Harvest attractive bouquets from early summer straight through fall. Here’s how to fill your home with flowers: 1.) Choose flowers that have recently opened or are about to open. 2.) Cut the flowers with sharp shears, including long stems. 3.) Snip off any leaves or sideshoots from the stems. 4.) Arrange the zinnias, cosmos, and bishop's flowers in your hand with tall flowers in the middle. 5.) Cut the bouquet to the shortest stem length. 6.) Add the smaller snapdragons.