Geranium Rozanne (Cranesbill)

Geranium ‘Rozanne’ – Long Blooming Hardy Geranium For Beds, Borders, And Containers

If you want a hardy perennial geranium that flowers for months, weaves beautifully through your borders, and asks for very little in return, Geranium ‘Rozanne’ is hard to beat. This outstanding cranesbill produces a generous flush of large violet blue flowers with glowing white centers from late spring right through to the first fall frosts.

Despite its elegant, almost delicate looking blooms, Rozanne geranium is tough, vigorous, and easy going. Give it full sun to partial shade, moist but well drained soil, moderate watering, and a simple cut back once a year, and it will reward you with a carpet of blue that flows through beds, borders, and even containers. It is one of the most loved hardy geraniums in the world for good reason.

Quick Facts – Geranium ‘Rozanne’

Summary: Robust, clump forming herbaceous perennial geranium with spreading stems, marbled green foliage, and a near continuous display of large violet blue flowers with white eyes from late spring to frost.
Use: Perennial borders, front of beds, ground cover, underplanting for shrubs and roses, cottage gardens, rock gardens, containers, and pollinator friendly plantings.
Highlight: Exceptionally long flowering season, cool blue blooms that mix effortlessly with many color schemes, and strong attraction for bees and butterflies, while remaining deer and rabbit resistant.
Note: Easy to grow, heat tolerant, and low maintenance, ideal for gardeners who want reliable summer color with minimal fuss.

Botanical Name	Geranium ‘Rozanne’
Family	Member of the Geranium (cranesbill) genus in the Geraniaceae family, which also includes ornamental Pelargonium (bedding geranium) cousins.
Common Names	Geranium Rozanne, Rozanne geranium, Rozanne cranesbill, hardy geranium Rozanne, perennial geranium Rozanne
Native Range	Hybrid cultivar discovered in a garden in Somerset, England. It does not occur in the wild, but its parent species are native to parts of Europe and Asia and are widely grown in gardens worldwide.
Plant Type and Habit	Herbaceous perennial with a spreading, mounding habit. Stems trail gently and knit together into a dense, weed suppressing mat.
Hardiness (approx. USDA)	USDA Zones 5 to 8 in average conditions, often succeeding in slightly colder or warmer microclimates with good drainage and winter protection.
Size	Typically about 18 to 20 in. tall (45 to 50 cm) and 24 to 36 in. wide (60 to 90 cm), forming a billowing mound that flows attractively around companions.
Sun and Exposure	Full sun to partial shade. In cooler climates, more sun encourages maximum bloom. In hotter regions, light afternoon shade helps protect foliage and flower color.
Soil	Prefers moist, well drained, moderately fertile soil. Adapts to many garden soils if drainage is good and extremes of dryness or waterlogging are avoided.
Seasonal Interest	Violet blue, saucer shaped flowers with white centers from late spring through fall, plus marbled green foliage that turns red or bronze in cool autumn weather.
Primary Uses	Borders, front of beds, ground cover, spilling over walls, underplanting for roses and shrubs, rock gardens, cottage gardens, containers, and pollinator plantings.

Care – Quick

• Planting: Plant in spring or early fall in sun to light shade, using well prepared, well drained soil enriched with organic matter.
• Water: Water regularly the first season to establish roots. Once established, Geranium Rozanne is moderately drought tolerant, especially in cooler climates or when paired with other low water perennials.
• Feeding: Feed lightly in spring with a balanced, slow release fertilizer or a topdressing of compost. Overfeeding encourages leafy growth at the expense of flowers.
• Pruning: Lightly shear or deadhead to tidy. A hard cut back in mid to late summer often produces a fresh flush of foliage and flowers.
• Propagation: Propagate reliably by division in early spring or fall once clumps are established.
• Wildlife: Flowers draw bees and butterflies, while the aromatic foliage is generally ignored by deer and rabbits.

What Is Geranium ‘Rozanne’?

Description

Geranium ‘Rozanne’ is a vigorous, long blooming hardy geranium that has become a modern classic. It forms a mound of gently trailing stems clothed in deeply cut, slightly marbled green leaves. From early summer, those stems are studded with large, saucer shaped flowers up to about 2 in. wide (5 cm).

Each bloom is a rich violet blue with a bright white center and delicate purple veining. The flowers are held just above the foliage, creating a relaxed, meadowy effect that works beautifully in informal, natural style plantings as well as more traditional borders.

Geranium ‘Rozanne’ is the recipient of the Award of Garden Merit of the Royal Horticultural Society for its noteworthy qualities.

Native Range

Rozanne is a cultivar, not a naturally occurring species. It was discovered in a private garden in Somerset, England, and later introduced worldwide. Its parentage traces back to species in the Geranium (cranesbill) genus, a group of perennials and subshrubs native mainly to temperate regions of Europe and Asia.

