What can I grow in a cold frame in the UK?
Cold frames protect hardy crops down to around -5°C without heating. Lamb’s lettuce, winter purslane, corn salad, and overwintered broad beans all thrive inside a cold frame through a typical UK winter. In severe frost below -5°C, add horticultural fleece over the plants for extra insulation. Position south-facing against a wall: This captures maximum sunlight and the wall radiates stored heat back overnight, keeping frost at bay. Year-round salads: Lamb’s lettuce, winter purslane, and mizuna crop through December under a cold frame.
When to use a cold frame in the UK?
In late spring and summer, use coldframes and mini-greenhouses to provide extra warmth for tender summer crops, such as aubergine, tomatoes and chillies. This encourages quicker ripening and a larger crop. These structures can also be used for propagating plants. Greenhouses: Greenhouses are the most common alternative to cold frame gardening. Bigger in size and better at retaining high levels of heat, greenhouses allow you to grow a wider range of plants and crops no matter the weather or time of year. Greenhouses can also be heated externally and used for garden storage.
Is a cold frame as good as a greenhouse?
Though cold frames offer much better protection from outdoor conditions, they do have limits and aren’t capable of keeping ideal temperatures for plants all year round. For instance, they can’t support tender plants or winter crops as well as a greenhouse can. I had two problems with the cold frame plants. They were packed in there too tight and I had to bring them out of the frame to spread them out. The hay bales made good shelving though for them to sit on. And I had problems with caterpillars.
Will plants be ok in an unheated greenhouse?
If you grow the correct vegetables, layer your greenhouse, and offer superior insulation, you will not need any heater to create your garden. It is not possible to make a cold Greenhouse completely safe from freezing if outside temperatures fall substantially below 0 degrees centigrade – tender plants will be at risk.
Should a cold frame be in sun or shade?
Place your cold frame in a sunny spot where it will get at least 6 hours of direct sunlight per day. Make sure the site is level, and choose a location that is sheltered from cold winds. Cold frames that you can buy online can be very light so secure it with something heavy like a couple of bricks or peg it down. Build your frames so that they slope slightly from top to bottom and orient them toward the south, so that they take best advantage of the sun’s winter angle. For best results, choose a location that has good drainage.
What are the disadvantages of a cold frame?
There are a few drawbacks to cold frame gardening. Some cold frames are too small and so unable to hold many plants, while others are simply too big and take up too much room. Cold frames also do not get as warm as greenhouses or retain heat as well, and so are not suitable for some plants. You can put your cold frame on pretty much any surface so long as it’s flat and sturdy. As it’s used to house pots, rather than covering anything growing directly in the ground, concrete or paving slabs make an excellent base.