, Asia, North and South America, Africa, and New Zealand. It can be found in a variety of habitats, including woodlands, meadows, and stream banks. For example, Geum macrophyllum is commonly found along wet meadows and streambanks in western mountains. Geum urbanum has been encountered in Massachusetts, Rhode Island, and Vermont in forest edges, forests, swamps, and wetland margins.

Landscaping Design Tips Geum is a versatile plant that can be used in a variety of garden settings. Here are some design tips for using geum in your landscape:

  • Borders and Ground Covers: Geum is excellent for adding color and texture to borders. Plant them in drifts or groups for a more impactful display. Some geum varieties, such as Geranium 'Ann Folkard' and Geranium 'Brookside', can be used as ground covers.
  • Rock Gardens: Geums can thrive in rock gardens as long as the soil is not too dry.
  • Cut Flowers: Geums make lovely cut flowers with their graceful stems and long-lasting blooms.
  • Containers: Geums can be grown in containers, adding a touch of charm to patios and balconies.

When choosing geum varieties and cultivars, consider factors such as flower color, plant height, and blooming season to ensure they complement the overall garden design. Consider the different growth habits of Geum varieties (upright, trailing) and how this influences their use in landscaping. For example, the sterile variety 'Totally Tangerine' and the sun-scorch resistant 'Starkers Magnificum' are good choices for sunny locations.

Planting and Care

  • Soil Preparation Geum thrives in well-drained, fertile soils. It may be short-lived in clay or soils that are persistently wet through the winter. Incorporating plenty of compost during planting will help soils retain moisture without becoming compacted and heavy.
  • Planting Depth and Spacing When planting, space the young plants about 12 inches apart to allow for their spreading growth habit.
  • Watering In the weeks after planting, water thoroughly to help it get established. Continual moisture is required to keep geum looking its very best, especially in hot or dry climates.
  • Fertilizing Geums are not heavy feeders. A healthy dose of compost prior to planting will provide most, if not all, of the nutrients that this plant needs. If your soil is particularly poor, apply a balanced, slow-release fertilizer once during the growing season. Overfertilizing with a nitrogen-heavy amendment may lead to more foliage growth with fewer flowers.
  • Pruning Deadhead non-sterile cultivars after flowering to help prolong their bloom period. Prune back flowering stems once the plant finishes blooming.

Care Geum plants are generally low-maintenance. They require regular watering, especially during dry periods, but overwatering should be avoided to prevent root rot. Deadheading spent flowers can promote additional blooms and keep the plant tidy. In colder climates, providing a layer of mulch around the base can protect the plant during winter. Geum can die if exposed to wet winter soils. Geum prefers cool to moderate climates and is sensitive to heat.

When growing Geum from seed, the ideal temperature for seedlings is 60-70°F (15°C to 21°C). Geum seedlings require bright, indirect light to thrive.

  • Propagation Geum can be propagated from seed or by division.
  • Seed Propagation: Geum seeds can benefit from 4-6 weeks of cold stratification prior to planting. Seeds can be sown directly in the garden in the fall or started indoors in February for a late May plant-out time.
  • Division: It is best to divide geums in early spring or fall.

Uses Beyond the Garden Geum has some uses beyond the garden. A tincture of avens is an ingredient in some herbal medicines as a mild sedative.

Other Insights for Gardeners

  • Divide overgrown plants: Divide in spring or fall to rejuvenate overgrown plants.
  • Deadhead to extend bloom time: Remove spent flower stems promptly to extend the bloom period.
  • Fertilize lightly: Fertilize established Geum lightly once annually with a granular fertilizer in early spring.
  • Enjoy the seed heads: Leave a few spent blooms on as seed heads are attractive fluffy plumes. These fluffy seed heads also play a role in seed dispersal.
  • Be mindful of potential problems: Root rot can be a problem in poorly drained soils, particularly in winter. Geum may be short-lived in heavy clay soil or hot summer climates.

Geum Species and Cultivars

Species/Cultivar

Flower Color

Height

Bloom Time

Special Features

Geum rivale 'Coppertone'

Apricot

12"

April to June

Evergreen foliage, nodding flowers

Geum chiloense 'Mrs. Bradshaw'

Scarlet

9-12"

May to June

Semi-double flowers

Geum 'Totally Tangerine'

Orange

24-36"

Early summer

Sterile variety, long blooming season

Geum 'Flames of Passion'

Deep reddish-pink

6-18"

Late spring

Semi-double flowers, compact habit

Geum 'Lady Stratheden'

Yellow

12-20"

May to September

Semi-double flowers

Geum is a rewarding perennial that offers a long blooming season, a variety of colors and forms, and attractive foliage. With its low-maintenance nature and versatility, geum is a great choice for gardeners of all levels of experience. By following the planting and care instructions outlined in this guide, you can ensure that your geum plants thrive and bring beauty to your garden for years to come.

Geum's unique double kink in the style and its "nectar guides" make it a fascinating plant for both its beauty and its botanical features. The fluffy seed heads add visual interest and play a role in seed dispersal. Whether you are looking to add a splash of color to your borders, create a charming ground cover, or enjoy the delicate beauty of cut flowers, geum is a versatile and rewarding choice for any garden. Why not try growing this charming perennial in your own garden and experience the joy it brings?