Introduction & History

Among the Moss roses, 'William Lobb' stands as a giant in every sense — an immensely vigorous shrub that can hurl its long, arching canes three meters into the air, clothing them in early summer with some of the most dramatically colored blooms in the old rose repertoire. Named after the celebrated Victorian plant hunter who collected for the Veitch nurseries in South America and California, this 1855 creation of Jean Laffay opens dark crimson-purple, its semi-double flowers aging through a mesmerizing progression of lavender, violet, and grey-lilac that earns it the evocative name 'Old Velvet Moss'. The mossy buds, the sumptuous color transitions, and the sheer exuberance of growth combine to make William Lobb one of the most theatrical and memorable of all old garden roses, a rose that demands space and attention but repays both with a midsummer display of breathtaking extravagance that lingers in memory long after the last petal has fallen.

Breeding History

Bred by Jean Laffay at his nursery in Bellevue-Meudon near Paris, France, and introduced in 1855. Laffay was the foremost rose hybridist of the mid-19th century, responsible for many important Moss and Hybrid Perpetual roses. The exact parentage of William Lobb is not recorded, but it likely involves crosses between established Moss roses and darker-colored Hybrid China or Damask varieties to achieve its unique purple-crimson coloring. The rose was named after William Lobb (1809-1864), the plant collector who introduced the monkey puzzle tree, many conifers, and numerous South American plants to European gardens through the Veitch nursery in Exeter.

Flower Form & Fragrance

Flowers are semi-double to double, with 40-60 petals, borne in large, crowded clusters of 5-20 blooms. The buds are well-mossed with dark, brownish-green glandular moss. Newly opened blooms are a deep, velvety crimson-purple, rapidly aging through magenta to lavender-grey, so that a single cluster often displays the full color spectrum simultaneously — the famous 'stained glass window' effect. Blooms are 6-7 cm across. The fragrance is strong and rich, a heady mix of damask sweetness and resinous moss, carrying well in still air.

Garden Design & Uses

William Lobb is best used as a large shrub at the back of a deep border, as a pillar rose on a sturdy support, or trained against a wall or fence. Its immense vigor and lax habit make it unsuitable for small spaces. The dark, moody colors look magnificent against grey stone walls or silver-leaved planting. Combine with purple sage, alliums, and white foxgloves for a dramatic scheme. Plant where the extraordinary color changes can be observed over several days. Can be trained horizontally along a fence to maximize flowering laterals.

Growth Habit & Hardiness

Exceptionally vigorous, producing long, strong, arching canes that reach 200-300 cm tall and 180-200 cm wide — or more when supported. Growth is rapid and somewhat coarse, with stout, well-armed stems bearing numerous hooked thorns. Foliage is dark green, rough-textured, and moderately healthy. The moss is dark, brownish-green and slightly bristly rather than soft. Once-flowering in early to midsummer, with a spectacular but relatively brief display lasting two to three weeks. Without support, the long canes arch dramatically to the ground.

Climate & Hardiness

Hardy in USDA zones 4-9. Extremely cold-tolerant, surviving temperatures to -35°C. The vigor and robustness of William Lobb make it adaptable to a wide range of climates. Performs well in cool, temperate regions where the purple coloring develops best. In hot climates (zones 8-9), the flowers fade more quickly and the color show is less dramatic. Good rain tolerance — the clusters shed water reasonably well. Wind tolerance is moderate if canes are adequately supported.

Seasonal Care Calendar

Planting & Container Growing

Plant in fertile, well-drained soil enriched with compost, pH 6.0-7.0. This vigorous rose benefits from deep soil preparation. Space at least 150-180 cm from neighboring shrubs. Against a wall or fence, plant 45 cm from the base and lean the plant toward the support. Set bud union 5 cm below soil level. Mulch generously. Full sun gives the best flowering, though light shade is tolerated. Good air circulation helps prevent mildew.

Container Growing

Feasibility: Difficult. William Lobb's immense vigor makes it poorly suited to container culture. If attempted, use the largest possible container (60 cm minimum diameter), sturdy support, and accept reduced growth. Heavy feeding and watering are essential. More practical to grow as a garden shrub. Container cultivation might be considered only on a large terrace where no ground planting is possible.

