Soil Mixture

Aside from the amount of sunshine the herbs will be receiving on a daily basis, you also have to consider the soil wherein you would plant your herbs.  Any herb will grow in good garden soil.  That is what you basically need.  Neutral soil is best for herbs, with a pH of about 6.5 or 7.  More so, extremely fertile soil is not really good for herbs.  In fact, in very fertile soil, what happens is that herbs produce excessive foliage which results in less flavor.

If you are planting outside, cultivate the topsoil and mix it with organic matter.  If there is only a thin layer of topsoil covering hard subsoil, remove the topsoil first and then break up the subsoil first, mixing it with organic matter as well.  After that, put the topsoil back.

For potted herbs, do not use garden soil but instead use potting soil.  You can get this at any gardening store.  In order to further ensure that the potting soil will not be too rich for the herbs, try mixing it with perlite.  This material lightens the potting soil as well as helps root growth and drainage.