Square Jiffystrips®. Square coir based pots make the perfect seed starting container. The square pots have a slightly larger volume and are better suited for larger seeds / seedlings. The coir fiber has massive water storage capabilities along with providing support for your own custom germination mix. Even better the Livingseeds Germination Mix is perfect for use with these pots. Jiffystrips® have 6 cavities per strip.