By Tilly3006
Lancashire,
United Kingdom 
when to plant perennials - i purchased some perennials last autumn which were all dormant. They have lived in the conservatory since october. There is now lots of new growth particularly on the red hot pokers and eryngiums. They are in large pots as it is and the roots are now showing through the bottom. When is the best time to plant these out into the ground? - thanks
15 Feb, 2011
Answers
I agree with Nicky. They need to be gradually hardened off now. Take every opportunity to put them outside until they can be left out all the time. I have a number of perenials that I have raised and would be hoping to plant them in the ground by April, weather permitting.
15 Feb, 2011
thanks bulbaholic & nicky. I will certainly take your advise and harden them all off before planting out. Much appreciated.
16 Feb, 2011
They should really of been planted in Autumn but if that wasnt possible, planted in pots and left outside so they go through a normal winter. Planting them outside now will not be a good idea as they have been used to warm temperatures from the conservatory, even if it isn't heated. Best to put them outside on good days and over night provided there are no frosts or strong cold winds. Eventually they will get acclimatised. Plant in the ground in a month or so depending on weather conditions.
15 Feb, 2011