Advice on triggering flowering outside

[Phyto]

But if you want to introduce flowering throw a black tarp or plastic over the top of the tunnel really black it out, then you remove it for as long as you want during the sunlight hrs.

Be careful you don't cook the plant, black tarps/plastic will transfer a lot of heat when the sun is on it!

 

[Tahoekushcat]

But if you want to introduce flowering throw a black tarp or plastic over the top of the tunnel really black it out, then you remove it for as long as you want during the sunlight hrs.

throw a black tarp on a hoop house and you will heat it up . Black tends to absorb UV
Use this product Panda Tarp instead
White out to black out without heat up