Once you are certain the drainage is suitable, it is time to prepare the soil. Soil preparation for culinary herbs is similar for vegetables in that they prefer a light, well-drained, crumbly soil, but most herbs will grow satisfactorily in fairly heavy soil provided there is good drainage. Dig the soil to a depth of about 25 cm (Fig 2), remove all weeds and break up clods to bring the soil to a moderately fine texture. If the soil lacks humus, place 5-10 cm of organic matter, such as straw or compost, on the surface and dig in to spade depth. At the same time, apply animal manure, blood and bone, or a complete fertiliser.