Crop rotation refers to changing where you grow particular crops in a garden. This practice can help you organize growing zones in your 20 Foot Dome Greenhouse, maintain soil nutrients, and reduce risk of certain pests and diseases becoming established near the same crops year after year.

Dividing your greenhouse into different crop groups makes better use of your growing areas without sticking rigidly to the same planting locations throughout the year. Read on to learn how.

Understand the Main Crop Groups

Crop rotation does not need to be complicated. Most vegetables and herbs can be grouped according to their plant family and general growing requirements. Some of the most common crop groups include:

• Leafy vegetables such as lettuce or spinach

• Legumes like peas and beans

• Fruiting crops, such as tomatoes and peppers

• Root vegetables like carrots

These groupings are a helpful starting point, but also try to rotate plants from the same botanical family. Tomatoes, peppers, eggplant, and potatoes are nightshade crops that may have similar pests and disease. Rotating between different plant families is often more beneficial than rotating between different vegetables or herbs.

Divide the Greenhouse Into Growing Zones

Your greenhouse has 314 square feet of floor space for growing vegetables and other plants. Divide that area into growing zones based on how you intend to plant crops in each season.

For example, you may have several raised beds and paths to access the beds for planting, harvesting, and caring for plants. Divide your greenhouse into sections that make sense for your particular setup. Label each section with the crop group you intend to plant there for the current season.

If you have four compatible beds or zones in your greenhouse, consider designating each zone for a different crop group. Track where each crop grows from year to season so that you can rotate them to a new bed later on.

Keep pathways clear so that you can reach plants on either side to provide care and store supplies. If you plan to grow crops in containers, label each container or keep a diagram that shows where they are located.

Create a Simple Rotation Schedule

Crop rotation works best when you plan before planting each season. Write down what you planted where during the previous season, then pick a crop group to rotate into each bed or growing zone for the current planting cycle.

For instance, you might plant tomatoes in one growing bed during season one. After harvesting tomatoes and removing plants from the bed, you could plant a leafy crop like lettuce in that space during the next suitable planting season. Another bed could have hosted beans before rotating to spinach or another crop group.

Every crop rotation is different because it depends on your climate, calendar of growing seasons, and the crops you wish to grow. Some gardeners rotate crops every season while others plan several years in advance, rotating crops every three or four years.

Rotating crops is especially helpful for vegetables and herbs that tend to develop problems from certain soilborne pests and diseases. There is no single ideal rotation schedule because it depends on the crops you intend to rotate and the size of your growing space.

Rotate small groups of beds or individual planting zones when one planting cycle ends and it’s time to plan what you will grow next. You don’t need to change all of your crops at once.

Manage Soil Nutrients Between Rotations

All plants use up nutrients in the soil, but different plants need varying amounts. Tomatoes, for example, are heavy feeders that do well with nutrients managed properly. Beans and peas host nitrogen-fixing bacteria in their roots that can benefit garden soil, but they do not automatically replenish every nutrient depleted by previous crops.

Examine your soil or growing medium before adding a new crop group to the rotation. Add aged compost or other soil amendments if needed. Perform soil tests when practical to gauge nutrient levels and pH, but avoid adding fertilizer based on the needs of last season’s crop.

Don’t apply fertilizer without knowing the needs of your next crop. Extra nutrients can lead to lush foliage with little fruit or vegetables in some planting zones. Proper soil care will support strong plant growth all season long.

Reduce Pest and Disease Risk

Planting the same crop group in the same greenhouse bed repeatedly causes some pests and diseases to go from bad to worse. Rotating crops can help break pest life cycles and limit the severity of certain diseases.

Tomatoes, peppers, and eggplant should not follow each other in the rotation if you have suffered from damaging diseases in previous years. Rotate nightshades with unrelated crops and practice good garden hygiene by disposing of diseased plant materials rather than adding them to your compost pile.

Crop rotation will not prevent every pest or disease problem in your greenhouse garden. Some fungi survive in soil for many years. Others can spread on water droplets or wind. Vegetable garden pests can affect multiple parts of the plant and sometimes multiple plant families.

Rotate crops with sensible greenhouse gardening practices like providing good ventilation, using clean garden tools, watering carefully, and inspecting plants throughout the season.

Plan Ahead for Seasonal Conditions

Crop rotation provides some flexibility in where you plant certain crops, but you cannot escape seasonal growing conditions. Temperatures, hours of daylight, and humidity can affect how well plants grow at certain times of the year.

Maintain a planting calendar that tracks when each crop was planted, when it is transplanted or harvested, and removed from the growing bed. Once one crop is finished for the season, decide if the next crop group is suited to the space and present weather conditions.

Quick growing crops like radishes or some leafy greens may plant in between slower growing crops if their needs are not drastically different. Growing cover crops may be another option if a bed will remain empty for an extended period. Choose varieties that match your climate and planting dates based on your local conditions.

Keep Records and Improve Your Crop Rotation Plan

Use a garden journal to track your crop rotation plans. Make note of which crop family was in each bed, when you planted, and if pests were more or less troublesome than usual. Was there evidence of a nutrient deficiency? Perhaps you noticed an especially bountiful harvest.

Review your notes at the end of each growing season before choosing what to plant next in each bed. Perhaps a crop did poorly due to overwatering or cold temperatures. Issues with pests may not disappear unless you choose a different crop next time or correct the cause of the problem.

Don’t get too attached to a detailed crop rotation schedule that never seems to work for your growing space. Some crops will need to be relocated because of extreme weather, family hobbies, or changes to your lifestyle. Aim to rotate crops whenever possible, instead of planting the same vegetables or herbs in the same greenhouse beds each year.

Visit Dome Greenhouses for more information on greenhouse sizes and available accessories.

Final Thoughts

Rotate crops to organize your greenhouse garden and avoid some long-term growing problems. Grouping plants, dividing space into zones, and recording where each crop grows will help you rotate methodically. Incorporate crop rotation into a well-rounded garden plan that accounts for seasonal changes.

Monitor plants for pests and disease, replenish nutrients as needed, and keep growing records so that you can adjust your plan from season to season. Your ideal crop rotation schedule will change as you learn which plants thrive in your greenhouse.

FAQs

1. What is crop rotation in a 20 Foot Dome Greenhouse?

Crop rotation means growing different crop groups in the same bed or growing area over successive planting cycles rather than repeatedly planting the same crops there.

2. Why is crop rotation useful in a greenhouse?

It can help manage soil nutrients and reduce the buildup of certain pests and diseases associated with repeatedly growing the same plant families in one area.

3. Which vegetables should be rotated together?

Vegetables can be grouped by plant family and growing needs. For example, tomatoes, peppers, and eggplants belong to the same family, while lettuce, beans, and carrots belong to different families.

4. How often should I rotate greenhouse crops?

Many gardeners use a three- or four-year rotation where space allows. The best interval depends on the crops grown and the pests or diseases present in the growing area.

5. Can I practice crop rotation in containers?

Yes. Keep track of which crop families grow in each container and change the planting plan between cycles. Replace or refresh growing medium when appropriate, particularly if plants have experienced disease problems.