How cold is to cold ?

[1Islandguy]

Basicly i started my plants to early the goal was to put them outdoors the end of May there under basic t8 shop lights and im thinking the lights are starting to show there limitations its bright and sunny outside but cool 48 f is it to cold to put them outside id stil nring them in at nite

 

[mysticepipedon]

They won't grow at 48 F. It won't kill them, but growth essentially stops at 50 F.

The rule of thumb for biological activity is for every 10 F increase, activity doubles.

 

[LexLuthor]

A greenhouse will help with the cold weather. They got them on Amazon for a decent price, or build your own.