<span style='font-size:12pt;line-height:100%'>Here is some additional info about Redwood Bark in a quote from this link: http://www.disas.com/con1999-12.htm BTW, Disa orchids are terrestrial and sympatric (grow side-by-side in the same environment) with Drosera capensis and other South African CP:
Check out this link about the culture of Disa orchids, doesn't it sound familiar?</span>Disa Orchid Culture
[b said:Quote[/b] ]4. Redwood bark
Several California orchid growers, and Disa growers specifically, have had great success using shredded redwood bark in their medium for Disa cultivation. Redwood is well known for its excellent resistance to decay, and John Larimer prompted me to find out what constituents were responsible. So I contacted a chemist who specialises in natural products, and this is what he came up with: "It's the oils. Redwoods, cedars and others contain a complex mix of terpenes, propylphenol and propylphenol ethers (lignites). Many have antibacterial, antifungal, antioxidant properties." Maybe these oils in the bark help Disa plants by keeping root rotting fungi at bay. The oils are presumably also a major factor in why redwood burns so easily.
That's all for this issue.
Check out this link about the culture of Disa orchids, doesn't it sound familiar?</span>Disa Orchid Culture