Answer: You can grow iris in a 2 or 3-gallon container. The rhizomes should be planted just below the soil surface. Expect the roots to penetrate the soil to a depth of 8"-12". Lily-of-the-Valley will grow in a slightly smaller container; one-gallon will accommodate one or two plants. Bluebells can be grown in an 8" - 12" container.
Use commercial potting soil or a mixture of potting soil and garden soil for your plants and check daily during the summer months. Plants in pots can dry out quickly when the weather gets hot.
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