New York, Aug 7 - British actress Sienna Miller, who lost a role in 'The Constant Gardener', fears her green hair may have cost her the part opposite Ralph Fiennes.

The blonde actress reveals she had a home dye disaster the night before the audition for the film and she insists she could not have looked worse, reports hollywood.com.

'I've tried to dye it (hair) dark before and it went horribly wrong. I thought I'd be all organic and hippie and I used henna instead of normal hair colour, which if you have blonde hair, goes green... proper pond green. I had an audition the next day for 'The Constant Gardener', which I didn't get,' she said.

Rachel Weisz eventually landed the role Miller auditioned for and won an Oscar.