Did my plants have a mag deficiency? Why are they dropping now?

The303Yeti said:

I agree. I usually try to feel for moisture in the loose top layer and drainage holes but knowing your plants will always yield better results.

Also on the drought topic. Cannabis produces trichomes as a way to reflect light away from itself keeping its buds cooler. Trichomes are the only part of the plant that produces THC.

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I would also suggest anyone that is new and having trouble figuring out a good watering routine get a moisture meter. An analog one is less than $10 on amazon. I got my wife one because she tends to over water the house plants. She used it for about a month or two and doesn't need it anymore.

If it is a deep pot and the probe doesn't reach deep enough, drill a small hole in the side of the pot towards the bottom. That way a person can be sure.

This is the one I bought.

http://www.amazon.com/gp/aw/d/B00PTLGKSQ/ref=mp_s_a_1_2?qid=1459972070&sr=8-2&pi=SY200_QL40&keywords=moisture+meter&dpPl=1&dpID=51uKF0xeH8L&ref=plSrch

why are you using calmag with dyna gro and protekt? you don't need it with those.