Blue fountains delphinium Captivating blue, purple, and white flower spikes will only get to about three feet tall, but won't require any staking support. These huge blossoms will bloom in June and July, but can bloom again in the fall if cut back after flowering.
Salvia guaranitica 'Black and Blue' - Towering sub-shrub with handsome dark green, toothed leaves and 30cm long, upward pointing flowering spikes of the most exceptional rich dark blue/black from late summer through autumn. The flowers are loved by bees. Grow in moist but well-drained soil in sun. This is a vigorous, towering plant and may need some support. Mulch well around the roots in late autumn. Eventual mature plant size : Height 2.5m Spread 90cm