If you want to improve flower shoots in roses, then you should bend some of the shoots. The presence of bent shoots increased plant photosynthesis by 73% to 117%, whereas it did not affect photosynthesis of upright shoots,” say Nigyi Zhang and colleagues in their paper Quantifying the contribution of bent shoots to plant photosynthesis and biomass production of flower shoots in rose (Rosa hybrida) using a functional-structural plant model. “[M]odel simulations of photosynthesis revealed that the increased upright shoot dry weight (by 35% to 59%) in plants with bent shoots was entirely resulting from the contribution of additional photosynthesis by bent shoots, as this was the only assimilate source that could induce differences in upright shoot growth apart from their own photosynthesis.”