Water the plants four or five days before sending, so they are well hydrated but not dripping wet.
Fill a sturdy cardboard box with three or four inches of packing filler such as paper shred, plastic grocery bags or peanut foam.
Prepare the plants for shipping. Remove as much soil as possible from the roots of the plant. Wrap the roots in wet paper towels. Wrap the paper towels in plastic food wrap being careful not to let the plastic wrap touch the stems. Seal the plastic wrap with tape.
Package the plants. Place each plant on several layers of newspaper. Roll the newspaper up around the plant and plastic-wrapped roots so it's completely encased in the newspaper. Fold the ends over the leaves and root ends. Seal with tape. Label the plant by writing on the newspaper.
Place the plants into the box on top of the packing filler. Place filler between each newspaper-wrapped plant and between the plants, sides and top of the box. The filler not only protects the plants, it insulates them from the cold.
Send overnight delivery or two to three day delivery.