Drying ginkgo leaves is straightforward: spread them in a single layer in a warm, dry spot out of direct sunlight, and wait until they’re completely crisp. The whole process takes roughly one to two weeks depending on humidity, though you can speed it up significantly with an oven or food dehydrator. The method you choose affects how well the leaves retain their beneficial compounds, so it’s worth picking the right approach for your goals.
When to Harvest for Best Results
The timing of your harvest matters more than the drying method. Ginkgo leaves contain the highest concentration of active compounds, particularly flavonoids, in autumn as they shift from green to gold. The ideal window is when leaves begin turning golden, typically in October in most temperate climates. You can collect them directly from the tree at this stage or gather freshly fallen leaves that still look clean and intact.
Avoid picking leaves that are brown, spotted with mold, or visibly damaged by insects. If you’re collecting from the ground, do so within a day or two of the leaves falling. Wet, decomposing leaves on the ground will not dry well and may harbor bacteria. Rinse your harvested leaves gently with cool water, shake off excess moisture, and pat them dry before starting the drying process.
Air Drying at Room Temperature
Air drying is the simplest method and requires no special equipment. Spread the leaves in a single layer on a clean screen, drying rack, or sheet of parchment paper. The key conditions are a room temperature of roughly 70 to 75°F (21 to 23°C) and moderate humidity between 30 and 50 percent. Keep the leaves out of direct sunlight, which can degrade their active compounds, though indirect light during part of the day is fine.
Flip or shuffle the leaves every couple of days to promote even drying. You’ll know they’re done when they feel completely dry and brittle, snapping cleanly rather than bending. This typically takes 7 to 14 days depending on leaf thickness and room conditions. In humid environments, air drying takes longer and carries a higher risk of mold, so consider running a fan nearby or choosing a different method if your home stays above 50 percent humidity.
One trade-off to be aware of: research comparing drying methods found that air-dried ginkgo leaves retained somewhat lower levels of biflavones (a key group of beneficial compounds) compared to oven-dried or freeze-dried leaves. Air drying still works, but if preserving maximum potency matters to you, a low-heat oven or dehydrator is a better choice.
Oven Drying for Faster Results
An oven speeds the process to just a few hours. Set your oven to its lowest temperature setting, ideally between 150 and 170°F (65 to 75°C). Spread the leaves in a single layer on a parchment-lined baking sheet, making sure none overlap. Prop the oven door open slightly with a wooden spoon to allow moisture to escape and prevent the temperature from creeping too high.
Check the leaves every 30 minutes, rotating the tray for even heat distribution. Most batches finish in two to four hours. The leaves should be completely crisp and crumble easily between your fingers. If they still feel leathery or pliable, they need more time. Be cautious with temperature: going above 180°F risks scorching the leaves and breaking down the very compounds you’re trying to preserve.
Using a Food Dehydrator
A food dehydrator gives you the most consistent results because it circulates warm air evenly and lets you set a precise temperature. Place the leaves in a single layer on the dehydrator trays, set the temperature to around 95 to 115°F (35 to 46°C), and let it run. This lower temperature range mimics gentle air drying but with continuous airflow, which reduces drying time to roughly 8 to 12 hours.
If your dehydrator has an herb setting, use that. Check a few leaves after 8 hours. They should be papery and snap crisply. Thicker leaves or higher humidity in your kitchen may push the timeline closer to 12 or even 16 hours.
Storing Dried Ginkgo Leaves
Proper storage protects your dried leaves from moisture, light, and air, all of which degrade their quality over time. Once the leaves are fully dry, transfer them to an airtight glass jar or a resealable bag with as much air pressed out as possible. Store them in a cool, dark place like a pantry or cabinet.
You can keep leaves whole for tea or crafts, or crumble them into smaller pieces for easier measuring. Well-dried ginkgo leaves stored in a sealed container away from heat and light will keep for about a year. If you notice any musty smell or visible moisture inside the jar within the first few weeks, the leaves weren’t dry enough. Spread them out and continue drying before resealing.
A Note on Ginkgolic Acid
Raw ginkgo leaves contain ginkgolic acid, a naturally occurring compound that can cause allergic reactions and stomach irritation in some people. Commercial ginkgo supplements are processed to contain less than 5 parts per million of ginkgolic acid, a safety threshold set by the U.S., European, and Chinese pharmacopeias. Home-dried leaves do not go through this purification step, so they will contain higher levels of ginkgolic acid than standardized supplements.
Drying does reduce some toxic compounds found in ginkgo plant material, but it does not eliminate ginkgolic acid entirely. If you plan to use your dried leaves for tea, keep your intake moderate. People with plant allergies, particularly to poison ivy or cashew shells (which belong to the same botanical family as ginkgolic acid compounds), may be more sensitive. Handling fresh ginkgo fruit pulp can also cause skin irritation, so wear gloves if you’re harvesting near fallen fruit.