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While you don’t need to put anything down before mulch, you can apply a pre-emergent herbicide to prevent weed growth. As long as you remove weeds before you spread mulch, you should be in the clear. But a herbicide is something that you can put down before mulch as an extra layer of protection.

The cost of 200 square feet of pea gravel depends on how deep your installation will be. The pea gravel material alone costs between $15 and $75 per cubic yard. You'll need just under two yards to cover 200 square feet to a depth of three inches, for a total cost of between $30 and $150.

Pea gravel consists of many small, rounded stones that, unsurprisingly, kind of resemble peas. They range in size from 1/8 to 3/8 of an inch. Higher-end products might be a little more uniform and have fewer jagged rocks in the mix.

Since you’ll likely be digging a trench to install your yard drainage system, this is a good time to complete other tasks that involve digging up your yard, including: Sprinkler system installation Lawn reseeding Regrading your yard Redesigning your landscaping If your drain is under a walkway or driveway, your contractor must also remove those materials. This is a great time to consider upgrading your hardscaping features, especially if they’re nearing the end of their life span.