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Moving into a house with a garden last year, I collected black-pepper-like seeds from a dried out small shrub.

Putting two of them in a seeding pot resulted in having 2 small shrubs with relatively big green leaves and white trumpet flowers. The flowers remind me of various morning glory-kinds I have seen, but none of those had this kind of leaves.

The dimensions are 40-50cm large and 30-40cm high.

Click the image to enlarge

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what do the flower buds look like? Bell shaped? –  kevinsky Jul 5 '12 at 19:21
    
As I wrote in my description, trumpet. –  Patrick B. Jul 5 '12 at 20:11
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It looks a lot like Mirabilis jalapa (four o'clock flower). Almost everything fits: leaves, plant size, plant form, flower bud shape, and odd black-pepper-like fruit. But the flower form is wrong. Four o'clocks have petunia like flowers: pointed petals which are often crinkled and notched. The nearly circular outline is not like a four o'clock. –  Eric Nitardy Jul 6 '12 at 2:59
    
@EricNitardy you're right, it is Mirabilis jalapa, please make an answer. I uploaded a wrong image of the flower and haven't a right one with me now. Sorry. –  Patrick B. Jul 6 '12 at 7:15
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Maybe a species of Datura: en.wikipedia.org/wiki/Datura –  Korinna Jul 6 '12 at 7:49
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2 Answers 2

The good thing is you can dig up the roots in autumn and keep them over winter- they look like large black carrots, dry them out and keep safe from frost- plant out in late spring and enjoy or you can collect the seeds every year but be aware that they do cross quite a bit and you won't have the same colours every year. Treat them like dahlia's and they will last years and years- just don't let the frost any where near them- end game if you do...

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Well, now winter is over and I left the roots outside. Soon I will see whether their are dead or not. –  Patrick B. Mar 10 '13 at 22:14
    
@PatrickB. so are they dead? –  ashes999 Aug 6 '13 at 4:34
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This is Four o' clock flower, Mirabilis jalapa. It is native to tropical South America, and perennializes in frost free areas, grown as an ornamental annual elsewhere. The large, dark, round seeds fit your description "black-pepper-like". See pictures below:

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