The Grow Awards 2025 🏆

Chat

By continuing to use the website or clicking Accept you consent to our cookies and personal data policy and confirm that you are at least 18 year old. For details please see Privacy Policy and Terms

Accept

Recommended

Back to Grow Questions

Magnesium deficiency?

Eagersstarted grow question 5 years ago

Can somebody help me identify this issue please? Is it a magnesium deficiency? I believe I had a mag def a week back and since have fed 0.8EC of calmag before i add nutrients. Growth is healthy but yellowing slowly creeps in to newer leaves and curl. Runoff ec/ph seem fine.

Eagers

Eagers

Eagers

Solved

Leaves. Veins - yellow between

likes

GMSgrowsanswered grow question 5 years ago

Hey Eagers, dont be to eager to add anything until you know what is going on. Check your runoff ph and ec levels to see where you at with a tester. If your in soil only add the cal/mg once every 2 weeks or you will overdose them. Hope this helps. Cheers friend

1 like

Complain

Selected By The Grower

The8thChevronanswered grow question 5 years ago

Could be a mag issue. Could also be heat stress. Seems like you've identified and fixed the most likely cause, if it doesn't get worse, you're fine. Good luck mate!

1 like

Complain

Similar Grow Questions

Solved

Deficiency and assimetric development My girls seem to have a deficiency, strangely enough, the gal with the most signs of deficiency is doing the best in bud production. Any ideas on what is going on here and what is the cause of the deficiency? There is also some purple on the stem

Buds. Not fattening

Leaves. Veins - yellow between

Plant. Stem - Red or purple

2 years ago

5

9

Solved

Having problems in flower This is my 1st grow ever and i have a skunk #1 auto is in flower and it started getting browning on the sugar leafs and now its progressed to yellowing of the sugar leafs and I'm not sure why any help is appreciated?

Leaves. Veins - yellow between

2 years ago

4

5

Solved

What to do? Where am I at now actually? I’m lost and slightly discouraged When should I add happy frog fruit and bloom? This is my 3rd grow and im 0-2! I have a overfeeding problem but I’ve learned to be corrective and precise with ph and ppm and be pest preventative as well (heavy handed waterer as well..im trying). It’s day 5 of flower and I’m lost

Leaves. Veins - yellow between

Other. General questions

Feeding. Other

2 years ago

4

5

Solved

Aussiegreenthumb82

Yellow centre veins fan leaves Yellowing of the inner vein of fan leaves only. Also sporadic yellowing and blemishes of whole fan leaves but only some, others fine nice and green. All bud leaves and buds don't appear affected. Is it just that she's nearing the end of her life cycle? Or over water/over nute?

Leaves. Veins - yellow between

Leaves. Color - Yellow

2 years ago

2

3

Solved

yellow leaf, brown spots deficiency Can you guys help me identify this deficiency??

Leaves. Veins - yellow between

Leaves. Color - Yellow

Leaves. Color - Pale

2 years ago

3

4

Solved

Yellowing For some time now their has bin two small areas about the size of your fist that had yellow spots so I tryed giving it Cal-Mag extra in with its feedings but now all of a sudden the hole plant looks like some one splattered it with yellow

Leaves. Veins - yellow between

Leaves. Color - Yellow

2 years ago

5

Solved

Does anyone one know the deficiency causing the leaves to yellow in this fashion?

Leaves. Curl down

Leaves. Veins - yellow between

Leaves. Color - Yellow

3 years ago

1

1

Solved

Leaf issue deficiency or toxicity Hello everyone, having a slight problem diagnosing this problem. My 1st grow in coco/perlite. Ph is 5.8-6.1 of feed @ 1.1 ec Is this nutrient lockout? I’m thinking manganese or potassium problem…………really don’t know.

