Even though we had decent cover crop planting conditions last fall, you may have a field or two that didnât get seeded. You might be asking if itâd be worthwhile to plant cover crops in the spring. There are certainly some scenarios that would make sense if you can work them into your cropping plans in the next few weeks. Planting Window Since you want to maximize growth potential, you need to get your spring cover crops planted as soon as the ground is fit to plant. Target cash crop fields that will be planted later in order to allow time for the cover crops to grow. You may get some weed control or nitrogen from the legume portion of a cover cover mix, but not as much as compared to fall-planted covers. This sets up an ideal scenario to plant your cash crop into a green cover crop, or âplanting green.â