I have had mixed results trying to grow seeds from supermarket chillies. The best ones I tried were Tesco finest sweet pointed peppers, they grew amazingly well and gave a decent crop of peppers, although not quite as big as the supermarket ones, but some I tried didn't grow at all. Worth a try though and its free if you buy the chillies anyway.
	
		
			
		
		
	
				
			
	
 
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