I have spruce tree that died within 1 month ( from green to total dryness) is this normal?

This specialist website should be of help to you with more info on that.

http://www.ubcbotanicalgarden.org/forums/showthrea...

Unless he cut the roots, I don't think the gardener had anything to do with it. A few things to consider:

1- Was the spruce a new planting or had it been there a while? A new planting is more subject to shock than an existing plant.

2- Have you had a dry, hot Summer? A recent planting doesn't have a large root structure so the effects of a lack of moisture are more drastic than with a mature tree.

3- When the tree was planted, did it go into a mostly clay soil or was the soil of a type that allowed the roots to establish themselves easily? If the soil was mostly clay, the roots might have been unable to spread out and became girdled.

4- Is there any place where sap is running on the tree? If so, insects were the problem.

To determine if it's still alive, take a thumbnail and scrape one of thinner branches. If there is a slightly green cast to the material underneath the bark, there is still vascular action in tree. Then look at the dead spots in the tree. Those parts will not come back and will have to be trimmed out. Is there enough left to look attractive?

If it's all brown it's dead and has been for probably longer than a month. Evergreens like spruce, cypress and juniper can be green for a month or more after they have died. It just takes them a longer time to dry out and turn brown because of their foliage. It holds moisture much longer than deciduous foliage does.

It's quite common actually.

My bush went very dry when I employed a gardener to do something in my rear patch.

I'd suggest a harsh pruning would be in order.

evergreens shock easily. They are pretty tender after transplanting. they usualy need acidic soil.

that fast, it could have been spider mites....