Should You Lime Soil Before Planting Potatoes?

Liming soil before planting potatoes is a topic that often causes confusion. While lime is commonly used to improve soil conditions for many crops, potatoes have specific needs, and adding lime at the wrong time can cause more harm than good.

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Do Potatoes Like Lime?

Potatoes prefer slightly acidic soil, ideally with a pH between 5.0 and 6.5. Lime raises soil pH, making it more alkaline, which is not ideal for potatoes and can increase the risk of certain diseases.

Why Liming Before Planting Potatoes Is Usually a Bad Idea

Adding lime shortly before planting potatoes can lead to several problems:

• Increases the risk of potato scab
• Encourages rough, blemished skins
• Reduces tuber quality
• Can interfere with nutrient uptake

Potato scab thrives in alkaline soils, and fresh liming creates the perfect conditions for it to develop.

When Lime Might Be Necessary

Lime should only be considered if your soil is very acidic (below pH 5.0).

• Confirm soil pH with a soil test
• Apply lime well in advance — ideally 12–24 months before potatoes
• Use only the minimum amount required

Even then, it’s often better to grow potatoes elsewhere in the rotation.

Best Practice for Potato Soil Preparation

Instead of liming before planting, focus on:

• Adding well-rotted compost to improve soil structure
• Using balanced or potato-specific fertilisers
• Maintaining even moisture levels
• Avoiding fresh manure

These steps support healthy growth without raising soil pH too high.

What About Liming After Potatoes?

Lime is best applied after harvesting potatoes, especially if the following crop prefers neutral or alkaline soil, such as brassicas. This fits well into a traditional crop rotation system.

Containers and Grow Bags

Never add lime to compost used for potatoes in containers or grow bags. Most composts are already balanced, and adding lime can quickly push pH too high in confined spaces.

Signs Your Soil May Be Too Alkaline

• Frequent potato scab
• Poor tuber skin quality
• Nutrient deficiencies despite feeding

If these issues appear, avoid lime altogether for future potato crops.

Final Thoughts

You should generally avoid liming soil before planting potatoes. Potatoes grow best in slightly acidic conditions, and liming too close to planting greatly increases the risk of scab and poor-quality tubers. If lime is needed, apply it long before potatoes are grown or after the crop has been harvested as part of a sensible rotation plan.