Where to buy petri dishes with agar and bacteria.

Agar, Petri Dishes, and Bacteria

HST is where to buy petri dishes and agar plates for growing bacteria.

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Learn how to use different types of agar to culture bacteria samples in Petri dishes. Plus, experiment with antibiotics and antibacterial agents & see how to grow bacteria.

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You may be wondering where to buy petri dishes with agar, or maybe even: "What is agar?” and "How do I use a petri dish?" Good news—you're in the right place. Pick the product and the price that's right for you! Shop complete kits, prepared agar plates, and read free project ideas. We can help you create the perfect bacteria experiment for your kids—at home or in the lab.

See our Illustrated Bacteria Project Guide for tips and ideas!

So what is agar? It's a gelatinous medium providing nutrients and a stable controlled environment for bacteria growth. Most bacteria will grow well using nutrient agar, but some more fastidious bacteria prefer tryptic soy agar.

To prepare agar plates, just heat and pour into a sterile petri dish. Next, collect bacteria: Swab along any surface to test (your mouth, the bathroom counter, etc.). To culture your microbes, lightly smear the swab in a zig-zag pattern on the surface of the agar plates. Within 1-2 weeks, you should see signs of bacterial growth.

Now you know where to buy petri dishes. But maybe you’re unsure what to add to your cart. We can help with your order!

  • The bestselling Bacteria Growing Kit sets you up with all you need for 20 petri plates (even a step-by-step guide) in one easy set.
  • For further microbiology study, the Gram Stain Kit has everything to test a bacteria sample. Just add bacteria + a microscope!
  • The Microbe Wizard Kit, with teacher & student guides, makes it super-simple to grow and study bacteria.
”We purchased this kit as a fun activity to supplement our regular science program. It came quickly, was high quality, and the kids really enjoyed the experiment.”
                —Customer Review (Bacteria Growing Kit)