HELP!! Dark Brown Tips (Not yellow)

New to all of this just need a quick fix! Plants doing well growing outside. Yesterday all green today leaves are turning Dark Brown.. From the bottom leaves all the way to the top. Some dark brown on the edges some dark brown on the tips. Now you will all probably laugh at me, but I' hoping to find a quick fix.. (Hiding everything from my wife) In otherwords I'm hoping to fix this without buying chemicals or re-potting.. Anyone know what I can do?

Check out this page and search "brown" on the page. Good luck.

Marijuana Plants Problems - Yellow Leaves, brown spots, nutrient shortage etc.

Check nigh time temps outside. If to cold at night you can fill a barrel with water and allow the day light sun to keep it warm. Place it next to the plants for night time warmth. Besides poisons. Cold weather can make changes like that.
Arno j