
Cloche Hoops covered with Fleece
In December daylight levels are at their lowest ebb and even if you have installed a heater, you won’t see a huge difference in the growth rate of your Polytunnel plants. However, another thing you shouldn’t see is frost damage, even without protection of a fleece cloche.

Winter on the Allotment
December is when you can really begin to notice a difference between the Polytunnel raised beds and those outside. Inside the Polytunnel you could have fat, juicy lettuces, beetroot, mustard seeds, pak choi and more….but you won’t find any of those outside at this time of year! This is what Polytunnel growing is all about. It’s easy enough to grow vegetables of all kinds outside during the summer, but to have your own walk-in larder of fresh organic vegetables at this time of year is downright special.
When, for instance did you last pick a salad in December? If you don’t have a Polytunnel, you would probably need to live somewhere far south of the UK to do so – but if you do have a Polytunnel, you could live in the North of Scotland and still be able to pick lettuce right the way through the winter.

Broad Beans in a Polytunnel
Broad beans and peas sown earlier may be taller than 30cm by now, and it could be difficult to cover them with fleece if frosts threaten. While winter varieties of both are hardy enough to withstand sub-zero temperatures, if a cold snap is set to continue you may nevertheless need to provide some additional protection. It’s quite possible that peas will flower and even produce pods in December. If this happens, remove (and eat!) them to prevent the plant getting the message that it’s all over. They will then continue to pod in the spring….
If you need to water, try to do so early in the day. Avoid wetting the leaf surface, as on overcast days the Polytunnel will stay cool and evaporation is a t a minimum. If the leaves are still wet when nights comes, this could result in frost damage!

Order your Seeds!
Top Tips for December – Keep everything well ventilated, whenever it’s possible, open the doors for a few hours even on overcast, cool days. Only if it’s really cold should the Polytunnel remain closed…….Order yours seeds! Take time to sit down and work out what you would like to grow next year..
Clear up debris regularly and often. Left alone it will quickly become a source of mould, a habitat for pests, or both!
Don’t neglect watering. Even though plants require far less water during the winter the beds shouldn’t dry out.
What to Sow in your Polytunnel in December
Coriander, Broad Beans, Winter Lettuce, Mangetout Peas, Rocket.
© Mark Gatter 2011
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