There are 3 books in the Poison Diaries series. The newest book is Weed which came out in 2013.

1
The Poison Diaries

By Maryrose Wood , The Duchess of Northumberland ,

Book cover of The Poison Diaries

A dark, gothic tale of romance... and murder.

In the right dose, everything is a poison.

Jessamine has spent her whole life in a cottage close to her father's apothecary garden, surrounded by medicinal plants and herbs that could kill her - although her father has never allowed her into…

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2
Nightshade

By Maryrose Wood , The Duchess of Northumberland ,

Book cover of Nightshade

Sixteen-year-old Jessamine Luxton is heartbroken. Her true love, Weed, the strange but intriguing young man who came into her life so suddenly, has disappeared. How could he have left her with no farewell, and no word since?

Jessamine may not know why Weed vanished, but she does suspect that her…

3
Weed

Book cover of Weed
Am I of the growing world, bound to the everlasting root, or am I simply a red-blooded man, destined to die? -Weed

The seductive central character from the internationally acclaimed Poison Diaries, Weed, re-awakens in this book to a world where he must try to do good and learn from…