It’s an ancient tradition to rotate crops, because it didn’t take modern science for farmers to realize that growing the same thing in the same place every year wasn’t working so well. It’s widely accepted now that the longer your crop rotation, or the more time between growing the same family of plants in a specific place, the more healthy and balanced your soil and plants will become. There’s also generally accepted principles of which plant families “follow” each other best. Like onions work well following potatoes, and potatoes follow brassicas, meaning that each year it’s best to plant onions where last year there were potatoes and potatoes where there were brassicas, etc.

These things aren’t ironclad rules at all, and some people still say tomatoes do best if you don’t move them, but much of the reason crop rotation is really effective is the way different plant families interact with the soil. So corn for example, guzzles nitrogen from the soil, but legumes (beans, nuts, peas, clover grasses) take nitrogen from the air and store it in the ground, so they can replenish what the corn takes (or leave a good deal for the corn to eat up.) Other plants need other micronutrients (like Phosphorus or other metals) in higher amounts so they’ll do better in other places.

And there’s the even more pivotal result of crop rotation: pest and disease control. Growing tomatoes in the same place year after year, you’re bound to get some nematodes that love not having to move to find more roots to munch. And try keeping your squash anywhere near where cucumber beetles have been, or your potatoes in a place the Colorado Potato beetle knows to look. Devastation would result! And usually, just moving something 10 or 20 feet away will actually confuse bugs enough that they don’t find their food and die off.

We have a very good 10 year rotation plan (meaning nothing will be back to the same plot until it’s been 10 years since the last time they were there.)  That’s thanks to the wonderful planning and foresight of our garden manager Sarah, with some help from Eliot Coleman’s New Organic Grower. In the book, Coleman details how to plan your crop rotation, what follows what best, and goes into a lot more detail than I have here.

And while we were going through this years crop rotation plan, we also happened to name all of the fields after famous agriculturalists. I will be writing up some information about each of our fields and why the people they’re named after are important in the coming weeks. Look forward to it!

-Joe Ingrao EXCEL Scholar Spring 2015