There are different types of summer blues, from the blues that hit on hot, muggy days when the thought of weeding is not to be borne, or those that follow drenching rains that have turned the raspberries to mold. Then there are the blue flowers that are much more rare than the sunny golds that predominate in the mid to late summer garden. True blue, the color of forget-me-nots, is not a common color in the summer garden,…