Rosa rugosa
Gravereaux collected roses from all over Europe and started to create new rose varieties for the production of rose oil for perfume, which would facilitate the process of distillation. He worked on hybrids of Rosa rugosa and developed the cultivar 'Rose à parfum de L'Haÿ', among others. In all he created 27 new cultivars, primarily for rose oil production. The very fragrant, crimson-purple rugosa hybrid 'Roseraie de L'Haÿ', was named for this garden.