It's hard to go wrong with garlic or onions!
It seems that the reason garlic is so effective for so many things is due in part to the main ingredient, allicin, which is a complex mixture of substances, mainly allyl sulfides (sulphur).
These are produced by enzyme activity in the bulb, where their balance and effectiveness are dependent upon the presence of assimilable sulphur.
This sulphur is produced in the soil by a number of microorganisms, principally certain tiny fungi (beneficial) that are unable to grow without the presence of humus.
Organically grown garlic, then is believed to be most effective, because that grown with chemical fertilizer does not have enough humus to support the fungi.
The above information was taken from a little book I have called, "Carrots Love Tomatoes," a must have if wanting to learn about companion planting for successful gardening.
Whether planting for yourself, or buying in the store, fresh "organic" herbs are the way to go!
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