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lightweight frames that can be lifted and moved from an early spring crop to a more tender crop planted slightly later in the season.
Fall is also a good time for sowing some cool-weather crops in frames. If provided with adequate moisture and fertilization, most cool-season crops will continue to grow through early winter in the protected environment of a cold frame.
Depending on the harshness of the winter and whether or not additional heating is used, your frame may possibly continue to provide you with fresh greens, herbs and root crops throughout the cold winter months.
The frames can be built from a variety of materials, with wood and cinderblocks being the most effective, if wood is selected, us one that will resist decay such as a good grade of cypress. Wood frames are not difficult to build; however, it is also possible to buy kits which can be easily assembled.
There is no standard sized cold frame. The dimensions of your frame
will depend on your situation —amount of available space, desired crops, size of available window sash and permanency of the structure.
Remember not to make the structure too wide for weeding and harvesting — 4 to 5 feet is about as wide as is convenient to reach across. The sash of the frame should be sloped slightly to the south to allow maximum exposure to the sun’s rays. Management of the coldframe is quite simple if a few basic rules are followed.
Insulation may be necessary when a sudden cold snap is expected. A simple method is to throw burlap sacks filled with leaves over the sash on the frame at night to protect against freezing.
Ventilation is most critical in the late winter, early spring and early fall on clear, sunny days when temperatures rise above 45 degrees. The sash should be raised partially to prevent the build up of extreme temperatures inside the coldframe. Lower or replace the sash each day early enough to conserve some heat for the evening.
In summer extreme heat and intensive sunlight can be avoided by shafting with lath sashes.'*'
Watering should be done early in the day so that plants can be dry before dark to help reduce disease problems.
Intensive planting techniques and good management procedures can yield significant harvests from small areas during times of the year when you never thought it possible to grow a garden.
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