Gaura lindheimeri 'Baltincite' ~ Ballerina™ White Gaura size-2-5-cal and white with dark faces

and white with dark faces that blooms in early spring and fall and can be deadheaded to prolong blooms

Dianthus is a compact mat-forming perennial with narrow foliage and sturdy upright flowering stems topped with typically 5-petaled flowers with frilled or zigzagged edges

Here's some information about the Sourwood tree:

The large leathery lobed foliage has a pair of deep sinuses in the middle and turns shades of yellow-brown in fall

which is fatal

Gaura lindheimeri 'Baltincite' ~ Ballerina™ White Gaura size-2-5-cal and white with dark facesBallerina White Gaura is a compact native herbaceous perennial with lance like dark green foliage and graceful flower stems. The four white petaled flowers bloom from soft pink buds along the flowering stem from late spring into fall. Prefers full sun and loamy well drained soils. Heat, humidity, and drought tolerant. Type: Perennial Origins: Louisiana, Texas of U. S, and Mexico Height: 1' 1. 5' Spread: 1. 5' 2 Spacing: 2 USDA Hardiness Zone: 6 9