The growing season is nearly over for Treasure Valley gardeners. Recent sub-freezing temperatures have seen to that. If you grow herbs and want to save them, here’s guide for next year.
1. Gather equipment.
Begin by gathering your harvesting equipment. Use sharp garden clippers so you don’t mangle the stems. Clean cuts mean less chance for disease to get a foothold on the plant. Have something to carry the clipped herbs: A bucket, a large basket or paper grocery bags will do the trick.
Wear sturdy garden gloves. We recommend the ones with stretch knit fabric and rubberized palms. They combine safety with flexibility.
2. Start snipping.
Go out to the garden and start snipping stems. This is best done during the cooler hours of the day. Herbs harvested midday are less likely to be at peak flavor.
Perennial herbs such as oregano and thyme are the simplest to harvest. Cut about one-third to one-half of the plant’s height anytime during the growing season. Removing too much can stress the plant. Clip the stem just above a leaf node to encourage future growth.
Basil, chervil and other annual herbs grown for their leaves also can be harvested periodically during the garden year. In fact, regular harvesting throughout the year will encourage fresh growth and give you a larger total amount of the herb. As with perennials, only clip about a third to a half of the leaves on the herb.
Gathering dill, fennel, caraway and other seed-producers requires more careful timing. Watch for the seeds to plump and turn brown. Clip the heads immediately or you’ll lose your harvest to hungry birds or high winds.
Harvest edible herb flowers such as lavender, borage and pot marigold when the flowers have just opened. The heads will be firm and at maximum flavor.
For all your herbs, harvest only parts that are in good condition. Leaves, seeds or flowers that are damaged or wilted won’t improve after they’re clipped. Avoid harvesting from plants that are stressed or struggling to stay alive. Because green leaves are the energy-producing part of the plant, removing too many can be harmful.
3. Bring herbs indoors.
Bring the cuttings indoors for the next step. Leafy herbs need a quick bath to remove any dust and dislodge most garden insects. Fill the sink or a dishpan with water. Dip the herbs in the water, and swish them around a bit. Then lift them out of the water (leaving the debris behind) and shake slightly to allow excess water to drain off. Place on a cotton towel and pat dry.
4. Dry carefully.
The fourth step to preserving is the drying. Lay large stalks in a single layer on an absorbent towel or screen placed on a flat surface. For small-leaved, short-stemmed herbs such as thyme and winter savory, place the stems loosely in a bowl.
Allow them to air-dry for six to eight days – more for thick-leaved herbs such as sage and rosemary. When the leaves are crackly dry, remove them from the stems.
When drying herbs, it’s important to prevent mold. Each day during the drying, fluff or stir the herb stalks to expose new parts to the air. If you live in a humid area or are drying a large quantity, consider using a small fan to aid air circulation.
Some gardeners prefer to hasten the drying process with the microwave oven. The microwave will work, provided you dry a handful at a time in short bursts – no more than a minute at a time.
Larger quantities will tend to cook like spinach, leaving you with a fragrant microwave and a mushy mess.
We don’t recommend using a conventional oven to dry herbs. Many ovens have a minimum setting of 200 F. The essential oils that provide flavor and fragrance in herbs are volatile at temperatures of 150 F and above. Using your oven will drive out those essential oils and give you less flavorful dried herbs.
5. Store correctly.
To store dried herbs, remove leaves, seeds and flowers from the stems once they are crackly dry. Place them whole (not crushed or ground) in airtight, wide-mouth jars with screw or snap tops. Keeping them whole while stored will maximize the preserved flavor. Label with the contents and date of harvest and store in a cool, dark place.
That’s all there is to it.
You can count the rules of herb harvesting on one hand: Use sharp clippers and sturdy gloves. Harvest stems, seeds and flowers from healthy plants. Give them a quick bath. Dry them quickly. Store dried herbs away from light and moisture.
With these hints, you can clip with confidence. Next time you’re struck with the need to harvest, you’ll know just what to do.