You should allow your potato plants to continue to grow and not cut them back. Your plants need to flower to produce potatoes and cutting them back could affect that process. It is best to allow the top growth to die back naturally in anticipation of the harvest so that your potatoes grow to their largest size.
Since your plants are quite tall, you can pile soil around the base to help stabilize them. It will also help protect the potato tubers from exposure to sunlight.
You could pinch out new growth at the ends of the stems to prevent your plants from growing any taller, which will lead to new growth along the stems. The result will be a more bushier plant.
Hi Gary,
You should allow your potato plants to continue to grow and not cut them back. Your plants need to flower to produce potatoes and cutting them back could affect that process. It is best to allow the top growth to die back naturally in anticipation of the harvest so that your potatoes grow to their largest size.
Since your plants are quite tall, you can pile soil around the base to help stabilize them. It will also help protect the potato tubers from exposure to sunlight.
You could pinch out new growth at the ends of the stems to prevent your plants from growing any taller, which will lead to new growth along the stems. The result will be a more bushier plant.
Hope this helps!