Well first you have to get them out of the ground - you don't say how long they've been in, but you do say they're large. If they're full sized trees, you will need heavy lifting gear, a small digger and a large tarpaulin with ropes inserted round the edges to slide under the rootball, attach to lift gear and raise mechanically to move them. If they're palmatum types, then hopefully you won't need all that kit to get them out. Not really a great idea to sit them in a garage all winter, best replanted immediately, or within a few hours.

or replant them in very early spring the same way as bamboo sais .

Don't forget that the roots are probably the same size as the growth you can see.

If they're really LARGE your best bet might be to get the existing trees out - tree surgeon, stump grinder and all - then plant new trees when you're ready.

The time for planting bare root trees is November - March, and sometimes the nursery's sold out by March if you want something popular.

Trees growing in pots can be planted out any time, but are more expensive, will probably be bigger so will need more care for the next couple of years.

NP no large tree is going to survive wrapped up in burlap overwinter they need to be in the ground - sorry.

Do you have a vegetable garden, Robin? There will be space to plant them over winter and then move again at the end of winter.

provided they are not too large... remember the roots need to reestablish themselves asap!

no i said dont touch it till early spring then move it not dig it up now .you missunderstould me and perhaps i could of elaberated moon grower .

You could also be mindful in all this that Japanese maples hate root disturbance, and transplanting will often end in failure at the best of times.

definatly so what ever you do realy its best only once weather its now or early spring. lets face it even thow some plants are amazinly tolerant of being moved its definatly not very natural in a plants life cycle to be replanted/potted .

Are they Japanese acers? Or are they some other species of "large acer"? I read it as possibly being a field maple or sycamore or similar. If Japanese Acers, it's a whole lot more feasible than if Big Acers.

Thank you to all of you who replied to my question,the acers are of the palmatum family and they will be over 25 years of age. Would it kill the trees if they were pruned severly?

I use the "Rule of Thumb": don't cut into anything more than thumb-thick, unless you are removing it entirely.

I'd agree on that Tugb.