A four-year crop rotation splits your crops into four groups by plant family and moves each group to a new bed every year. After four seasons, each group returns to its starting spot. Every section of your garden gets three full years of different crops before the same family comes back.
I run a four year rotation plan in my own garden using four raised beds. In year one, Bed A grows beans and peas. Bed B gets tomatoes and peppers. Bed C holds cabbage and broccoli. Bed D produces carrots and onions. Each spring, everything shifts one bed clockwise. Beans move to B, nightshades go to C, brassicas head to D, and root crops land in A. By the time beans return to Bed A in year five, that soil has had three full seasons of rest from legumes.
The four year crop cycle beats shorter rotations for disease control. Most soil fungi need two to three years to die without a host plant. A two-year rotation gives only one year of gap. That's not enough to kill off stubborn problems like clubroot or Fusarium wilt. Four years gives three seasons without the target family. That's enough time to wipe out most disease and nematode pressure before the same crops return to a bed.
The NRCS says every rotation cycle should include at least one crop that helps the soil. In a four-year system, legumes fill this role. Beans and peas fix nitrogen from the air through root bacteria. They store 20-40 pounds of nitrogen per acre in the ground. The crop that follows gets this nitrogen for free. Smart gardeners put their heaviest feeders right after the legume year. This clockwise shift means each bed gets a fertility boost at the right time.
Bed A Legumes First
- Year 1 crops: Bush beans, pole beans, snap peas, or sugar peas that fix nitrogen into the soil for free.
- Soil effect: Adds 20-40 lbs nitrogen per acre and creates root channels that boost drainage for years.
- Next up: Nightshades move in the next year to use all that stored nitrogen for heavy fruit growth.
Bed B Nightshades Second
- Year 1 crops: Tomatoes, peppers, eggplant, or potatoes that need lots of nitrogen for fruit growth.
- Soil effect: These heavy feeders use up most of the nitrogen legumes stored, pulling the soil back to neutral.
- Next up: Brassicas arrive next and prefer the moderate fertility that nightshades left behind.
Bed C Brassicas Third
- Year 1 crops: Cabbage, broccoli, kale, or cauliflower that grow best in moderate, balanced soil.
- Soil effect: Brassica roots release compounds that help hold back soil fungi, cleaning the bed for the next group.
- Next up: Root crops fill this bed next to work the deeper soil and finish the cycle on low demand.
Bed D Root Crops Fourth
- Year 1 crops: Carrots, beets, onions, garlic, or turnips that feed light and break up packed subsoil.
- Soil effect: Deep roots pull minerals up from lower layers and build structure that helps the next crop.
- Next up: Legumes come back to start the cycle fresh with nitrogen fixing in loose, well-built soil.
I tested this exact layout for several seasons and the results speak for themselves. My beds that followed legumes grew the tallest, greenest plants every single time. The beds at the root crop stage had the loosest, most workable soil. Each position in the cycle does a specific job. The whole system runs itself once you set it up and shift everything one spot each spring.
Setting up your own 4 year garden rotation takes about fifteen minutes. Draw four boxes on paper, label them A through D, and assign each one a crop family. Pin this chart where you'll see it every spring. Each year, shift the labels one spot clockwise. This simple system keeps your soil healthy, starves out pests, and feeds every bed the right nutrients at the right time. Your four-year crop rotation becomes the backbone of your garden plan. It's long enough to break disease cycles but simple enough to run without any fancy tools or software.
Read the full article: Crop Rotation: Guide to 38% Higher Yields
