Mystery Gardenia 1 Plants - 2 Feet Tall Ship in 3 Gal Pot Noted for its enormous blooms, Gardenia jasminoides 'Mystery' (Cape Jasmine) is a large evergreen shrub with shiny, lance-shaped, dark green leaves and powerfully fragrant , snowy white, roselike flowers, up to 4-5 in. wide (10-12 cm). ... In hot climates, Gardenias grow best with morning sun and afternoon shade. Plant Type: Shrubs Height: 6' – 8' (180cm – 240cm) Hardiness: 8 – 11;