Yellow leaves red stems week 3 flower

Hey everyone. Newb here. This is my first indoor grow and everything has been going somewhat smoothly so far. I’m about 19 days into 12/12 and I’ve got a yellowing leaf problem around the bottom of one of my plants.

I’m growing in miracle grow potting soil (vegetable grower first time error), in 5 gallon fabric pots under a 900w led light. I’m feeding them bloom nutes with and to be just noticed the problem getting worse the past few days.

I’ve got some pics and hope I can answer any other questions to help diagnose. I don’t currently have a ph test yet, but am heading to the hydroponic store as we speak here.

Have been watering with distilled water and nutes every second watering.

I forgot to add. Overall she is looking a lighter green than her sister of the same strain. She is the tallest of the 2 and has grown very well.

Heatstroke said:

View attachment 4363990 View attachment 4363991 View attachment 4363994 Hey everyone. Newb here. This is my first indoor grow and everything has been going somewhat smoothly so far. I’m about 19 days into 12/12 and I’ve got a yellowing leaf problem around the bottom of one of my plants.

I’m growing in miracle grow potting soil (vegetable grower first time error), in 5 gallon fabric pots under a 900w led light. I’m feeding them bloom nutes with and to be just noticed the problem getting worse the past few days.

I’ve got some pics and hope I can answer any other questions to help diagnose. I don’t currently have a ph test yet, but am heading to the hydroponic store as we speak here.

Have been watering with distilled water and nutes every second watering.

Click to expand...

When did you switch from veg feeds to bloom? It’s hard to see anything with blurple or HPS lights on.

The pictures aren't the best - but it looks like a magnesium deficiency. With you using distilled water, those micro-nutrients are not present. They are there in well, tap or spring water but not in distilled or R/O water.

LED's can cause calcium and magnesium deficiencies. Calcium/magnesium supplements like Botincare's Cal-Mag or General Hydroponics Cali-Magic can help. Start with 1 tsp/gallon.

Cal/Mag and CaliMagic are a bit pricier - so if you want to go more on the cheap (and since you are in flower mode), you can also dissolve 1 tbsp Epsom Salt and 1 tbsp black strap molasses to one gallon. You can give this on your "just water" days. They will add important micro-nutes such as calcium, magnesium, iron, potassium and sulphur. All are needed but stripped away when using distilled or R/O water.

I grabbed a good sized bag of plain Epsom Salt and a large tub of black strap at my local Bulk Barn for less than $5.00.

Hey guys thanks for the replies. Hotrod, I switched to bloom nutes at the start of week 2 of 12/12. I was at my veg height limit for my tent and read that giving bloom nutes might help Keep it from stretching too much.
Starecase, I was thinking that was a possibility by looking at pics of other magnesium issues and I have the Epsom salts on hand. Will be making a trip to bulk barn tomorrow and give that a go for my next feed.

I will report back as I see changes.

If you could post up a few pics with white light it will help.

Ok so I had a busy weekend but grabbed some Cali-magic from good ole Amazon, and fed the girls last night. The was more yellowing before I fed than was previously there and now today I have taken note of all the affected leaves. It looks to be making its way up the plant but I won’t know if it’s slowing down till tomorrow morning or evening.

I tried to get some better pics.

Looks like mag def but acts like nitrogen (climbing from the bottom). Strange...

I checked this morning before lights off and it didn’t seem to be worse. Both plants were the same hue of green for quite a while and this is the bigger one. Same strain and have been fed identically, although I did defoliate the affected plant more than the other before flowering. (science experiment)

I added veg nutes the day I noticed the problem thinking they needed more nitrogen. Should I add some veg nutes to the bloom nutes??

Could it have a greater appetite for nitrogen than the other smaller plant? As well as the magnesium deficiency from the distilled water?