When I studied medicinal herbs, the rule of thumb was that the more herbs were allowed to fend for themselves (poor, dry soil), the stronger the herbs were. Is it in full sun? Not fertilized? Kept on the dry side (but don't let it wilt)?
Also, I pick mine (for drying) before it puts any energy into flowers. I try to catch it just as the stems start to elongate, before any flowers start forming.
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