One of the most common questions asked by novice vegetable and herb gardeners is “How many?” That is, how many of each plant to put in, so that the harvest will be enough to make dinner but not so much that you’re frantically trying to find homes for a major surplus. When you plan an ornamental border, there are design guidelines that talk about groups and masses and specimen plants, but food gardens (although they can be beautiful) are not planted with aesthetics primarily in mind. So how to make these choices?

You can find plenty of guides online for, say, planning a garden for a family of four. These tend to assume that your garden is large and that you want to supply all or most of your needs from it. Which is great if that’s your goal, but I don’t find that many of the busy urban and suburban gardeners I talk to mean to skip the supermarket produce section entirely. The online guides will also measure the planting in feet of row; if you grow in the square footage of raised beds, you’ll have to do some recalculation. Growing in these kinds of high volumes probably also requires food preservation, whether by freezing, canning, or some other method.

Most of us find the answer to “How many?” through trial and error, and frankly you probably can’t avoid that entirely. You’ll err on the side of not enough for some plants, and too much for others, and will serve some salads featuring a handful of lettuce or one small cucumber, or get to know your neighbors when you have tons of extra tomatoes. But there are ways to plan.

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