Thegreenroofsarenotstrongenoughforthemachinesnormallyusedforlandscaping,soeverythinghasbeendonebyhand–6,000wheelbarrowsfullofsoilandplantsweretrundleduptotheroofoftheNationalArchivesalone.
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The green roofs are not strong enough for the machines normally used for landscaping, so everything has been done by hand – 6,000 wheelbarrows full of soil and plants were trundled up to the roof of the National Archives alone.