This section is from the book "The American Garden Vol. XI", by L. H. Bailey. Also available from Amazon: American Horticultural Society A to Z Encyclopedia of Garden Plants.
I have a cold frame for daisies, pansies, and violets, and always have a grand show in early spring. The violets and pansies bloom more or less during mild winter weather, and it is seldom that there are more than four or five weeks during the winter in which I do not gather a few flowers from either the pansies or violets; and when early spring comes the plants are covered with bloom, including the daisies. The cost of the frame per year is but little, and the trouble but a small item, for I give them but little attention after winter sets in.
I usually start my plants in July, and when well established set them in the cold frame, where they remain unprotected until severe winter weather sets in, when the sashes are put in place. No other protection is given. On bright warm days we raise the sashes and give the plants air. While all the above plants are hardy with us (that is, young plants), I find that a slight protection gives earlier flowers. - J. Oliver Wadlon, Md.
 
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