Check with your mattress manufacturer to find out the recommended support for your mattress. Some manufacturers say that you can place your natural latex mattress on a box spring if it is in good condition, however, the weight of the mattress could eventually make the box spring bend and “sag.” Most organic latex mattress manufacturers we work with require that your natural latex mattress be placed on a proper foundation or platform bed such as not to void the warranty.
To summarize, if you have a platform bed, you can place any type of mattress directly upon it without using a foundation or box spring. If you have a traditional bed frame, you would need a box spring or foundation to place your mattress on. Innerspring mattresses are traditionally used with a box spring, but will work fine with a foundation. It is best to pair a latex mattress with a foundation or a platform bed, but some manufacturers may allow you to place a natural latex mattress directly on a box spring provided it is in good shape.
Original post published June 29, 2010, post edited April 13, 2022.