United Kingdom 
do I have to left the bulbs out of the ground in winter
On plant
Mirabilis
15 Nov, 2009
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The top growth may be cut back by frost but the tuber may survive the mild winters outdoors - a good mulch would help? But I would suggest that tubers are lifted and stored over winter in a cool frost free place in the same way that you would store dahlia tubers.
15 Nov, 2009