It looks like a Jalapa mirabilis to me, Vanman, but I haven't seen a white one before. They're not hardy plants, but you're lucky to have it if I'm right.

I thought that it might be a Tobacco plant, a Nicotina?

The form of the plant is too bushy for that, I think, Bulba.

My vote's on Mirabilis jalapa.

thanks everyone i am pretty sure now it is a mirabilis jalapa

:-)) I like these - I really should grow some!

I used to - lovely colours but it's not hardy :-(

I know....there's a cottage up the lane and they grow them in the front garden every year. They do look good! That's when I first saw them, and found out what they were.

At the end of the year, carfully dig the root up and store it like a dahlia, then replant in the spring. These are great plants for bees that work late.

I've heard it called the 'Four o'clock plant'...I gather that its blooms open in the evening, do they?

As soon as the shadows of the house hit mine, they start to open, and soon the bees and the moths start fighting for food. Although Vanman has it in a pot, which can be taken in to a warmer place for the winter, the tuberous roots can become very large - well over 2 ft long. It will also self-seed very, very well, so watch for little ones getting out of control.