Seasonal Care & Pruning

Spring: In March, remove dead and weak wood. Shorten lateral shoots by one-third but retain the long structural canes. Apply generous quantities of slow-release fertilizer and thick mulch to fuel the vigorous growth. Tie in new canes to supports as they extend. Summer: The flowering display occurs in June-July. After flowering, optionally remove spent flower clusters. Tie in the season's new long growths. Continue watering during dry spells. Autumn: Tie in all long new canes before autumn storms. Apply potash-rich feed. Clear fallen leaves. Winter: Check supports and ties. Mound base in severe climates.

Common Mistakes to Avoid

1) Underestimating the vigor — this rose needs substantial space and strong support. 2) Attempting to keep it small through hard pruning — better to give it room or train it. 3) Planting in a narrow border — the arching canes will overwhelm small spaces. 4) Expecting repeat bloom — this is emphatically once-flowering. 5) Neglecting to tie in canes — unsupported growth creates an unwieldy tangle.

Propagation

Hardwood cuttings in late autumn are the most reliable method — the vigorous nature of William Lobb means cuttings root willingly, with success rates of 60-70%. Semi-ripe cuttings in July also succeed well. Budding onto Rosa laxa or R. canina rootstock is standard for commercial production. Own-root plants are vigorous and perform excellently. Layering of ground-touching canes is virtually foolproof for this naturally arching rose.

Diseases & Pests

Disease resistance is above average for a Moss rose. Some susceptibility to powdery mildew in humid conditions, but less prone than the Common Moss. Black spot may appear in wet seasons. The dark moss is less prone to botrytis than lighter-colored Moss roses. Aphids colonize new growth in spring. Sawfly larvae occasionally skeletonize leaves. Red spider mite can appear in hot, dry conditions. Overall, William Lobb is considered one of the healthier Moss roses and a good choice for lower-maintenance gardens.

Cut Flowers & Exhibition

Cut clusters when the first buds in the spray are opening — this captures the spectacular color transition effect. The stems are long and strong, excellent for large arrangements. Strip thorns carefully and condition in warm water. Vase life is 4-6 days. The aging color changes continue in the vase, making arrangements increasingly beautiful over time. Combine with silver foliage for dramatic effect.

Collector & Exhibition Notes

An essential Moss rose for any collection, prized for its unique color and vigor. Widely available from heritage rose nurseries. Can be exhibited in old rose classes — clusters showing the full color spectrum are always impressive. William Lobb is one of the most planted and best-known Moss roses worldwide. Present in virtually all major heritage rose collections. Named cultivar — not to be confused with the similarly vigorous but distinct 'Gloire des Mousseux'.

Comparison with Similar Roses

William Lobb dwarfs most other Moss roses in vigor, reaching twice the height of 'Nuits de Young' or 'Alfred de Dalmas'. Its color is unique among Moss roses — 'Nuits de Young' is darker and more compact, while 'Common Moss' is pink and softer. Compared to 'Capitaine John Ingram', William Lobb is taller and more purple. Against the Centifolia Moss 'Chapeau de Napoléon', it has true moss rather than crested sepals, and far more vigorous growth.

Heritage & Conservation

Securely preserved in commerce and in heritage rose collections worldwide. Found in virtually every major rose garden including Sangerhausen, Mottisfont Abbey, L'Haÿ-les-Roses, and the Cranford Rose Garden. Not endangered. William Lobb's vigor and ease of propagation ensure its survival. It is one of the most widely planted and admired of all Moss roses and is unlikely ever to become scarce.

Cultural Significance

William Lobb embodies the Victorian era's dual passion for plant hunting and rose breeding. The rose's namesake was one of the great botanical adventurers of the 19th century, and the rose itself represents the peak of the Moss rose breeding era. Its dramatic color changes have inspired garden writers from Graham Stuart Thomas to David Austin. The 'Old Velvet Moss' epithet captures the tactile, luxurious quality that Victorian gardeners prized. William Lobb appears in many historic garden restorations.

Frequently Asked Questions