Get a good potting soil and don't overwater.

Same here for the zone and the greenhouse conditions. Well they are very hardy! Just be very careful not to break any little roots! Dig the hole deep enough for the roots to fit without being crushed or doubled back. After you fill the hole back up, I protected the area around the base of the little plants with a simplified version of hugelkultur (sp?) Meaning I took a small piece of grass sod and cut a slit halfway up so I could have it circling the base of the plant (grass side down, roots up... so flipped) then covered that in more dirt like a mound and packed it down. mine growing crazily fast, they're in an area that is between a fence and a house so it gets heat and sun all day but only direct slight only a few hours per day (at high noon).