Re: when to bring em back out?
It depends from cultivar to cultivar and on your method of culture.
To me i go as follows so far;
I pot tem up in autum, around a month before the temperture go to low to permit the leaf growt. So, i give the plant a month to recover from transplanting and get used to the new pot.
In spring i check the climate normals to see the last days of a recorded freeze in the history of my city; about 10 days before that day, if the weather forecasts are good, i plant them in ground if they are already actively growing in post. Of course, root growing has been very limited during winter, however i don't disturb the roots to let the plat grow as quickly as possible. If forecast aren't good, i wait till they predict a solid 10-15 days of nice spring time.
This is what i do for my dwarf orinoco: a pretty hardy one. For my dwarf cavendish i do pretty much the same, but waiting 3 weeks more that i have done for the dwarf orinoco. Still wating good forecast etc but i want temperature slightly superior for that one.
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