Autoflower greenhouse grow

Haggis1981

Member
I have 3 banana blaze autos growing and they are week 3/4 flowering stage . Some of the pistons have turned brown overnight. Is this normal. And also weather is getting colder and cloudy for the foreseeable future. Will this kill my grow or should I be able to get a harvest even if it’s small?
I have added a few photos if they any good .
This is also my very first time growing .
 

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