yellowing leaves

Can you anybody help me out with why my plants leaves are turning yellow and falling off? I am first time grower and any help would be very helpful.
Pics attached

also some of the leaves are brown at the tips. I am so lost and would greatly appreciate some help from some of you experienced growers.

THanks

the brown tips looks like nutrient burn, u giving them a lot of nutes or any at all? if not might be nutrient deficiency

I do give them miracle grow

could it be i am watering them too much

that looks to be nutrient burn. you need to flush the effected plants w/ water and wash out all the nutrients so the roots can recover and do it quick. your overfeeding them w/ your nutrients. what kind of miracle grow are you using? you need to use different nutes for the growing and flowering stages and make sure to follow the instructions to the letter.

just regular old miracle grow. so there is no way i am over watering? I will flush the soil asap

yea if your using miracle grow its definitely burn

Could be a combination of both: over nutes and watering. Not sure whats in Miracle Grow, but my guess is alot of nitrogen. Did your plant look fine before going to into the flowering stage? If so, that miracle grow has too much nitrogen. Nitrogen is need most during the veg state, then in the flowering stage its needs more potassium and phosphate. I suggest flushing first and stop w/ the nutes. Wait for the top three inches of soil to be dry then start watering again. Then ditch the Miracle Grow and get a fert thats for the flowering stage: anything w/ bloom in it should work well. Start slow, maybe 50% of what the directions state, and work your way up to the recommended level. Also, you only need to water once or twice a week, and only water when the the top of soil is dry and dusty. Hope this helps.