![Organic Sourdough Starter 10g, Bread Matters](http://www.theurbangrocery.co.uk/cdn/shop/files/organicsourdoughstarter_{width}x.jpg?v=1696504437)
The Bread Matters Sourdough Starter is rye flour and water in which naturally-occurring yeasts and bacteria have developed and been nurtured over quite a few years. Wholemeal rye flour is especially rich in these micro-organisms, which is why, if you want to maintain only one sourdough starter, it makes sense to make that a rye one. Vegan. Organic.