I made a modular concrete raised garden bed out of Quikrete 5000. I started by using my X-carve pro by inventables to cut 3/4" MDF into pieces that can be stacked to create a full size prototype.

Likewise, used railroad ties should never be used to construct garden beds for food crops. Different types of stone or ...

Even if you do not have room for a large, in-ground garden, you can add space to grow edibles by using raised beds or containers ... stone and concrete containers. When reusing a container ...