MISC@1 growers have found that planting corms deep and in rows spaced NUMBER@1 -- NUMBER@2 cm apart optimizes thread yields , whereas planting depths of NUMBER@3 -- NUMBER@4 cm optimizes flower and corm production .

Growers have found that planting corms deep and in rows spaced NUMBER@1 -- NUMBER@2 cm apart makes more threads , whereas planting depths of NUMBER@3 -- NUMBER@4 cm makes more flowers and corms .
