I plant these at the end of may and here in the north you dig them up for the winter and store the bulbs.
Select a sunny planting location.
Prepare the soil, if necessary, by incorporating ample organic matter. Soil preparation is not always necessary if drainage is good.
Dig holes 3 to 6 inches deep. Plant larger corms at the deeper end of the range. Leave 2 to 4 inches between corms.
Place the corm in the hole, root side down (you should see remnants of last year's roots on the bottom, and the top is often cupped). The bottom of the corm should rest firmly on the bottom of the hole.