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Agar plate. An agar plate is a Petri dish that contains a growth medium (typically agar plus nutrients) used to culture microorganisms or small plants like the moss Physcomitrella patens. Selective growth compounds may also be added to the media, such as antibiotics.
Therefore, we recommend a plain nutrient agar. Ready-to-use petri dishes with nutrient agar can be purchased directly from Carolina Biological. Common Types of Agar. Different types of agar are used for growing different strains of bacteria. Generally, an experimental procedure will tell you what type of agar to use. If you are still unsure, ask a teacher or consult our Ask An Expert forum. Not all types of agar are good for students to use unsupervised at home.