Yes, it stunts its growth and could kill it. But 5-7 percent alcohol in water works fine for some bulbs (e.g. paperwhite narcissus and hippeastrum), reducing flower stems tallness without affecting leaves or flowers size.
It is unlikely that saliva will kill flowers because it is mostly water.
Alcohol does not kill brain cells.
Alcohol does not kill pubic lice. They must be killed with insecticide.
Alcohol can kill you on the spot if you drink a huge amount of alcohol, drink grain alcohol in large amounts, or are allergic to alcohol. Allergies to alcohol can cause throat swelling and an inability to breathe.
Petroleum products such as diesel fuel, kerosene or gasoline will kill any plant, including flowers.
No
There are chemicals in soap that can harm not just flowers but animals too. Flowers need soil, water, sunlight, and air to live. Not BATHS from soap. It WILL kill the flower. It will kill the flower whether it is cut or not.
Yes
no! it will kill them
Yes, it can kill a plant within weeks. Do no try to water a plant with rubbing alcohol unless you expect to kill it.
Rubbing alcohol will kill just about anything it comes in contact with. Apply liberally.