Pea gravel helps amend clay soil, but only to a limited extent. Pea gravel creates temporary spaces for air and water to use to reach plant roots. It does not improve the soil's structure to keep the space open. Only organic material will improve aggregation, aeration and drainage in clay soils.
About this Author
Lee Roberts has written professionally in different capacities throughout her career. She has written for not-for-profit and commercial entities since she received her B.A in sociology from the University of Michigan in 1986. She has been published on eHow.com. She is currently writing an extensive work of fiction.