• leaves should be healthy green, not yellow.
• Double-headed flowers usually last longer than their single-headed counterparts such as single and double Eustoma (lisianthus) and Freesia.
• Loose pollen on petals is an indication that the flowers are nearing the end of their life.
• Flowers are vulnerable to draughts, so choose bunches that have been displayed inside the shop.
• Some cut flowers such as carnations and chrysanthemums live longer than others. Do not expect Iris, sweet peas, or stocks to last as long.
• As a rule of thumb, scented flowers have a shorter life as a cut flower.
• The florets that make up the disc at the center of spray chrysanthemums and Gerbera should not have released their yellow pollen.
• The center should be clearly visible. There should be no loose pollen.
• Some but not all flowers have a fragrance. What is worth remembering is that flowers give off more scent in a warm room and high perfume is a sign of freshness.
• Bulb flowers, such as daffodils, anemones, and tulips, last longer in shallow, not deep, water but always ensure they have a good supply.

Content reference from Judith Black Lock (Author) - Flower arranging