[header] How to build a mason jar herb garden [title] Get a set of mason jars that are at least 4 inches (10 cm) deep. [step] Ordinary glass mason jars can be purchased inexpensively at most supermarkets and home good stores. Pick up as many jars as you think you'll need to contain a garden of the size you have in mind. 
Mason jars are often sold in sets, which can simplify the process of collecting them. [substeps] Most mason jars come in either quart or pint sizes, which can be useful if you're planning on growing more of one type of herb than another.