Belgian breeder Louis Lens became particularly important for his work with Hybrid Musk roses. Rather than concentrating solely on large, high-centered exhibition flowers, Lens developed graceful shrubs carrying large clusters of smaller flowers, often with repeat bloom, natural growth habits, good foliage, fragrance, and value for bees and other pollinators. His work expanded the Hybrid Musk group with numerous garden-worthy varieties.
Among his best-known roses is Guirlande d'Amour®, a heavily flowering white Hybrid Musk capable of growing as either a large shrub or climber and recognized with multiple international awards. Bouquet Parfait, Paganini, Focus, and other Lens introductions further demonstrate his preference for generous clustered flowering and informal landscape character. His work has had lasting influence on gardeners seeking roses that blend naturally into mixed gardens rather than functioning only as formal specimen plants.