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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.

Yes, weeds will grow through pea gravel but you can prevent this during the installation process. Install a weed barrier underneath pea gravel and swap it out every three years to keep weeds at bay.

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. 

Like sugar, the common household staple baking soda has uses in the yard. Baking soda boosts your plants to resist pests, fungal growth, and more. So, baking soda is good for your plants in certain instances, but exercise caution, as using too much could kill your plants. It’s great for hunting for pesky weeds, but not great for tending to a sensitive garden.