The recent shift to milder temperatures is a pleasant reminder that it is time for gardeners to plant cool-season vegetables, said . Warm days and cool nights make conditions ideal for a second round of cool-season vegetables, said University of Missouri Extension Horticulture Specialist David Trinklein. These crops most often are more flavorful than a spring garden of the same species. First, pull spent plants, clean debris and weed the garden. This helps to prevent insects and diseases that tend to be drawn to fall gardens more than spring gardens. Some gardeners use floating row cover to keep insects away, Trinklein says. Row cover is an inexpensive translucent and breathable polyester fabric found at many garden centers. Next, work the soil lightly and, if needed, add a general-purpose garden fertilizer such as 5-10-5 or 12-12-12 before planting. The need for additional fertilizer depends largely on the vigor of the species previously growing in the space. Lettuce, beet, kale,…