Asparagus growth speed is different during the day and at night. During the day the average growth speed is 0.37 cm/hr. At night it is 0.18 cm/hr. So basically, the growth speed is doubled during the day compared with that at night. The summary: 
The sources: 1). 13.8 cm 

2). 12.0 cm 
3). 17 cm 
4). 15.5 cm 
5). 20.1 cm 
6). 17.3 cm 
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