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.
Shaftesbury
Shaftesbury is a community as well as civil parish in Dorset, England. It is situated on the A30 road, 20 miles (32 kilometres) west of Salisbury, close to the border with Wiltshire. It is the only substantial hill negotiation in Dorset, being constructed about 215 metres (705 feet) over sea level on a greensand hill on the edge of Cranborne Chase. The community evaluates the Blackmore Vale, part of the River Stour basin. From different viewpoints, it is feasible to see at the very least as for Glastonbury Tor to the northwest. Shaftesbury is the site of the former Shaftesbury Abbey, which was founded in 888 by King Alfred and also became one of the wealthiest religious facilities in the country, prior to being ruined in the Dissolution in 1539. Adjacent to the abbey site is Gold Hill, a high cobbled street used in the 1970s as the setting for Ridley Scott's television advertisement for Hovis bread. In the 2011 census the town's civil parish had a population of 7,314.