Pi ant propagation is an activity that most greenhouse owners find rewarding and to which, ultimately, they devote much tune. Attention to detail is what distinguishes the successful from the less successful in tins field. Even the most adept gardener is likely to fail unless he maintains the highest standards of hygiene in the greenhouse, for seeds and young plants are very susceptible to .1 variety o! diseases. Propagation usually requires heating to temperatures above the 'cool* greenhouse level of 7 t'(4s F). This can, of course, be localized (so saving hearing bills) it you have a propagating case, which you can either buy or make yourself
Special composts arc available for propagating purposes. In the John limes range the seed compost is less coarse than the potting mixtures, while cutting composts usually contain a greater proportion of sand to improve soil aeration. In addition, there is a number ot proprietary cutting composts which in themselves have little or no food value but provide ideal conditions tor root initiation it is important to realize that the environment in which a plant is propagated can alfect its performance not only during the first few weeks and months but throughout its life. For example, lettuce plants raised with supplementary lighting during the winter months will ultimately develop lettuces with more leaves per plant than those raised at ordinary light levels; and tomato plants that were raised at temperatures somewhat lower than the optimum 20 C (6y F) commonly have a smaller vield on the first three trusses,
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