Answer: For growing herbs in containers, I'd recommend using 1 part potting soil, 1 part peat moss and 1 part composted manure. Topsoil is too heavy and carries harmful diseases to be used in containers. Plus, herbs love well drained soil and topsoil will compact easily, stopping water and air drainage. Potting soil contains peat moss, vermiculite amnd perlite- natural rock substances that aid in drainage. Topsoil doesn't contain these.
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