Color your Garden Purple

Hardiness: Zones 3 to 8.
Bloom Time: Early spring.
Size: 2 to 5 inches high, 4 inches wide.
Flowers: Cup-shaped blooms of purple, white, yellow and striped.
Light Needs: Full sun.

Hardiness: Zones 5 to 9.
Bloom Time: Midsummer through first frost.
Size: 5 to 15 feet high.
Flowers: Tubular blooms of purple, white, pink or yellow.
Light Needs: Full sun or light shade.

Hardiness: Zones 4 to 9, varies slightly by species.
Bloom Time: Summer.
Size: 6 to 22 feet high, 8 feet wide.
Flower: Shades of pink white and purplish-blue flowers, either large pompons or flattened clusters of blooms.
Light Needs: Partial shade.

Hardiness: Zones 9 - 10.
Bloom Time: Persian shield is everpurple in zones 10 and 11; it dies to the ground after frost, but may sprout back in spring in zone 9 and possibly in zone 8, especially if you mulch the roots.
Size: 3-4 ft tall with a 2-3 ft spread.
Flowers: variegated dark green and silvery-metallic purplish-pink on top and all purple underneath. The leaves shimmer with iridescence. The little flowers are just an afterthought with this showy foliage plant. They are funnel-shaped, pale violet, and arranged on short spikes.
Light Needs: Partial shade.

Hardiness: Zones 4 to 9.
Bloom Time: Summer.
Size: 4 to 30 feet high, 3 feet wide.
Flowers: Dozens of colors including white, pink, red, purple, blue, and yellow. Some have multicolored blooms.
Light needs: Full sun to partial shade.

Botanical Name: Lavandula.
Hardiness: Zones 5 to 10.
Bloom Time: Summer.
Size: 1 to 4 feet high, 1 to 4 feet wide.
Flowers: Pinkish purple.
Light Needs: Full sun.

Botanical Name: Viola x wittrockiana.
Hardiness: Zones 4 to 8.
Bloom Time: Varies by cultivar. Most types perform best in the cooler weather of spring or autumn. In warmer climates, some varieties can be used as winter annuals.
Size: 6 to 9 inches high and 9 to 12 inches wide.
Flowers: Purple, white, yellow, orange, and red. Bi-colored flowers with a face-like pattern are the most common; shape is five overlapping petals, some with ruffled edges.
Light needs: Full sun to partial shade.

Flickr Photo Credits: shaire productions - purple yellow, Goodnight London - purple & red, A-Daly - purple and orange, swotai - purple and white

Botanical Name: Ajuga reptans.
Hardiness: Zones 3 to 9.
Bloom Time: Late spring to early summer.
Size: 4 to 8 inches high, 8 inches wide.
Flowers: Purplish blue.
Light Needs: Full to partial shade.

Hardiness: Annual.
Bloom Time: Late spring to frost.
Size: 4 to 24 inches high, 12 to 36 inches wide.
Flowers: Mainly pink, red, pale yellow, violet-blue, white, or multicolor funnel-shaped single and double flowers.
Light Needs: Full sun to partial shade.