October 2014 issue of the Cornell Flower Bulb Research Program Research Newsletter:
Readers of this newsletter and followers of the Flower Bulb Research Program are aware that we (Cornell) have been working on ethephon (Florel, Collate) drenches as a height control technique for spring bulbs. The January 2014 Newsletter has a great deal of information on ethephon drenches for narcissus and hyacinth. While still not labeled, we do anticipate that drenches will become labeled for Collate in the reasonably near future.
Read the whole article. Starts on page 6.