Color: Pink Flower Size: 2-3″ (5-8cm) Flowering Period: July-Sept Mature Height: 8-12′(2.5-3.5m) Pruning Group: C Planting Aspect: Sun/ Partial Sun / Bright Shade USDA Zone: 4 Foliage: Deciduous Fragrant: Yes Price Group: 2 About Texensis Princess Diana Princess Diana’ a texensis type has tulip-shaped, 2-3″ (5-8cm) flowers that occur from July through September. This delicate but beautiful flower lives up to her namesake. Pruning group C.