One smart move I made when planting my Winter garden was to mix my radish seeds and my carrot seeds together. I used Easter egg radishes and Chanterey carrots for the garden, which are both known for their mild flavor. I also favored the Chanterey carrots because they are short, and thus suited for raised beds that might not have as much soil depth as some gardens.
But why did I mix the seeds together in the same row? What's the advantage, you ask? Well, radishes mature in only a month, which means that once you pull them, your carrots, which take at least twice as long to mature, will have more room to spread out and grow. Also, since the soil has been loosened, the carrots will have an easier time growing. Just make sure to pull out your radishes gently; you don't want to pull out your baby carrots before their time!