This grower is sure of this plant identification.
Salvia patens (Sage). This is a tuberous, rooted, upright branching perennial, which produces whorls of vivid blue flowers. The leaves are oval and mid-green.
Some species will tolerate only light frosts, but some of the perennials are more frost-hardy. They will grow well when planted in full sun in well drained light soil with adequate watering in the summer.