I plant 3 of any plant in a 18 inch container. springcolor is right. The plants come in a flatrate box and are in paper tubes.They need to be removed and the plastic bags around the plugs need to be removed also. Dont take the plug off. I just put the whole plant in the planter.Give them plenty of water. These are tropical plants and love warm night temps.
Springcolor is right.Cold temps will cause the leaves to fall off and the plant will die.
I plan my order to arrive the end of May. We have freezes until mid May so I plant directly in containers when the plants come.