Quote Originally Posted by sccrocks
:rasta:Good Day
I am looking after 46 plants for a client and I just went through what you are going through now. And yes it looks like the start of a Cal/Mag problem. The curling of the leaves would confirm this. Do you have brown spots that look like rust are on leaves that are on side or bottom of plant with very little chance of light burn!!???? And small holes starting on leaves???
I think you're right unfortunately. I see a lot of these brown spots on leaves near the middle of the plant and it's definitely not light burn.

So, you think the leaf edges curling is related to the brown/rust spotting? Is curled leaf edges a sign of Cal/Mag problems too?

Since I'm using tap water, the only thing I can think of is the pH being off. I did get some pH runoff water that was about 5.5 and this was after watering with pH 6.5-6.8 water. So, I think my soil pH was pretty low (<5.5) and I don't know how it got that way as I always pH my water to 6.2 - 7.0 before watering. So, it must be this FFOF soil.

I gotta get this figured out as it doesn't appear to be getting better! The plants were recently transplanted into bigger pots so they are taking forever to dry out now. Should I start a flush even though the plants are still pretty moist from the last watering? Arrrghh... they're gonna take 5-6 days to dry back out after the flush!
lampost Reviewed by lampost on . Are these brown spots cal/mag deficiency? There are 1 or 2 plants showing these brownish spots on a few leaves. Some of the spots have grown into small brown patches. These plants are 5 weeks old and have been in 12/12 for 1 week. They are watered with tap water treated with vitamin C (for chloramine removal), so I doubt there's an actual calcium/magnesium deficiency in the water. It's possible the pH swung pretty low for a short period (1-2 weeks). What do you think these spots are caused by? I'm certain they aren't spider Rating: 5