Posted: 23/05/2014 at 14:00
It's one of those things that largely depends on your own conditions in the garden and your climate. I've moved conifers/pieris and potentillas even in the middle of summer, but I live in an area with high rainfall so it's easier. I make sure that the hole it's going in is well prepared with compost etc, followed by good aftercare - a general feed, watering and mulching till established. If you can do that then go ahead - but normally autumn would be the best time as the ground is usually favourable and the plant can get going enough before winter.
Peanuts - if the one you moved hasn't established very well, give the roots a bit of a tease out before you put it back in the ground and make sure the hole it's going in is a decent size. Plenty of water initially and you should see new growth fairly quickly. Sometimes they just sit if the conditions aren't great so the more help you can give at the start, the better the result