A seed coat is the outermost layer of a seed, which is formed from the integuments. Its primary function is to provide a protective layer for the developing zygote, shielding it from adverse external factors. However, recent research has shown that the seed coat also acts as a channel for transmitting environmental cues to the interior of the seed, priming it to adjust its metabolism in response to changes in its external environment. The seed coats integrity is crucial for seed quality and fitness during seed storage or germination. Some pests can penetrate the seed coat of plants, which is why whole grains are particularly attractive to certain species. The seed coat may need to be removed to promote germination, which can be done by soaking the seeds in water or by nicking a hole in the seed coat.