Daisy is an eleven-year-old girl of English and Iranian descent. She has spent her life traveling the globe with her journalist mother, developing sharp observational skills and an ability to wait patiently. After being sent to a hostile boarding school, she escapes to London and accidentally enters the magical world of the Greenwild. She desperately wants to find her missing mother and struggles to uncover her own plant-based magical abilities.

Leila is Daisy's mother and a nomadic journalist who investigates environmental crimes around the world. She keeps strict secrets about her family's past and the existence of plant magic, preferring to raise her daughter on the road. Her sudden disappearance in the Amazon sets the events of the story in motion.

Mr. Craven is the imposing editor of The High Herald newspaper. He takes a suspicious interest in Leila's unique daisy necklace and drops a detailed map of Peru during their meeting. He pursues Daisy through the streets of London, demonstrating a ruthless drive to capture her.

Artemis is the leader of Mallowmarsh. She lives in a house grown directly into a massive tree and possesses powerful green magic tied to the community's Heart Oak. She warmly welcomes Daisy to the Greenwild and attempts to protect her from the political dangers surrounding the missing Botanists.

Indigo is a young Botanist boy who quickly becomes Daisy's first friend in the Greenwild. He feels insecure about his magical abilities because his talents focus on communicating with animals rather than manipulating plants. He enthusiastically helps Daisy learn the rules of Mallowmarsh and joins her in investigating the missing adults.

Often called "the Prof" by her peers, Eggbertina is an intellectually gifted student who leads the Five O'Clock Club. She feels intense pressure to maintain perfect behavior and earn admission to the elite Bloomquist academy. Her rigid adherence to rules repeatedly clashes with her desire to help find her missing grandfather.

Hal is a lonely boy who spends his time hiding in a secret garden in Mallowmarsh. He struggles with undiagnosed dyslexia, which earns him cruel criticism from his father. He dreams of becoming a botanical explorer and actively opposes those who wish to exploit rare plants for money.

Acorn is the youngest member of Daisy's friend group. Despite being too young to take formal magic classes, she is brave and eager to participate in the older children's investigations. She worries deeply when her father leaves for a dangerous trip to the Amazon.

Sheldrake is the gruff deputy commander of Mallowmarsh. He openly expresses suspicion toward Daisy, labeling her an unlawful immigrant and a potential spy. He harbors bitter resentment over losing the leadership position of Mallowmarsh to Artemis.

Mrs. Daggler is the cruel head of Wykhurst Boarding School. She subjects Daisy to emotional abuse and racist remarks, creating an unbearable living situation. She secretly operates alongside those plotting against the Greenwild.

Brightly serves as the librarian for the Mallowmarsh Seed Bank and teaches at the local school. She advises her students on the emotional components of green magic and closely guards the community's rare seeds.

A historical Botanist who committed severe crimes in the Greenwild decades ago. He murdered several people to steal a ghost orchid and was subsequently banished from the community as punishment.

Ivy is a privileged student from one of Mallowmarsh's oldest families. She bullies Daisy over her Grayside origins and frequently argues with Eggbertina. Her harsh behavior stems from the intense academic pressure placed upon her by her demanding father.

Miss Tufton is an elderly, knowledgeable resident of Mallowmarsh who helps Artemis manage community affairs. She recognizes the significance of Leila's daisy necklace and quickly identifies Daisy as a Botanist.

A stray black-and-white kitten who sneaks into Daisy's luggage and refuses to leave her side. He provides crucial emotional support during her miserable stay at the boarding school and bravely follows her into the Greenwild.

A guard who wears a uniform that looks part-gardener and part-soldier. He detains Daisy upon her arrival, strictly following Mallowmarsh security protocols to ensure she is not a threat.

Eggbertina's strict and elitist aunt. She expects her niece to uphold their family's prestigious legacy by securing admission to Bloomquist and associating only with children from high-status families.

A famous botanical researcher and teacher at Mallowmarsh. He has an artificial arm made of enchanted wood and uses his extensive experience in the Amazon to teach students how to magically weave vines.

Daisy's late father, who died in a car crash when she was three years old. He originally owned the dandelion paperweight that Leila gives to Daisy, leaving behind a legacy that connects Daisy to the magical world.

An unnamed henchman who works alongside Mr. Craven. He helps track Daisy through London, attempting to capture her before she can escape into the Greenwild.