Hollyhock is a sun-lover, but needs regular watering. Watch for rust on the leaves. They take the sun or shade. They are very hardy, and give their main blooms in summer and early autumn. Flowers are spectacular in shades from white to azure blue.
China asters have big, frilly flowers that are long-lasting as cut flowers.
They are mostly available in mixed colors. Use low- growing kinds as edging plants, taller ones for cutting. Asters like full sun and rich soil, and can be started from seed directly in the garden. True cockscomb has velvety flowers in fan-shaped clusters in shades of pink, red or gold. This is very showy.