Can you recommend some flowers for a cutting garden that will last all summer?

If you’re gardening in a sunny spot, you can grow the following for cutting: snapdragon, marigold, China aster, cornflower, larkspur, dianthus, lisianthus, strawflower, sweet pea, lavatera, stock, phlox, scabiosa and zinnia. You might also try dahlia, delphinium, campanula, aster, ranunculus and liatris.