Hi people. I think i sussed it out.

A couple of weeks ago I had a problem with my plant in the flower room where the leaves were yellowing. It was an N def but I mis-diagnosed it at first with an Mg def. I couldn't get access to the web to ask advice so thinking it was Mg I made a foliar spray with some epsom salts and a bit of bloom fert.

I hate waste and as I had a bit of this (probably poisonous concentration) of spray, I gave all my plants a spray. I despair at my own stupidity sometimes.

The spray did nothing to the flowering plant. I asked on here and found out it was a N def. I applied a mild veg fert and the plant re-gained health. The leaves I sprayed earlier with the mg/bloom crap dropped off and I forgot i'd ever sprayed all my plants with it.

I was scratching my head over this prob because it looked so much like a soil ph issue but my ph was not that bad... 6.3 at the very least. I scoured the Marijuana Horticulture Medical Growers Bible by Jorge cervantes and found some clues.

<quote>

"Foliar spray concentration is cumulative. nutrients delivered via the foliage can cause a buildup of salts in and around the leaves. This is similar to the way the salts accumulate in the soil"


Do you think this is a possible cause for all this damage??

I sprayed all my plants (apart from the one in flower) with plain water today to try and rid them of any residual crap. Is this sufficient?