Zombies are docile when adorned with flowers.

Settlements overgrown with herbs and flora.

Barely any banditry; everyone is focused on farming and gathering.

Different human factions and towns named after flowers like Lilies, Orchids, Roses, etc.

It’s incredibly risky to attack zombies. The scent of the attacker’s aggressive intent coupled with spilled pungent rotten blood drives other zombies into a frenzy.

Zombies given funeral rites grow flowers within their bodies, eventually bursting from their chest and head area. These zombies are naturally gentle and their presence tames other zombies in the vicinity. Due to their helpfulness, it’s taboo to harm “blooming” undead:

Sweaty summers are the worst and everyone hopes they have enough dried flowers to last the winter. 

It’s a colourful apocalypse! An overabundance of flowers in the world leads to plenty of dyes and busy little honey bees!! Scented candles are a thriving export.

Survivors who help spread flowers, look after “blooming” undead, cull the hordes, and herd zombies away from safe areas are affectionately called Florists.

Regular weapons such as guns and knives are still used but everyone prefers perfumed water guns, spray bottles, and incense.