Keeping flowers looking fresh after cutting them is difficult whether you have a green thumb or not, but it you want to start the process the right way, home-centric blog Apartment Therapy recommends cutting them during the coolest part of the day.
Photo by: Krikit.
The reasoning is that flowers have more moisture during cold periods, so cutting them during these points ensures they retain that water before they're brought inside. Combining this with a DIY solution, a little aspirin, or vodka should keep them lasting a long time. For more tips, hit up the Apartment Therapy link below.
5 Tips for Better, Longer Lasting Cut Flowers [Apartment Therapy]