Blue beard or blue mist, caryopteris (Caryopteris x clandonensis) produces clusters of mild to deep blue flowers on tall stems from late summer to October.
Hydrangeas are great for cutting in many varieties. Indoor arrangements using bigleaf hydrangea (Hydrangea macrophylla), especially mop-head varieties, are popular.
Ninebark (Physocarpus spp.) is a great vase filler beyond its late spring blossoms. Summer brings stunning deep pink or crimson seed pods after clusters of tiny white or pink blossoms.
Again, smoke bush (Cotinus coggygria) is valued for its leaves as much as its blooms in arrangements. Flower clouds in late spring and summer are yellow, light, or deep pink, depending on type.
Roses (Rosa spp.) are popular cutting flowers because to their elegance, variety of colors, lengthy bloom season, and enticing aroma. Roses are best for indoor bouquets when cut when the petals are just opening.
Gardenia (Gardenia spp.) white blooms fill your home with their seductive scent. Cut gardenia stems to 4–6 inches long and remove the lowest leaves, keeping many dark, glossy higher leaves to promote flowers.
Summersweet (Clethra alnifolia) is a thickly branching shrub with glossy green leaves. Pollinators flock to its fragrant white or pink blossoms in late July, which last 4–6 weeks.
Butterfly bush (Buddleia spp.) attracts butterflies to the yard. Arching stems with clusters of densely spaced flowers make stunning indoor bouquets alone or in mixed arrangements.