What you need to make DIY concrete planters shaped like cupcakes
Although the terms cement and concrete tend to be used interchangeably, cement is actually an ingredient of concrete. Concrete is a mixture of aggregates (sand and gravel) and paste (cement and water). For this project, I decided to use a quick set cement or mortar mix. I reasoned that the cupcake moulds are so small I needed a fine-grained blend to be able to pour it into them and pick up the detail of their fluted edge. If I were casting a large concrete planter using a ready mixed concrete would be cheaper and have the benefit of being stronger.
The size cork needed will depend on the size of the cupcake cases. The cases I used measure 50mm at their base and 70mm wide at the top. The cork bungs I used measure 43mm at their narrower end and 50mm at their widest end.