Growth retardation

Stem extension growth is controlled by auxins produced by the plant and also by gibberellins that can dramatically increase stem length, especially when externally applied. Growth retardation may be desirable, especially in the production of compact pot plants from species that would normally have long stems, e.g. chrysanthemums, tulips and Azaleas. Therefore, artificial chemicals, such as daminozide (Figure 11.7), which inhibit the action of the growth promoting hormones can retard the development of the main stem and also stimulate the growth of side shoots to produce a bushier, more compact plant. Flower production may be inhibited but this can be countered by the application of flower stimulating chemicals.

Untreated

Treated

Figure 11.7 Chemical growth retardant is incorporated into compost used for pot plants such as chrysanthemum

Untreated

Treated

Figure 11.7 Chemical growth retardant is incorporated into compost used for pot plants such as chrysanthemum

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