- Some common caterpillar food sources are asters, borage, chickweed, clover, crabgrass, hollyhocks, lupines, mallows, marigold, milkweed or butterfly weed, nasturtium, parsley, pearly everlasting, ragweed, spicebush, thistle, violets and wisteria. Caterpillars also thrive on trees such as ash, birch, black locust, elm and oak.

- Annual nectar plants include ageratum, alyssum, candy tuft, dill, cosmos, pinks, pin cushion flower, verbena and zinnia.

- Common perennial nectar plants include chives, onions, pearly everlasting, chamomile, butterfly weed, milkweeds, daisies, thistles, purple coneflower, sea holly, blanket flower, lavender, marjoram, mints, moss phlox, sage, stonecrops, goldenrod, dandelion and valerian.

Remember that butterflies are cold-blooded insects that bask in sun to warm their wings for flight and to orient themselves. They also need shelter from wind, a source of water, and partly shady areas provided by trees and shrubs.

Another alternative to producing blue roses is to simply use dyes to change color of petals from white to blue. By placing a dye in water rose drinks, it creates a blue color in leaves, petals, and stem. While rose looks blue, it is not because it grew this way, but because of dye.

So, if you are dead set on finding blue roses you may want to consider above options. We continue to wait for scientists to develop a true blue rose. This rare beauty will bring great job to rose lovers everywhere.