Leaves. Edges burnt

Leaves. Tips - Burnt

Leaves. Veins - yellow between

3 years ago

4

4

Solved

White/Yellow snipes on leaves? (13th day of growth from seed)I noticed a huge change in my plant leaves in less than 24 hours. The leaves look like they are getting burned out. What is happening? I'm uploading pictures to see the problem and also the growth conditions. I'm watering once every 1 or 2 days (PH = 6.0). Not using nutrients yet

Leaves. Veins - yellow between

Leaves. Color - Pale

Leaves. Color - Mottling

3 years ago

3

3

Solved

Missing nutrients high ph I put my moisture/light/pH thing in the soil and it is high in alkaline. We have a lot of Alkaline in our water here. Soil is made out on my growers farm. She has grown for 30yrs now. Never had these problems till this year. What can I use to compensate and bring the ph down?

Leaves. Veins - yellow between

Plant. Stem - Red or purple

2 years ago

3

2

Solved

Veins turning light green on lower leaves One of my plants is getting light green veins on the lower leaves. Is this magnesium deficiency? I can't water currently without risking overwatering, can I just foliar spray BioBizz cal mag to temporarily help recovery? Or is this something else entirely?

Leaves. Veins - yellow between

3 years ago

6

8

Solved

Still to early to tell? Noticed yesterday and have slightly worsened today. Not sure the issue but potentially magnesium? Getting close to top dress also.Only on 1 of 3 plants so far. On older growth after getting dose of Recharge the other day. Maybe an N problem as I also use 484? Or mag? Using CalMag every other watering in RO at 150ppm as the soil has some cal and mag. Also getting close to top dress time maybe something else?

Leaves. Veins - yellow between

Leaves. Color - Yellow

Leaves. Other

3 years ago

4

Solved

3 week old Skittles plant This is one of my skittles plants I'm growing right now. One of the leaves on her started getting lighter spots near the veins. It is only a little right now but I am wondering if there could be an issue that I could solve before it gets worse.

Leaves. Curl down

Leaves. Veins - yellow between

3 years ago

2

5

Solved

What could this be Can somebody tell me what happend with my leaves

Leaves. Veins - yellow between

2 years ago

1

1

Solved

Magnesium problem? Please confirm Do i have a magnesium problem? Excess or deficiency ? Some of the fan leaves have what i describe as faint, lightly coloured tiger stripes coming through. 4th picture in my week 3 diary for reference. Should i flush?

Leaves. Veins - yellow between

2 years ago

2

2

Solved

Leaves curling on sides Okay so the leaves are acting weird and kinda curling in on the sides. Like it's heat issue. I think maybe to strong LEDs. Idk. It's only 79°f Light (ESv300) is on lowest setting @32in away. Fed GH flora trio. Only 237ppm. The leaves are also yellowing between veins.

Leaves. Curl up

Leaves. Veins - yellow between

2 years ago

3

4

Solved

a_tribe_thats_stoned

Leaves discolored Hey guys I’ve been working like crazy but got home last night to my leaves looking like the pic I put on here. They are dirt auto flowers that are a week into flowering. Thank you

Leaves. Veins - yellow between

2 years ago

1

3

Solved

Yellow dots near veins of leafs - Week 4 autoflower gsc in space bin Noticed these yellow dots two days ago. It is now 1 day until it has been 4 weeks of veg. Two days ago I have it it’s first does of nutrients, Miracle-Gro 20-20-20 plant food. Just gave it another shot today. Is there anything else I should do to keep the plant healthy? Thanks

Leaves. Veins - yellow between

Leaves. Color - Yellow

2 years ago

1

4

Solved

YELLOW LINES ON FIRST SET OF TRUE LEAVES Hello fellow growmies. I am feeling very anxious about this particular seedling which has weird yellow lines and wrinkling leaves since 3-4 days, from well before i put myco and they're growing also but not this issue doesn't seem to fade away please help URGENT!!

Leaves. Veins - yellow between

2 years ago

5

3

Solved

Light cloudy green areas between veins Hi, Two of my plants (3rd week of veg) have these symptoms on the middle level fan leaves (the biggest ones). Young growth looks ok. Doesn't look like anything in symptoms photos, closest thing is magnesium deficiency. What do You think it could be?

Leaves. Veins - yellow between

2 years ago

18

8