Can I Plant Tomatoes Where Potatoes Have Been?

Tomatoes and potatoes both belong to the Solanaceae family of plants, and as such, can be susceptible to many of the same diseases and pests. This can lead some gardeners to wonder if planting tomatoes where potatoes have previously grown is a good idea.

Potato and Tomato Diseases

Both potatoes and tomatoes can be affected by diseases such as late blight, which can remain in the soil for several years after the initial infection. Planting tomatoes in soil where potatoes have been recently grown can increase the risk of disease transmission. However, it is important to note that not all potato diseases affect tomatoes, and vice versa. Gardeners can take steps to reduce the risk of disease transmission by rotating crops, disinfecting tools before use, and choosing disease-resistant varieties.

Solanaceous Crop Rotation

Crop rotation is a common technique used by gardeners to maintain soil health and reduce the likelihood of disease and pest problems. Rotating solanaceous crops, such as potatoes and tomatoes, can be particularly effective in reducing disease transmission. Ideally, gardeners should wait at least two years before replanting tomatoes or potatoes in the same location. This allows time for any disease organisms in the soil to die off or become less active.

Amending Soil After Potatoes

If you do decide to plant tomatoes in soil where potatoes have recently grown, there are steps you can take to reduce the risk of disease transmission. First, remove any remaining potato tubers or plant material from the soil. Then, add organic matter such as compost or well-rotted manure to improve soil health and fertility. This can help to revitalize the soil, reduce the risk of soil-borne disease, and improve tomato plant growth and yield.

Disease-resistant Varieties

Selecting disease-resistant tomato varieties can also help to reduce the risk of disease transmission. Look for varieties that are resistant to common tomato diseases such as verticillium wilt, fusarium wilt, and late blight. These varieties are often labeled with an “F” or “V” to indicate their resistance to specific diseases.

Conclusion

In summary, planting tomatoes where potatoes have been grown is possible, but can increase the risk of disease transmission. Taking steps to rotate solanaceous crops, amend soil after potatoes, and select disease-resistant varieties can help to reduce this risk. As always, good garden practices such as proper watering, fertilization, and pest control can also be helpful in maintaining healthy tomato plants.