Early most mornings, there is dew. The dew makes the leafy greens, such as arugula and mizuna, too damp to harvest. The dew usually lifts gradually; sometimes, if there is wind, it lifts quickly. Leafy greens are best harvested as the dew is lifting, especially on windy days, when the leaves can quickly go from too wet to too dry (prone to wilting). This transition from too wet to too dry might take 20 minutes in wind...continue reading.