Maria Thun (24 April 1922 – 8 Feb 2012) was a market gardener from Germany whose became a key figure in contemporary Biodynamics as both an author and consultant. She also developed Barrel Compost, a spray which can be used an alternative to or supplement for Biodynamic compost itself.
Maria Thun, Results from the biodynamic sowing and planting calendar (Floris Books, 2003).
Bernard Jarmann, ‘Maria Thun. An Appreciation,’ Star & Furrow, 117 Summer 2012, p.17-21