In flower beds typically 2"-3" depth. If you live in a hot, dry area, 3" would be best to help retain moisture and prevent weeds from coming up.
About 2 inches deep is good.
It depends on the price of the mulch.
Yes you should either spray them with a weed killer or simply use a shovel and dig up the sod layer, that is what I do each time I expand my flower beds. No more weeks. You can also use a recycled rubber mulch which lasts for 10 years, cuts way down on the mulch work.
The best way to mulch a tree is by using a product called Mulch Mat, it is made by Perm-A-Mulch. You get the size you need, lay it around the tree, it lasts for 10 years.
Sit down or lay down for a moment.
You should say "I am going to lie down." "Lie" is the correct verb to use when referring to reclining or resting horizontally. "Lay" requires a direct object and is used when placing something down.
you should take some aspirin and lay down
Penguin have a thick lay your fat bunder
It depends on how deep you want to lay it.
take a peice of thick plywood and lay it down on a rock and add supports underneath it .
how the hell should i know
Of course, there is no reason not too, in fact, because of their large size you can lay them down flat and put mulch on top and that will help to reduce weed growth. Sort of like natural newspaper.
Both "lay down" and "lie down" can be used to convey the action of reclining for sleep; "lie down" is more technically correct, while "lay down" is more colloquially used. So, you can choose either phrase you prefer.