An Avocado mattress does not need a box spring. In fact, we do not recommend using a box spring. Firmer, non-yielding surfaces are better suited for your Avocado Mattress. Using a box spring with an Avocado Mattress can make it feel too springy.
That said, an Avocado Mattress can work with a box spring. Read our tips on how best to use your new mattress with a boxspring here.