Many important crop plants are increased vegetatively and grown as clones. They include cassava, potato, sugar cane and many soft (small) fruits and fruit trees . A very large number of herbaceous and woody ornamental plants are also propagated by these means. Suitable methods for vegetative propagation have been developed over many centuries. These traditional 'macropropagation' techniques (or 'macro-methods') which utilise relatively large pieces of plants, have been refined and improved by modern horticultural research. For instance, methods of applying fine water mist to prevent the desiccation of cuttings, better rooting composts and the control of temperature in the rooting zone, have considerably enhanced the rate at which many plants of horticultural or agricultural interest can be multiplied.
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