| 21. | Propagate by seed sown as soon as the seed is ripe into a cold frame.
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| 22. | The name itself exemplifies the distinction between the warm greenhouse and the unheated cold frame.
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| 23. | These include various row-covering techniques, such as using cold frames and garden fabric over crops.
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| 24. | Only about 90 different species made it to adulthood from the greenhouse and cold frames.
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| 25. | A miniature greenhouse is known as a cold frame.
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| 26. | Today, tobacco is sown in cold frames or hotbeds, as their germination is activated by light.
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| 27. | Between them are the foundations of cold frames.
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| 28. | They are best germinated using a cold frame.
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| 29. | It therefore must vary in hardiness, less hardy forms could be grown in a cold frame.
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| 30. | Seeds are then sown in containers in a cold frame in autumn, or between September to May.
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