I would like to move 3 hydrangea plants to more shady spots.?

October is dfine in that area. They do best in a location that gets morning sun and partial shade the rest of the day. Keep the soil moist but not soggy.

I have done that with hydrangeas too, and it worked very very well. Unlike you, I did it during the summer... obviously your idea is the better one. Use a root stimulant when you transplant, such as fish oil, and you'll probably have the best results. They are wonderfully tough plants.

You don't have to mind about the roots, if you don't get all that'll be natural root prune. One tip is to make sure the soil is the same as the previous if you desire the same bloom colors.

they will separate easily, October or thereabouts is perfect, unless you have a lot of space consider swapping one for something else. be sure to add some fertilizer and grit to planting hole..i don't give tips, your wage should cover that. tipping is a u.s. habit, not done much in u.k.