Some are very slow to start roots , you might try some of the root starter powder mixed with a very tiny bit of vasaline on a tuft of cotton stuck to the base below the leaves of the keiki . This is off the wall but I have picked green willow buds made a paste with a small amount of water and applied it .If you type in Plant Hormones Canada there is a place that sells rooting hormones for orchids , but it would probably take to long to get it . Hope this helps a little . Gin