Some flowers are sent packed flat in boxes. This enables large amounts of flowers to be packed in small spaces like aircraft holds. Other flowers cannot survive for long periods out of water such as orchids, gerberas (gerber daisies) and water lilies. These are either sent with their own sealed water container (called picks) on each stem end - for more expensive or tropical flowers - or are transported in buckets of water (This method of transport in water is often referred to as ["Procona]"). The latter method extends the life of flowers and reduces labor time as flowers are ready for sale, but obviously also reduces the amount of flowers that can be transported as they are much heavier than dry-packed flowers and hence air transportation charges are higher.
Flowers take a number of routes to the consumer, depending on where they are grown and how they are to be sold. Some growers cut and pack flowers at their nurseries, sending them directly out to the consumer by mail order. Some flowers are sent to packing companies, who grade the flowers and arrange them in bunches for sale to supermarkets or to deliver by mail order. Some flowers are graded and sleeved by the growers and sold at wholesale flower markets; the wholesalers then sell them on to florists who condition and arrange the flowers for the consumer.
Source : http://en.wikipedia.org/wiki/Floral_industry#New_flower_growing_centres
See Also : Bouquet, Roses, Floral