Because it is a selected hybrid, Rozanne combines the best traits of its parents: strong vigor, generous flowering, and a graceful, ground hugging habit that makes it easy to blend into almost any planting scheme.

Growth Habit and Vigor

Plant Type and Habit: Geranium Rozanne is a herbaceous perennial with a sprawling, spreading habit. Rather than growing tall and stiff, it knits itself through neighboring plants, softening edges and covering bare soil.

It usually grows 18 to 20 in. tall (45 to 50 cm) and 24 to 36 in. wide (60 to 90 cm). The stems are flexible and gently arching, so the plant tumbles nicely over path edges, low walls, and the rims of containers without overwhelming nearby companions.

Flowers and Bloom Time

The biggest reason gardeners fall in love with Rozanne is its incredibly long flowering season. While many hardy geraniums bloom in a strong flush and then rest, Rozanne just keeps going.

Expect nonstop flowering from late spring or early summer right into fall, often until the first frost. The violet blue flowers with white centers show up well from a distance and weave a cool ribbon of color through warmer reds, oranges, and yellows.

Foliage and Seasonal Interest

The foliage of Geranium Rozanne is attractive in its own right. The leaves are deeply divided, slightly marbled with deep green and chartreuse tones, and create a soft, textural mound that fills space even when the plant is not in peak bloom.

As temperatures cool in fall, the foliage often takes on reddish or bronze tints, adding one more season of interest before the plant dies back for winter.

Hardiness

Hardiness: Geranium Rozanne is generally hardy in USDA Zones 5 to 8. In these zones it will die back to the ground in winter and reemerge reliably each spring, often larger and showier than the year before.

In very cold climates, a protective mulch and well drained soil help the crowns survive freeze thaw cycles. In hot summer regions, some afternoon shade and consistent moisture help Rozanne stay lush and blooming.

Landscape Uses

You can tuck Rozanne into many parts of the garden:

• Perennial borders: Use along the front or middle of borders to create a flowing carpet of blue between taller perennials and shrubs.
• Ground cover: Plant in drifts to cover bare soil around roses, small trees, or shrubs. Its spreading habit naturally suppresses many weeds.
• Rock and gravel gardens: Let Rozanne spill over stones and soften hard edges.
• Containers: Grow in pots and mixed planters where the stems can trail gently over the sides.
• Mixed cottage plantings: Combine with classic favorites like lavender, salvia, Shasta daisies, and ornamental grasses for a relaxed, romantic look.

Wildlife and Ecological Value

Pollinators: The open, saucer shaped flowers of Geranium Rozanne are rich in nectar and pollen, making them very attractive to bees and butterflies. Planting Rozanne in drifts or repeated groups creates a pollinator friendly corridor that is beautiful and beneficial.

Deer and Rabbits

Deer and Rabbits: Thanks to its slightly aromatic foliage, Geranium Rozanne is usually left alone by browsing animals. It is generally considered resistant to deer and rabbits, though no plant is completely safe if food is scarce.

Drought Tolerance

Drought Tolerance: While Rozanne appreciates regular moisture, it is reasonably drought tolerant once established, especially in cooler regions and in partial shade. It will look its best and flower longest with consistent watering that keeps soil lightly moist but not saturated.

In very dry gardens, pair it with deeper rooted perennials such as salvias recommended in Top Salvia Varieties for a Thriving Xeriscape to create a resilient, pollinator friendly planting.

Toxicity

Toxicity: Geranium Rozanne is not known to be toxic to humans or pets. This makes it a safe choice for family gardens, play areas, and pet friendly yards where curious hands and paws may brush against plants.

Invasiveness

Invasiveness: Unlike some spreading perennials, Geranium ‘Rozanne’ is vigorous but not invasive. It does not typically self seed aggressively, and its spreading stems are easy to redirect or trim. It tends to stay where you plant it, gently expanding over time.

Benefits

Benefits: The main benefits of growing Geranium Rozanne include its exceptionally long flowering period, easy care nature, excellent weed suppressing habit, and value for pollinators. It is a hardworking perennial that earns its place in almost any garden, just as salvias do in the sage family highlighted in Salvia: Discover 10 Key Benefits of Growing Sage in Your Garden.

Growing Conditions for Geranium ‘Rozanne’

Light

• Full sun: Best for compact growth and abundant flowering in cooler and temperate climates. Aim for about 6 hours of direct sun per day.
• Partial shade: Ideal in hotter regions, especially with shade during the harsh afternoon period to prevent leaf scorch and flower fade.

Soil

Geranium Rozanne prefers:

• Well drained soil that never stays waterlogged after rain or irrigation.
• Moderate fertility – soil that is too rich and wet can lead to lush but floppy growth.
• Neutral to slightly acidic or slightly alkaline pH. It is quite adaptable to ordinary garden soils.

