Iceberg rose

Sun

Full sun, ideally at least 6 hours daily; tolerates light shade but flowers less freely.

Water

Water deeply during dry spells, especially in the first growing season. Established plants tolerate brief dry periods but flower better with consistent moisture.

Soil

Fertile, moisture-retentive but well-drained soil, preferably slightly acidic to neutral; tolerates clay if drainage is adequate.

Height

3-5 ft (0.9-1.5 m)

Spread

3-4 ft (0.9-1.2 m)

Flowers

Clusters of double white flowers from late spring or early summer into autumn; buds and flowers may show a pink blush in cool weather.

Foliage

Glossy, light to medium green leaves with toothed leaflets; normally deciduous but may retain leaves in mild winters.

Growth

Moderate to fast

Care needed

Medium

• Pollinators
• Heat tolerant
• Low allergen
• Fragrant

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Moderate

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   2.2 ft (0.68 m)

3. After 2 years

   2.8 ft (0.85 m)

4. After 3 years

   3 ft (1 m)

5. After 5 years

   4 ft (1.2 m)

   full size

About 4 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Growth rate

Fast

• Water at soil level when the root zone starts to dry; avoid frequent light sprinkling.
• Apply a rose fertiliser as spring growth begins, then feed again after the first main flush according to the label.
• Spread 2-3 in (5-8 cm) of organic mulch over the root area, keeping it clear of the stems.
• Allow space between plants for air circulation and remove fallen diseased leaves.
• Deadhead spent clusters to a healthy leaf to encourage further flowering.

Pruning. In late winter or early spring, as buds begin to swell, remove dead, damaged and crossing stems and shorten healthy shoots by about one-third to one-half. Remove suckers arising from below the graft union at their point of origin.

Late winter

Prune before vigorous growth starts; delay in very cold districts until severe frost is less likely.

Spring

Apply rose fertiliser and renew mulch after watering the soil.

Late spring

Check soft new shoots for aphids and inspect lower leaves for black spot.

Summer

Water deeply during dry weather, deadhead regularly and feed after the first main flush.

Autumn

Stop feeding and collect fallen diseased leaves; avoid hard pruning before winter.

Early winter

In colder parts of its range, protect the crown or graft union with a mound of soil or compost once the plant is dormant.

• Plant several together as a low flowering hedge beside a path, leaving room for thorny stems to spread.
• Repeat through a mixed border with catmint and hardy geraniums to link planting groups with white flowers.
• Use in a white garden with silver foliage and contrasting flower shapes.
• Grow in a large container near a sunny seating area where its long flowering season can be enjoyed.

Garden styles it suits: English country, Cottage garden, Formal, Romantic rose garden, White garden and Moon garden.

Plant it with: Catmint, Hardy geranium, Lavender, Lady's mantle, Salvia and Lamb's ears.

Wildlife: Bees may visit flowers once the centres open, though the double blooms offer less access than single roses. Dense growth gives small insects and birds some shelter.

• Black spot causes dark leaf spots, yellowing and premature leaf fall: collect infected leaves, water at soil level and improve airflow; use a locally approved rose fungicide if repeated severe outbreaks warrant treatment.
• Powdery mildew produces a white coating on young growth: prevent drought stress, improve airflow and remove badly affected shoot tips.
• Aphids cluster on buds and soft shoots: wash them off with water or use insecticidal soap according to the label, avoiding open flowers.
• Winter dieback can kill exposed stems in cold districts: protect the crown, avoid late-season nitrogen feeding and cut dead wood back to healthy tissue in spring.

Not known to be toxic to cats, dogs, horses or people. Thorns can puncture skin and injure mouths or eyes, and swallowed plant material may cause mild stomach upset.

• Climbing Iceberg rose (Rosa 'Climbing Iceberg')

  The flowers are very similar, but the climbing sport produces long canes, commonly reaching 10-15 ft (3-4.5 m), and needs support and different pruning.

• Margaret Merril rose (Rosa 'Margaret Merril')

  Its white flowers are usually more high-centred, often blush pink in the middle, and much more strongly fragrant than Iceberg.

The name Iceberg refers to its white flowers, while the German name Schneewittchen means Snow White.

Propagation. Take softwood cuttings in late spring or early summer, or hardwood cuttings from mature shoots in autumn. Named plants are also propagated by budding or grafting; seedlings will not reliably match the parent.

Accepted botanical name

Rosa

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.