Preserving Herbs by Dehydration
Dehydrating herbs is a matter of removing moisture without cooking the volatile oils out of the leaves. By using low-heat air circulation, you stop biological activity and lock in the concentrated essence of the plant for use long after the growing season ends.
Consistency is your primary goal.
Pick herbs early in the morning after dew evaporates but before the midday sun draws out their oils. Ensure every leaf is bone-dry to the touch before you begin the process.
- Dehydrator trays or wire cooling racks
- Parchment paper
- Kitchen shears
- Airtight glass jars
The Temperature Threshold
Keep your dehydrator at 95°F to 105°F. Anything hotter will bake the herb, turning the leaves brown and killing the aromatic compounds that define the flavor.
The method.
Clean and sort
Gently rinse herbs under cool water to remove grit. Shake off excess moisture and lay them on a lint-free towel for an hour. If a leaf looks wilted or brown, discard it.
Prepare the trays
Strip leaves from woody stems like rosemary or thyme. For tender herbs like parsley, leave the sprigs intact. Spread them in a single, thin layer so air can circulate underneath every leaf.
Dehydrate
Set your machine to the lowest setting. Most herbs take between 4 and 8 hours. They are finished when the leaves are brittle and crumble into dust at the slightest pressure of your thumb.
Condition and store
Place the dried herbs in a glass jar, leaving it unsealed for 24 hours to let any residual moisture escape. If you see condensation on the inside of the glass, they need more time in the dehydrator.
When it doesn't go to plan.
Use a fine mesh screen if your dehydrator trays have large holes to prevent small leaves from falling through.
Store dried herbs in a cool, dark cupboard to prevent light from degrading their color and strength.
Label your jars with the date; dried herbs generally maintain their best character for one year.
The ones that keep coming up.
Can I use an oven instead of a dehydrator?
Yes, but keep it on the lowest possible setting with the door propped slightly open to allow moisture to escape. Watch them closely, as ovens can create hot spots that scorch leaves.
Should I wash the herbs?
Only if they are visibly dusty or have been exposed to soil splash. Washing introduces moisture, which increases the total drying time.
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