If your garden soil is heavy clay, improve structure and drainage with compost, leaf mold, and grit, or plant in raised beds and gently sloping sites where excess water can drain away.

Water

• First year: Water consistently to keep the soil evenly moist but not soggy while the root system establishes. Allow the top inch of soil to dry slightly between waterings.
• Established plants: Water more deeply and less frequently. Rozanne dislikes being waterlogged and is prone to root rot if soil stays saturated.

Feeding

• Feed in early spring with a balanced, slow release fertilizer or a layer of compost scratched into the soil surface.
• Additional feeding in mid summer is optional and usually only needed if plants look tired or growth has slowed noticeably.

Mulch

• Apply a 2 to 3 in. layer of organic mulch such as compost, leaf mold, or fine bark around the base to conserve moisture and suppress weeds.
• Keep mulch a couple of inches away from the crowns to avoid rot.
• In colder climates, a slightly deeper mulch in late fall helps protect the root zone from freeze thaw damage.

Planting, Maintenance, and Propagation

Planting Tips

• Plant in spring or early fall so roots can establish in mild weather before heat or hard frost.
• Dig a hole as deep as the root ball and about twice as wide. Set the plant so the crown is level with the soil surface, backfill, and water well.
• Space plants about 18 to 24 in. apart to allow for mature spread and good air circulation, which helps prevent diseases such as powdery mildew.

Maintenance and Pruning

Geranium Rozanne is a low maintenance plant that responds well to simple grooming.

• Deadheading: Removing individual spent flowers is optional, because new blooms keep coming. Lightly shearing or tidying faded stems can keep plants looking neat.
• Midseason cut back: If plants become a bit floppy or tired in mid to late summer, shear them back by about one third. Follow with water and a light feed, and you will usually get a fresh wave of foliage and flowers.
• End of season cleanup: After the first hard frost, cut stems back to just above ground level. New shoots will emerge from the base in spring.

Propagation

Rozanne is usually propagated vegetatively to maintain its unique traits.

• Division: Every few years, in early spring or early fall, lift mature clumps and divide them into sections with several shoots and healthy roots. Replant divisions at the same depth and water well.

Geranium ‘Rozanne’: Pests, Diseases, Common Problems

Geranium Rozanne is generally a robust, trouble free perennial, but like any garden plant it can occasionally encounter pests, diseases, or cultural issues.

Pests

Aphids: These small, sap sucking insects can cluster on soft new growth, causing distortion and sticky honeydew. Often a strong spray of water is enough to knock them off. For heavier infestations, use insecticidal soap or neem based products such as those described in this neem oil guide.

Slugs and snails: These night feeding pests may chew holes in leaves, especially in damp, shady spots. Hand picking, wildlife friendly barriers such as copper tape or diatomaceous earth, and pet safe baits all help reduce damage.

Spider mites and whiteflies: In hot, dry conditions or on stressed plants, these pests may appear, causing stippling or leaf yellowing. Rinse foliage and use insecticidal soap or horticultural oil if needed.

Diseases

Root rot: The main disease risk for Rozanne is staying too wet. Poorly draining soil or chronic overwatering can lead to root rot, where plants wilt even though the soil is moist. Improve drainage, reduce watering, and avoid planting directly into heavy, compacted clay.

Powdery mildew: In humid weather or crowded plantings with poor air circulation, a white, powdery film may appear on leaves. Space plants well, avoid wetting foliage when watering, and use fungicidal sprays if the problem becomes severe.

Common Problems

Yellowing leaves: Often related to overwatering, poor drainage, or nutrient deficiency. Check soil moisture and adjust watering, then topdress with compost or a balanced fertilizer if needed.

Leggy growth: If Rozanne is shaded or stretched between taller neighbors, stems may become long and floppy. Move to a sunnier spot if possible, or cut back and allow new, bushier growth to develop.

Flower fade: In very intense sun and heat, flower color may fade slightly. Providing light afternoon shade in hot climates helps maintain rich violet tones.

Design Ideas With Geranium ‘Rozanne’

• Soft blue border ribbon: Plant Rozanne in a wavy line along the front of a mixed border to tie together different colors and textures with a cool blue thread.
• Hot and cool contrast: Weave it among bold annuals and perennials such as marigolds and zinnias to balance fiery tones with soothing blue.
• Pollinator path: Combine Rozanne with coneflowers, salvia, and verbena to create a buzzing, fluttering corridor of nectar rich blooms.
• Container cascade: Use Rozanne as the trailing, softening element spilling over the edge of large patio pots and balcony planters.
• Underplanting for roses: Let Rozanne knit around the base of shrub and climbing roses to hide bare stems and keep weeds down.

Frequently Asked Questions

Updated: December 2025