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Geranium ‘Johnson’s Blue’ is a popular and beloved hardy perennial known for its beautiful, long-lasting blooms and easy care. Not to be confused with the more commonly known annual geraniums (Pelargonium), this hardy geranium belongs to the genus Geranium, often referred to as cranesbills due to the shape of their seed pods. ‘Johnson’s Blue’ is particularly cherished for its large, vivid blue flowers and attractive foliage, making it a staple in many garden designs.
Characteristics of Geranium ‘Johnson’s Blue’
Appearance
Geranium ‘Johnson’s Blue’ is celebrated for its striking, cup-shaped flowers that are a true blue with a hint of lavender. Each flower measures about 2 inches (5 cm) in diameter and features five petals with delicate, darker veins that add depth and texture to the blooms. These flowers are held on slender, branching stems above mounds of deeply cut, lobed leaves that provide a soft, feathery backdrop. The foliage is medium to dark green and turns a beautiful shade of orange or red in the fall, adding another layer of seasonal interest to the garden.
Growth Habit
This geranium forms a low-growing, spreading mound that typically reaches about 12-18 inches (30-45 cm) in height and spreads to about 24-30 inches (60-75 cm). Its dense, clump-forming habit makes it an excellent ground cover, particularly for filling in spaces between other plants or spilling over the edges of garden beds and borders. ‘Johnson’s Blue’ has a somewhat sprawling nature, allowing it to weave gently among neighboring plants, creating a naturalistic and informal appearance.
Blooming Season
Geranium ‘Johnson’s Blue’ blooms profusely from late spring to early summer, typically from May to July, depending on the climate. The flowers appear in waves, often with a second, lighter flush later in the summer if conditions are favorable and the plants are well-maintained. Deadheading spent blooms can encourage this secondary blooming period and keep the plant looking tidy throughout the growing season.
How to Grow and Care for Geranium ‘Johnson’s Blue’
Light Requirements
Geranium ‘Johnson’s Blue’ thrives in full sun to partial shade. In cooler climates, it performs best in full sun, which helps produce abundant blooms and keeps the plant compact. In warmer regions, providing some afternoon shade can help protect the delicate flowers and foliage from the intense heat and prevent leaf scorch.
Soil
This hardy geranium prefers well-draining, moderately fertile soil with a slightly acidic to neutral pH (around 6.0 to 7.0). While it is adaptable to various soil types, including sandy, loamy, and clay soils, good drainage is essential to prevent root rot and other moisture-related issues. Adding organic matter such as compost or leaf mold can improve soil structure and fertility, providing a healthier environment for the roots.
Watering
Geranium ‘Johnson’s Blue’ prefers consistent moisture, especially during its active growing and blooming period in late spring and early summer. Water regularly to keep the soil evenly moist but not waterlogged. Once established, this geranium is relatively drought-tolerant, although it will perform best with regular watering, particularly during dry spells. Mulching around the base of the plant can help retain moisture and regulate soil temperature.
Fertilizing
Geranium ‘Johnson’s Blue’ does not require heavy fertilization to thrive. A light application of a balanced, slow-release fertilizer in early spring can help support healthy growth and flowering. Avoid over-fertilizing, as this can lead to excessive leaf growth at the expense of flowers. An annual top dressing of compost in the spring can provide additional nutrients and improve soil health without the risk of overfeeding.
Pruning and Maintenance
Deadheading spent flowers will encourage a tidier appearance and may promote a second flush of blooms later in the season. In late summer, after the main flowering period has ended, cutting back the foliage by about half can help rejuvenate the plant and encourage fresh growth for the fall. This practice can also help prevent the plant from becoming too leggy or sprawling.
Pest and Disease Management
Geranium ‘Johnson’s Blue’ is generally pest-resistant and not prone to serious diseases, making it an excellent choice for low-maintenance gardens. Occasionally, it may be affected by common garden pests such as aphids or slugs. If pests become a problem, treat them with insecticidal soap or use organic slug bait as needed. Ensuring good air circulation around the plant and proper spacing can help prevent fungal diseases such as powdery mildew.
Landscaping Uses for Geranium ‘Johnson’s Blue’
Cottage Gardens and Borders
The loose, informal habit and vibrant blue flowers of Geranium ‘Johnson’s Blue’ make it a perfect fit for cottage gardens and mixed borders. It pairs beautifully with other perennials such as roses, peonies, delphiniums, and foxgloves, providing a lush, romantic feel. The blue flowers contrast well with warmer-colored blooms, creating a harmonious and balanced palette.
Ground Cover and Edging
‘Johnson’s Blue’ is an excellent choice for use as a ground cover in larger garden beds or along garden paths. Its spreading nature allows it to fill in gaps between taller plants, creating a cohesive and layered look. Planting it along the edge of a border or walkway provides a soft, flowing edge that helps define garden spaces and creates a sense of movement.
Containers and Rock Gardens
While typically grown in garden beds, Geranium ‘Johnson’s Blue’ can also thrive in containers, where its compact growth and prolific blooming can be appreciated up close. Plant it in a pot with well-draining soil, and combine it with other sun-loving perennials or annuals for a colorful display. It also works well in rock gardens, where its ability to spread and fill gaps can soften the appearance of stones and provide a pop of color.
Historical Anecdote: The Discovery of Geranium ‘Johnson’s Blue’
Geranium ‘Johnson’s Blue’ has an interesting history, dating back to its discovery in the mid-20th century. It is believed to be a hybrid between Geranium himalayense and Geranium pratense, combining the best traits of both species to create a plant with exceptional vigor, hardiness, and floral display. Named after the English gardener and plant enthusiast A.T. Johnson, who introduced it to the horticultural world, ‘Johnson’s Blue’ quickly gained popularity for its vibrant color and reliable performance.
In the decades since its introduction, Geranium ‘Johnson’s Blue’ has become a staple in gardens worldwide, valued for its long-lasting blooms, attractive foliage, and adaptability to various garden settings. Its legacy continues today as one of the most cherished hardy geraniums, bringing beauty and joy to gardeners and garden visitors alike.
Geranium ‘Johnson’s Blue’ is a versatile and resilient perennial that deserves a place in any garden. Whether used as a ground cover, a border plant, or a container specimen, its charming blue flowers and easy-care nature make it a garden classic that can be enjoyed for years to come. With proper care and attention, ‘Johnson’s Blue’ will reward you with a stunning floral display and add a touch of elegance to your garden space.