no
Depends how quickly you want them to die. Never use salt. Sprite is a great floral food.
Salt does not spoil, does not require refrigeration.
Salt is used to absorb moisture from the flower, hence 'dried flower'. By absorbing the water, the rate of decomposition of the flower is significantly reduced allowing the dried flower to last longer.
Maybe because salt serves as a preservatives when added to water that is why flowers stays fresh longer. Same thing when preserving foods, salt plays an important factor.
only perineals
no
Malians used salt to make there food last longer.
Silk flowers or artificial flowers will be just fine. Not only can they be more expensive than fresh cut flowers or arrangements but will of course last longer.
I can't find any evidence that this would make them last longer. In fact I can't find any evidence of anyone putting flowers in a water & batteries mix.
To make a bouquet of flowers last longer, trim the stems at an angle, change the water every few days, keep them away from direct sunlight and heat, and add flower food to the water.
soapy water
Salt, sugar, vinegar, drying or freezing