Britney Spears is addicted to gardening.

The 'Circus' singer - who has battled drug and mental health problems in recent years - is reportedly devoted to a new self-help programme called flower therapy, which uses plant essences to "balance physical and emotional disturbances".

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A source said: "Britney has tried every kind of therapy going. She's studied yoga, seen numerous counsellors and even experimented with mysticism, but they've never been more than passing fads.

"This time seems different though. She's committed to learning as much as she can about horticulture and how it impacts your wellbeing.

"Whenever she returns to her California home she's straight out in the garden working. She's very proud and knowledgeable about what she's planted and what is growing around her house."

The 27-year-old's enthusiasm for horticulture hasn't even been dampened by her gruelling tour schedule.

Britney has been spotted reading books about the spiritual aspects of gardening, including Jack Canfield's 'Chicken Soup For The Gardener's Soul', backstage.

The source said: "That book has given her a lot of solace."