February 2007 issue of the Cornell Flower Bulb Research Program Research Newsletter:
In a joint project, financed by the Dutch Product Board for Horticulture, PPO and Cornell University investigated the role of temperature and drying out in the loss in quality of perennials during storage and shipping. The research was carried out with the genera Echinacea, Helleborus, Papaver, Phlox, Achillea, Aster and Geranium.
Read the whole article. Starts on page 5.