Heavy clay soils benefit the most from the addition of sand but they are also the hardest to blend. Buds taste like cheese with a distinct earthy undertone, and with 0. As for the medium, we always recommend growing in a light, well-aerated, slightly acidic soil with a pH of 6.  Source: <a href=http://www.shalomisrael.org/?p=22223>http://www.shalomisrael.org/?p=22223</a>