Posted: 16/08/2014 at 13:42
I would move it now...but that's me.
However wait for autumn...September or October and move it getting the full rootball. It may have one or two longish roots outside the main rootball but that's not a problem. Cut them back a little. As already said, they are tough and will transplant just fine.
Dig around your spirea ...probably 9" all around the bush. Then lever slightly with your spade all around the dug area to lift your spirea. Then spade underneath and lift.
Dig a hole half as wide again as the rootball you have dug up and slightly deeper. Plant your spirea. Ideally mix some compost with the soil plus a handful or so of granular fertiliser and fill in around your newly planted shrub. Firm well ...I use my heel and hands.....just enough to anchor your plant. ,lightly press your rootball Imto,the hole. Leave a slight hollow to allow for a generous watering ....do this twice.....and allow,the water to drain away. Then rake back the soil so that the top of the rootball is level with the garden soil. In a couple of days apply a mulch of something like dried cow manure or even bagged compost.
Cuttings too are easy.