Answer: Peas grow best in cool weather and in your mild winter climate, it's possible to grow them all winter long. But, they can be susceptible to disease under certain growing conditions. Powdery mildew is a fungal disease that attacks plants when environmental conditions are right (warm days, cool nights, some humidity) and air circulation is poor. You can help avoid powdery mildew by giving plants the required exposure to sunshine, and plenty of elbow room so there's good air circulation all around them.
Since you've had experience with powdery mildew in the past, you know how quickly plants can be overtaken. You might be able to stall the effects by picking off infected leaves, but eventually the disease will get the upper hand.
Give your winter pea plants lots of space next year and they won't be quite so susceptible to powdery mildew.
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