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Step 1
Be able to pinpoint problems with the herbs. They you'll often see stunted growth, sooty black substance on leaves, yellow spotting or the presence of a powdery mildew.
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Step 2
Supply them with a strong spray of close-range watering. This will dislodge some of the causes, like white flies. It will also spray clean any of the damaging substances that might be clinging to the leaves.
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Step 3
Encourage green lacewings, ladybugs or chalcid wasps to the plants by planting sunflowers, scented geraniums, yarrow or angelica. They will naturally tend to your herbs, as well, and serve as a good, natural repellant to many of the unfriendly herb pests.
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Step 4
Capture pests with commercial sticky traps or make your own by coating yellow-painted boards with honey or Tangle Foot (a commercial sticky substance available at garden centers).
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Step 5
Monitor your watering. Overwatering can often stunt or damage growth. Curling or wilting leaves can often mean, not that the herd is undernourished, but overwatered.
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Step 6
Dislodge or uproot the plant entirely. This is only in extreme cases of infestation or when rot has set in. Do this to either start over with new herbs or prevent the spread of harmful external elements.
