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Weeds can grow through rubber mulch, but it depends on if you removed all the weeds in your garden beforehand. Weeds already in the soil can grow even when using rubber mulch. However, that doesn’t mean that your garden will be littered with rubber and weeds, but it does mean that the occasional weed might still pop up. Another way you can increase your weed suppression is by using landscape fabric as a second layer. 

The cheapest landscape rock is gravel, pebbles, or decomposed granite. These small rocks are great for affordable driveways and walkways. If you’re looking for larger rocks as a building material, you can get fieldstone affordably, especially if sourced from somewhere in your area.

You should add 1 to 4 inches of mulch, depending on your garden type and needs. Keep in mind that no amount of mulch can completely prevent weeds, but a heavier coverage (closer to 4 inches) can suppress weeds enough that you are only seeing them sprout every few weeks. Finer mulch prevents weeds more effectively than large mulch, so if you’re using mulched leaves or shredded bark, 1 to 2 inches will likely suffice, while 3 to 4 inches is best for larger mulch, like bark chips or straw.

Artificial turf usually requires some sort of base. If you’re installing the grass over soil, you’ll want to add a weed barrier (weeds can damage your fake grass) and an artificial grass sub-base . Typically, this is a mixture of gravel and sand, like crushed miscellaneous base (CMB) or decomposed granite. If you're placing turf over concrete, you can skip the sub base and use a padded underlayment.