Hi! Tony,
It work well. If using tyres, cut the walls out. If you do not cut the wall out of the tyres, you can create a space which becomes a void for the use of rodents/ spiders/ reptiles etc.
Gil - I think that Bob Flowerdew leaves the tyres intact, packing the cavity quite tightly with straw, to provide insulation against frost so that he can get his potatoes extra early. In Britain (especially where I live, in coastal South Wales) we are rarely that bothered about drought but, in some years, we have had severe late frosts. When eucalypts first became popular, people were rather annoyed that varieties described as 'hardy' became badly frost-damaged even in normal winters - until someone found out that, in Australia, 'hardy' means drought-resistant! Thank goodness, we also have less of a problem with spiders and snakes. Tony N-S.
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