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.
Isle Of Gigha
Colonsay is an island in the Inner Hebrides of Scotland, situated north of Islay as well as south of Mull. The ancestral residence of Clan Macfie and the Colonsay branch of Clan MacNeil, it is in the council location of Argyll and also Bute as well as has a location of 4,074 hectares (15.7 sq mi). Straightened on a south-west to north-east axis, it determines 8 miles (13 km) in size and reaches 3 miles (4.8 km) at its widest point. The island's population was 124 as recorded by the 2011 census an increase of nearly 15% since 2001 when there were 108 normal homeowners.