1. Rain resistance!
2. Herman2 mentioned that he would begin planting his trees out in the first season to cut down on the work of raising trees in pots. There was not much discussion at the time but I took it seriously. He also reported that planting on a slope helps reduce splitting.
3. I moved to a nicer place this year and as a result gained an excellent site for a fig. At my house there is a much higher amount of sand, but both soils are silty. When I talked with the landlord about planting a fig tree he told me that the spot I picked on the west side of the house used to have a drainage problem and he excavated and backfilled with rock, "perfect" I said. So in late May I placed a 4 month old RdB on the border of the native soil and rock. Well, this tree set a record for growth, it reached over 4ft, branched and suckered the base of the trunk swelled to about an inch thick. There are several variables that could have helped this tree so I can't say for sure that it was the rocks, the sand, the perfect ph, the variety, or the initial health of the cutting. This was a spare RdB and I have also lost trees after planting out for mysterious reasons, accidents and poor choice of location. I am glad that I took the chance though.