Plant Spacing & Layout

Crop Rotation Planner

Tell the planner what grew in each bed this year and get a colour-coded 4-year rotation schedule that keeps families moving, feeds the soil, and avoids disease.

What grew in each bed this year?

How to use the crop rotation planner

Choose how many beds you have, then tell the planner which plant family grew in each bed this season. Press Generate Rotation Plan and you will get a colour-coded four-year table: beds run across the top, years run down the side, and each cell shows the family to plant there. The plan only ever uses the crops you already grow — it simply moves them around your beds so no family sits in the same spot for too long. Any rule conflicts are listed below the table so you can adjust your starting layout.

The six plant families

Rotation works at the family level because relatives share the same pests, diseases, and feeding habits. This planner uses the six groups most home gardeners deal with:

  • Nightshade: tomato, pepper, eggplant, potato.
  • Brassica: broccoli, cabbage, kale, cauliflower.
  • Legume: beans, peas.
  • Root vegetable: carrot, beet, onion, garlic.
  • Cucurbit: cucumber, squash, zucchini, melon.
  • Leafy green: lettuce, spinach, chard.

The rotation rules behind the plan

A good rotation is more than just "don't repeat yourself". The planner follows a handful of time-tested rules: never follow a nightshade with another nightshade; place nitrogen-fixing legumes just before heavy feeders such as brassicas and nightshades; follow leafy greens with root vegetables; and take advantage of strong pairings like cucurbits after legumes and nightshades after legumes or cucurbits. It checks both rotation directions and keeps the one that satisfies the most rules.

Why rotation protects your soil and your harvest

Growing the same crop in the same place year after year is an open invitation to trouble. Pests and diseases that specialise in one family build up in the soil, and the plants steadily strip out the particular nutrients they favour. Rotation interrupts both problems at once. Moving a family away for three or more years starves its specialist pests and pathogens, while alternating deep-rooted, shallow-rooted, leafy, and fruiting crops spreads the demand on soil nutrients and structure. Adding legumes to the cycle even returns nitrogen to the bed for the next crop.

Getting the most from your rotation

Keep a simple record each season so you remember what went where — this tool makes that easy with a copy and print option. Combine rotation with compost or other organic matter to keep fertility topped up, and do not forget that herbs, flowers, and cover crops can stand in as a restful break year in any bed. The more beds you have, the longer the gap between repeats, so even adding one extra bed can meaningfully improve plant health over time.

Frequently Asked Questions

What is crop rotation and why does it matter?

Crop rotation means growing plants from different families in a given bed each year instead of repeating the same crop. It matters because soil-borne pests and diseases that target one family build up when that family stays put, while different crops draw on and replenish different nutrients. Rotating breaks pest and disease cycles, balances soil fertility, and usually means healthier plants with less intervention.

How many years should a crop rotation last?

A three to four year cycle is the common standard, which is why this planner builds a four-year schedule. The goal is to leave at least three years before any plant family returns to the same bed, because that is long enough for most family-specific pests and diseases in the soil to die back. Longer rotations are even better if you have the space and the number of beds to support them.

Why should legumes come before tomatoes and brassicas?

Legumes such as beans and peas host bacteria that capture nitrogen from the air and leave some behind in the soil. Heavy feeders like tomatoes, peppers, and the cabbage family use a lot of nitrogen, so planting them after legumes lets them tap into that stored fertility. The planner tries to line up legumes just ahead of those hungry crops wherever your starting layout allows.

Why can I not plant nightshades in the same spot two years in a row?

Nightshades — tomatoes, peppers, eggplant, and potatoes — are vulnerable to soil-borne problems such as early blight, verticillium, and various wilts, plus pests that overwinter in the soil. Replanting them in the same bed gives those problems a fresh host right where they already are. Waiting a few years starves the pathogens out, which is why the planner flags any back-to-back nightshade placement.

What if I only have two or three beds?

You can still rotate, just on a shorter cycle. With two beds, families return every other year; with three, every third year. The planner handles two through five beds and warns you when a short rotation means crops come back sooner than ideal. If you can add even one more bed, each family gets a longer, healthier break from its pests and diseases.

Do flowers, herbs, or cover crops count in the rotation?

They can help. Many herbs and flowers belong to none of the main vegetable families, so a bed of them effectively gives the soil a rest year and disrupts pest cycles. Cover crops, especially legumes like clover or vetch, add organic matter and nitrogen. This planner focuses on the six main vegetable families, but you can treat a flower, herb, or cover-crop year as a useful break in any bed.

More Tools to Explore

Companion Planting Checker Best and worst plant pairings Open tool → Square Foot Garden Planner Plants per square foot, any bed size Open tool → Planting Calendar When to plant by ZIP code Open tool →

GardenCalc Editorial Team

Horticulture Writers & Master Gardeners

Our calculators and guides are written and fact-checked by gardeners with hands-on experience in vegetable production, soil management, and home landscaping.