It's pretty apparent that not many of my crotons in the collection are going to last long without some type of protection in winter. I am considering burying the whole pot in the ground vs. outright planting. Why? Because 1.) I can haul them into the greenhouse during cold snaps and 2.) I don't intend to stay in the house longer than 2 yrs and want to take them with me. I guess I am asking, how fast/deep is their growth rate. Most are currently in 3 gals and were from air layers last year. Will this size pot be sufficient for this year or should I bump them up to fives before sinking in the ground?