Drying mulberry leaves for tea is straightforward and requires no special equipment. You can air dry them, use a food dehydrator, or use your oven on its lowest setting. The key is keeping temperatures low, ideally between 95°F and 130°F, to preserve the compounds that give mulberry leaf tea its health benefits.
When to Harvest the Leaves
Pick mulberry leaves in late spring or early summer when they’re young, bright green, and tender. Younger leaves have higher concentrations of beneficial compounds and produce a smoother, less bitter tea. Harvest in the morning after any dew has evaporated but before the midday heat, which can wilt the leaves and reduce their quality.
Choose leaves that are free of insect damage, discoloration, or mildew. Give them a quick rinse under cool water to remove dust or debris, then pat them completely dry with a clean towel. Any residual moisture slows the drying process and invites mold.
Three Methods for Drying
Air Drying
This is the simplest approach and costs nothing. Spread leaves in a single layer on a clean drying rack, screen, or baking sheet lined with parchment paper. Place them in a warm, dry room with good airflow, out of direct sunlight. A fan pointed nearby helps circulate air and speeds things up. Expect air drying to take anywhere from 3 to 7 days depending on humidity. The leaves are done when they crumble easily between your fingers with no flexibility or moisture left.
You can also bundle small stems together and hang them upside down in a well-ventilated area. This works but takes longer than laying leaves flat, since air doesn’t reach both sides evenly.
Food Dehydrator
A dehydrator gives you the most control. Set it to 95–115°F (35–46°C), which is the standard herb setting on most models. Arrange leaves in a single layer on the trays without overlapping. Drying takes 3 to 8 hours depending on leaf thickness and your specific machine. Check every hour or two after the 3-hour mark and pull leaves as they become crisp and brittle.
Oven Drying
If you don’t have a dehydrator, your oven works in a pinch. Research on mulberry leaf drying kinetics found that temperatures of 40–50°C (104–122°F) are the most suitable range for preserving leaf quality. Set your oven to its lowest temperature. If that’s 170°F or higher, prop the door open a few inches with a wooden spoon to let heat escape and moisture vent out. Spread leaves in a single layer on a parchment-lined baking sheet and check every 30 minutes, rotating the tray for even drying. Oven drying typically takes 1 to 3 hours. Watch carefully toward the end, because leaves can go from perfectly dry to scorched in minutes.
Why Low Temperatures Matter
Mulberry leaves contain a compound that helps slow sugar absorption after meals, which is one of the main reasons people drink the tea. Research on this compound’s heat stability shows it remains intact at temperatures up to 100°C (212°F) but degrades significantly at 150°C (302°F). So the gentle drying temperatures used in all three methods above are well within the safe zone. The real risk isn’t chemical degradation at normal drying temps. It’s scorching the leaves, which destroys flavor and turns the tea bitter and flat.
Mulberry leaves also contain antioxidants that help neutralize free radicals in the body. These compounds are sensitive to prolonged heat exposure, which is another reason to keep temperatures low and drying times as short as practical.
How to Store Dried Leaves
Once your leaves are fully dry, crumble them into smaller pieces or leave them whole, depending on your preference for brewing. Transfer them to an airtight container. Glass jars with tight lids, sealed tin canisters, or vacuum-sealed bags all work well.
A study published in Molecules tested different storage methods for dried mulberry leaves over 30 days and found that vacuum packaging was the most effective way to preserve both nutrient content and antioxidant activity. Vacuum sealing at room temperature actually outperformed non-vacuum storage in the refrigerator. If you have a vacuum sealer, this is the ideal approach. If not, an airtight jar stored in a cool, dark cupboard will keep your tea in good shape for 6 to 12 months. Avoid paper bags or loosely sealed containers, as oxygen exposure accelerates nutrient loss.
Regardless of your container, keep the tea away from direct sunlight and moisture. A pantry shelf works better than a countertop near the stove.
Brewing Mulberry Leaf Tea
Use about 1 level teaspoon (roughly 3 grams) of dried leaves per 8-ounce cup. Bring filtered water to a boil, then let it cool for a minute or two to around 194°F (90°C). Pour over the leaves and steep for 3 minutes. Longer steeping produces a stronger, slightly more astringent flavor, so adjust to your taste after trying it once at the baseline.
The tea has a mild, earthy flavor that some people compare to green tea but without the caffeine. Mulberry leaf tea is naturally caffeine-free, making it a good option for evening drinking. You can blend it with mint, ginger, or a small amount of honey if you want more complexity.
Health Benefits of Mulberry Leaf Tea
The most studied benefit is blood sugar regulation. Both animal and human studies have shown that mulberry leaves help reduce blood sugar spikes after meals by slowing the breakdown of carbohydrates in your gut. A review in PMC covering multiple clinical trials confirmed this effect, noting measurable reductions in post-meal blood glucose levels. This makes it a popular tea among people managing their blood sugar through diet.
Beyond blood sugar, research has identified antioxidant, anti-inflammatory, and cholesterol-lowering properties. Mulberry leaves have demonstrated protective effects against several cardiovascular risk factors, including high blood pressure and arterial plaque buildup, in preclinical studies. While the human evidence is still building for some of these benefits, the blood sugar effects have the strongest clinical backing.
Possible Side Effects
Mulberry leaf tea is generally well tolerated. Studies lasting up to 12 weeks have reported no serious adverse effects, according to the National Institutes of Health. The most common complaints are digestive: bloating, gas, constipation, or loose stools, especially when starting out or drinking large amounts.
If you take medication for diabetes, be cautious. Because mulberry leaves lower blood sugar on their own, combining them with diabetes drugs could push your levels too low. Little is known about safety during pregnancy or breastfeeding, so most sources recommend avoiding it during those times.