Objective: How can I use rocks in my garden?

Which of the following solutions is more sound in terms of naive physics reasoning?

Options are: (1). Rock, gravel, pebbles and other stones can be applied to landscaping features such as flowerbeds to suppress weed growth and retain moisture.; (2). Rock, gravel, pebbles and other bricks can be applied to landscaping features such as flowerbeds to suppress weed growth and retain moisture.;
(1).