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Sweet peas are typically grown as annuals, but they can be overwintered in some areas if you take the proper steps.
First, in autumn, stop deadheading your sweet peas and allow the seed pods to develop and dry on the plant. Once the pods are dry, harvest the seeds and store them in a cool, dry place until the following spring.
Next, cut the sweet pea plants back to a few inches above the soil line, being careful not to damage the roots. Remove any dead or diseased plant material and dispose of it.
Add a layer of mulch around the base of the plant to protect the roots during the winter. In colder areas, you may want to cover the plant with a frost blanket or other protective covering to provide additional insulation.
In the spring, as the weather begins to warm up, remove the mulch and frost blanket and gradually increase watering to encourage new growth. Once the plants have begun to grow again, you can fertilise them with a balanced fertiliser to encourage healthy growth.
It is worth noting that not all sweet pea varieties will survive the winter, so it is important to choose varieties that are known to be hardy in your area if you want to try overwintering them. In addition, overwintering sweet peas is not always successful, especially in areas with very cold winters, so it is best to consider it an experiment and not rely on it for a reliable crop.
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