How many times a year should Isatis root be harvested?

Isatis root is a commonly used Chinese medicinal material derived from the dried roots of the cruciferous plant Isatis indigotica. It has a wide range of medicinal value, is in extremely high demand in the market, and has a promising future for cultivation. So how many times a year should Isatis root be harvested? Let’s learn more about it below.

How many times a year should Isatis root be harvested?

Isatis root can be harvested 2-3 times a year, depending on factors such as variety, growth environment and planting method. Usually in the southern warm climate areas, Isatis indigotica leaves can be harvested two to three times a year; while in the northern areas, Isatis indigotica leaves can be harvested once or twice a year. As for the roots of Isatis, they are mainly harvested after the above-ground part withers in October and November.

How to harvest Isatis root?

1. Leaf harvesting

The first harvest usually takes place around mid-June, when the leaves are green and have reached their maximum growth rate, with fewer yellow and dead leaves, resulting in high yield and good quality.

The second harvest is in early to mid-August, which is the rainy season. Attention should be paid to drainage and waterlogging prevention and prevention of downy mildew.

The third leaf harvest can be combined with the root harvest, which is also the last leaf harvest. The time is around mid-to-late November, and the leaves are harvested one week before digging the roots.

2. Leaves drying

The harvested leaves need to be transported out of the planting area as soon as possible for drying. Lay plastic sheeting or straw mat on the drying yard and spread the leaves evenly on it. The thickness should be 3-5 cm in autumn. Turn the clothes over 2-3 times a day to ensure even drying.

3. Root harvesting

The roots are best harvested in late October to early November. Choose a sunny day to harvest, start digging the roots from one end of the bed, and pick up one plant at a time. Be careful not to dig up the roots, so as not to reduce the quality of the roots.

4. Root processing

After harvesting, isatis root needs preliminary processing. Wash off the dirt on the roots, remove the reed heads, spread them out on tarpaulin to dry until they are 70% to 80% dry, turning them over frequently during drying. After drying, tie the Isatis root into small bundles and dry them until completely dry. Then you can pack them in bags for storage.

In general, Isatis root can be harvested 2-3 times a year, but the specific number of harvests needs to be determined based on factors such as variety, growth environment and planting method. In addition, pay attention to the harvesting distinction between leaves and roots to achieve scientific harvesting and ensure the quality and yield of Isatis root.