Which component of floral preservative is intended to stop germ/bacteria growth?
Answer
The biocide or germicide.
Floral preservatives typically include a biocide specifically designed to inhibit the growth of bacteria and fungi within the water solution to prevent clogging the plant's system.

Related Questions
What is the main reason vase water is unsafe to drink?Which component of floral preservative is intended to stop germ/bacteria growth?What function does the sugar component serve in flower food?What is the recommended action if a child accidentally drinks a significant amount of vase water containing flower food?What defines the safe, intentional preparation of 'flower water'?Why must caution be taken when identifying blossoms for infusion?What is the typical result of accidentally ingesting only a small drop of water containing flower food?Which source of flowers should generally be avoided for making edible infusions?What risk is primarily mitigated by using clean, filtered water daily for home-grown flowers instead of chemical food?Which flower is explicitly mentioned as a prime candidate for creating flavored, sweet water, often with lemon?