Syringa, Bush Rockspirea, Tansybush, and even Limber Pine grow in large crevices.
From the en.wikipedia.org
At the center of Lizzie's world and the South African life around her is the syringa tree.
From the sltrib.com
More examples
Mock orange: large hardy shrub with showy and strongly fragrant creamy-white flowers in short terminal racemes
Genus of Old World shrubs or low trees having fragrant flowers in showy panicles: lilacs
Syringa (lilac) is a genus of 12 currently recognized species of flowering woody plants in the olive family (Oleaceae), native to woodland and scrub from southeastern Europe to eastern Asia, and widely and commonly cultivated in temperate areas elsewhere.
Any of several flowering plants, of the genus Syringa, such as the lilacs
For mezzo-soprano, bass-baritone, guitar, and ensemble (1978)