fennel and dill) need time for their underdeveloped ovaries to grow before they can sprout. Other slow sprouters — spinach, for example — have compounds that inhibit germination in their seed ...

Popular garden favourite seeds that require light to germinate include foxgloves, opium poppies, nicotina, lobelia, rosemary, dill, thyme and more,' advises Anya. Meanwhile, calendula, centaurea, ...