Liatris Alba also known as White Blazing Star is white and is bee friendly.
White
Details:

Cut Flowers
Pollinator

Liatris like well-drained soil and sunshine.

Good for beds, borders and as cut flowers.
Planting: 5cm/2 inches 10cm/4 inches

Good for beds, borders and as cut flowers.
Flowering: June/July 60cm/24 inches