I understood the principle of hugleculture is to create fertile soil over a period of time - i.e. once the carbon source (logs) have properly composted then the new soil can be spread over the site so growing annuals rather than perennials or trees makes sense on a huglekulture bed - obviously the created feature will also perform many other functions i.e. windbreak, growing space, ecosystem, offer differing aspects,capture and hold moisture etc - as others have mentioned Sepp has both the resources, space and climate - he can also use it, on his extreme slopes, as a way of reducing erosion. Another thing to consider is height of the water table - if the logs become submerged in water then there is a danger of over acidifying the soil. The Lawton approach seems to be more consistent with a small farm scale use of energy and available resources - they are making an awful lot of compost whereas Sepps approach has been to design using a minimum - for me it would be about taking the design approach and weighing the desired functions of each element/system and weighing that against the available resources, climate and zones.