Help with Warszewiczia propagation please.

Tried this question on the Propagation forum with no luck.
I have a Warszewiczia coccinea (double form) that has grown to about 6 feet in height in a large pot over the last 3 years. I have taken multiple cuttings from it but so far I have been completely unsuccessful in propagating it. Some of the cuttings remain green for several weeks but there has been no sign of any root formation whatsoever and the cuttings eventually go brown and dry. I have tried new wood, old wood, tip cuttings etc. to no avail and although it flowers profusely it never has seeds that I can identify. I have not tried root cuttings. I have had moderate success with the single form with about 20% of old wood cuttings producing plants. Can anyone give suggestions for successful propagation of this form?

I checked the listing in Plant Files: http://davesgarden.com/guides/pf/go/57570/ but see no propagation information for this plant.

This says propagation from cuttings: http://en.wikipedia.org/wiki/Warszewiczia_coccinea but does not specify old, new wood etc.

Here it says soft stem cuttings in sand medium: http://www.sibis.com/Charity/Garden_Club/GG_Documents/Articles/Johnny%20Lee/Double%20Chaconia/GC_Double%20Chaconia.htm

Thanks plantladylin -
I too saw this one and it mentions it is difficult to propagate because of the fragility of the "fine roots". Unfortunately I have never seen roots, fine or otherwise, develop on my cuttings. Perhaps there is someone out there from Trinidad and Tobago who has actually propagated it who can tell me the secret(s)!

I wonder if it just happens to be one of those plants that take a long time to produce roots? Have you used any type of rooting hormone powder to see if that would stimulate root production?

Yes, I have tried the powdered stuff and cloning gel. I have also tried cuttings in my Ez cloner chamber to no avail.

The best time to propagate Warszewiczia is right after the plant's new flush of growth in the spring.

Take softwood cuttings that are just starting to show a brownish bark.

The cuttings should be in a well drained medium such as sand, perlite, or vermiculite, and kept moist and in the shade.
They should have no direct sun on them and hot dry wind must be avoided.
They react well to high humidity. Having them in a humid greenhouse, and misted several times an hour would be optimal.

Warszewiczia is an understory plant of rainforests. Having them in a sheltered, moist area, with an organically rich soil and humid atmosphere will assure their success.

Thanks Metrosideros.
What percentage of your Warszewiczia cuttings are successful?