Cut flower export sounds like climate travesty; they are not essential, they are fragile (requiring energy-intensive cold chain logistics and air-freight) and after all that effort... they have a shelf-life of a week. If there is an industry that should be strictly localized, it's this one.
The argument I regularly hear is that there would be more energy spent heating local greenhouses than flying the flowers.
The skies in summer here are criss-crossed with dispersed contrails. It might help a little with global warming by increasing the reflectance of the atmosphere but it's sure ugly.