Abstract
The vase life of cut flowers and effects of various chemicals was examined with the help of a pulse treatment. According to the results using of chemicals (preservatives, disinfectants as well as blocking of synthesis of ethylene) is ineffective if it is used after seeding This shows the great importance of harvesting time.
 Using 8-HQS or l-MCP + 8-HQS proved to be the best for vase life in most of the samples. Using these materials did not prevent the appearance of air bubbles in the stems and absorption could be observed continuously.
 To examine the tissue structure reaction of chemicals stems were stained with toluidin-blue, and high of absorption was measured. It was found that in cases, when absorption was bad, small air bubbles blocked the xylem vessels.
 All the species examined (Aster linosyris, Achillea collina, Aster novi-belgii, Inula britannica, Solidago canadensis, Inula ensifolia, Senecio jacobea) show similar reactions to chemicals because they are the members of the same family.
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