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f there was an award for a garden that’s given the most back to nature, Knepp Castle’s walled garden in West Sussex would be a likely contender. ‘We took out the lawns, put in layers of sand, limestone and crushed concrete from demolished farm buildings, created wet hollows, sunny banks and sandy areas, and unleashed a vast plant genome with 2,000 different taxa,’ explains the award-winning landscape architect Tom Stuart-Smith. Three years later, the 1.5-acre garden’s invertebrate biodiversity had increased