Walnuts are typically harvested in the fall when the outer husk begins to split open and the nut inside is mature. This usually occurs between September and November, depending on the variety of walnut tree. It is important to wait until the husk has started to split open before harvesting to ensure the nuts are fully developed and ready to be eaten. Therefore, if the walnuts are showing signs of maturity and the husks are starting to split, it may be a good time to harvest them now. **

Grape leaves are typically harvested in the late spring or early summer when they are young and tender. Harvesters carefully select leaves that are free from damage or disease. The leaves are picked by hand, ensuring that the stem is left intact to make it easier to roll or stuff the leaves later on. After harvesting, the leaves are washed and blanched before being used in various culinary dishes. **

Comfrey can be harvested throughout the growing season, typically from late spring to early fall. It is recommended to harvest comfrey before it flowers for the best quality and potency of the plant. **

Savoy cabbage is typically harvested in the late fall or early winter. It is a cool-weather crop and is best harvested before the first frost. The leaves are at their peak flavor and tenderness when harvested at this time. It is important to harvest savoy cabbage before the weather becomes too cold, as freezing temperatures can damage the crop. **

Yes, millet can be harvested when the seeds have fully matured and the plant has turned golden brown. This typically occurs around 70-90 days after planting, depending on the variety and growing conditions. It is important to monitor the crop and test the seeds for maturity before harvesting to ensure the best quality yield. **

It is difficult to determine if the onion was harvested too early without more information. Factors such as the variety of onion, growing conditions, and intended use can all impact when an onion should be harvested. Generally, onions are ready to harvest when the tops have fallen over and started to dry out. If the onion was harvested before reaching this stage, it may have been harvested too early. **

Black tomatoes can be harvested when they are fully ripe, which is typically when they have a deep, dark color and are slightly soft to the touch. This can vary depending on the specific variety of black tomato being grown, but generally they are ready to be harvested in late summer to early fall. **

Mandarins are typically harvested in the late fall and winter seasons. **