EPIGENETIC SIGNALS. “Flowering plant development is wholly reliant on growth from meristems, which contain totipotent cells that give rise to all post-embryonic organs in the plant. Plants are uniquely able to alter their development throughout their lifespan through the generation of new organs in response to external signals.”
https://bmcbiol.biomedcentral.com/articles/10.1186/1741-7007-3-12