Wonke ama-brassinolides okwamanje asemakethe angahlukaniswa abe izigaba ezimbili ngokombono wobuchwepheshe bokukhiqiza: i-brassinolide yemvelo kanye ne-synthetic brassinolide.

I-S-abscisic acid inemiphumela yempilo enjengokubangela ukuthi amahlumela amile, ukuchitheka kwamaqabunga kanye nokuvimbela ukukhula kwamaseli, futhi yaziwa nangokuthi "ihomoni elele".

Yatholwa cishe ngo-1960 futhi yaqanjwa ngephutha ngoba yayihlobene ukuwa kwamaqabunga ezitshalo. Kodwa-ke, manje sekuyaziwa ukuthi ukuwa kwamaqabunga ezitshalo nezithelo kubangelwa i-ethylene.

I-Trinexapac-ethyl ingeye-cyclohexanedione plant growth regulator, i-gibberellins biosynthesis inhibitor, elawula ukukhula okunamandla kwezitshalo ngokunciphisa okuqukethwe kwe-gibberellins. I-Trinexapac-ethyl ingamuncwa ngokushesha futhi iqhutshwe yiziqu zezitshalo namaqabunga, futhi idlala indima ephikisana nokulala ngokunciphisa ukuphakama kwesitshalo, ukwandisa amandla esiqu, ukukhuthaza ukwanda kwezimpande zesibili, nokuthuthukisa uhlelo lwezimpande oluthuthuke kahle.

I-Paclobutrazol iyi-ejenti yezolimo engenza buthaka inzuzo ephezulu yokukhula kwezitshalo. Ingamuncwa izimpande zezitshalo namaqabunga, ilawule ukusatshalaliswa kwezakhi zezitshalo, yehlise izinga lokukhula, ivimbele ukukhula okuphezulu kanye nokwelulwa kwesiqu, futhi ifinyeze ibanga le-internode. Ngasikhathi sinye, ithuthukisa ukuhlukaniswa kwezimbali, ikhulisa inani lezimbali, ikhuphule izinga lokumiswa kwezithelo, isheshise ukuhlukaniswa kwamaseli.