Peas are a type of legume, and like all legumes, they contain a high amount of nitrogen. This nitrogen is essential for plant growth, but it can also be harmful if it isn't properly managed. When peas are dried, they lose a lot of their water content. This means that the concentration of nitrogen increases, which can make it difficult for the plants to absorb the nutrient. As a result, it is possible to grow pea plants from dried peas, but it takes some care and attention to ensure that the plants get the nutrients they need to thrive.