Remember some landscapers use plastic to solar kill grass. I wouldn't use plastic because it doesn't breathe and can hurt the plant. Instead, use a large box or a large trash can to cover the plant to force flowers.
If you put plastic over a plant you can run into problems. I did that once only to find my plant got burned really bad.
The best cover for light deprivation is a large paper box.
Solarization is the process of placing a clear plastic tarp over a field, garden bed or lawn to heat up the soil underneath. The intention of solarization is to kill weeds or grass, though it can have added benefit of reducing pathogen populations in the soil. Google
Solarization, etc...
Your buds are about a week ahead of mine. If you care to see,
One lonely clone
I was not even going to grow any plants this year for a couple of reasons, but a friend had a couple too many and gave me one of his clones. I don't even know the strain yet, as he forgot, but will find out from the person he got them from. I'll edit this firsdt post when I find out. Anyway...www.icmag.com
Based on you only used light deprivation for a week, and the strain info here,
Flowering period 56-63 day, finish late September.Banana Candy Weed Strain Information | Weedmaps
Find out everything you want to know about the marijuana strain Banana Candy. Learn about its origins, where to find it, and more.weedmaps.com
I suggest (not arguing) it was starting to flower on it's own anyway.
I surely hope you do not loose it to thieves.