Yes, your shed does need a base. This is to give it a solid, level foundation. Open soil will not help with the longevity of the shed itself or the contents within. The best materials to use to make your shed base are concrete, natural stone or wood.
Bruton
Bruton is a village, selecting ward, and civil church in Somerset, England, on the River Brue along the A359 between Frome and Yeovil. It is 7 miles (11 kilometres) south-east of Shepton Mallet, just south of Snakelake Hill and also Coombe Hill, 10 miles (16 km) north-west of Gillingham as well as 12 miles (19 kilometres) south-west of Frome in South Somerset area. The community as well as ward have a population of 2,907. The parish consists of the communities of Wyke Champflower and Redlynch. Bruton has a gallery of products from its past from the Jurassic onwards. It includes a table made use of by the author John Steinbeck to compose on throughout a six-month stay in Bruton. The River Brue has a history of flooding. In 1768 it damaged a rock bridge. On 28 June 1917, 242.8 mm of rain fell in 24 hours, leaving a water mark on a bar 20 feet above the regular level. In 1984 a protective dam was developed 1 km upstream from the community.