The Grow Awards 2026 🏆

Back to Grow Questions

Help! K deficiency? Problem is spreading…

Newbie101started grow question 4y ago

Changed water 3 days ago, with more K. EC staid stable at 0.9. tank that feeds RDWC is only 0.4 and fed 60L into system by now, so EC should have been dropping in the last 3 days. pH decreased from 6.3 to 5.9. So I know something is definitely wrong. Last 2 pics, same leaf, 3days

Newbie101

Newbie101

Newbie101

Newbie101

Open

Leaves. Color - Yellow

likes

Answer

BSG420answered grow question 4y ago

What week of flower are you in? ✌️🏼

likes

Complain

Newbie101answered grow question 4y ago

So something went wrong. The 2 photos of the same leaf that are 3 days apart are the 2 middle photos

likes

Complain

Similar Grow Questions

Solved

Folhas amarelas caindo, início de floração Olá amigos preciso de ajuda, a minha planta todos os dias está a deixar cair folhas... Ficam amarelas, murcham e quase caem sozinhas, Será falta de Água ou água a mais? Tenho o pH controlado, há duas semanas faz muito calor, Mas a Planta não murcha. Parece saudável mas.não sei

Leaves. Color - Yellow

5y ago

5

4

Solved

Lower leaves looking like this on multiple plants What does this leaf tell you? a deficiency?

Leaves. Color - Yellow

4y ago

2

7

Solved

Midwest_X_Mayhem

Deficiency or Genetics Would you guys guess the yellowing on these leaves is more natural coloration from genetics or do you guys see something more? Plant is definately small but seems to be healthy and buds keep growing.

Buds. Other

Leaves. Color - Yellow

Plant. Other

4y ago

2

2

Solved

End of leaves start to be yellow Hi everybody i for a litle problem with my autos. The end of the leaves start to be yellow on 3 of them. It is realy small but... I was thinking potassium but potassium make it more brown normaly. Anyone have an Idea ?

Leaves. Color - Yellow

5y ago

3

4

Solved

Grow problem Hello everyone another week to spend small problem with this plant I have the impression that the flowering has stopped net I have the impression that the flowering has stopped net and the plant has started to turn yellow I suspect that it comes from oxygen from the roots but sur

Leaves. Color - Yellow

3y ago

3

2

Solved

What’s the problem ?Rqs Nl Auto week4 flowering BioBizz all mix biobizz nutrients What’s the problem ?

Leaves. Color - Yellow

Leaves. Color - Dark-brown

Leaves. Color - Black or grey

3y ago

2

2

Solved

Plant health got worse, flush now or wait until tomorrow?Its obvious that my plant needs Calmag Pro. Over the weekend i couldnt buy it and now my leaves look even worse. GPT recommended to flush now and then wait couple days until I add Calmag Pro. What should I do because normally tomorrow also wouldve been pour day. Im on Soil

Leaves. Tips - Die

Leaves. Color - Yellow

4mo ago

1

9

Solved

deficiency?hi folks, is this calmag deficiency or what? its week 7. i always added 0.2 ec calmag to the solution. why im getting this now? maybe i need more of it. its only in one of the plants.

Leaves. Color - Yellow

Feeding. Deficiences

4y ago

2

3

Solved

yellowing on bottom leaf but rest are fine?Why is my bottom leaf turning yellow but rest are fine?

Leaves. Color - Yellow

5y ago

1

6

Solved

Yellow leaves Hi everyone! I have some problems with this gorilla ! How can I help her ?

Leaves. Color - Yellow

5y ago

3

3

Solved

Question Anyone know what it’s deficient on?

Leaves. Color - Yellow

5y ago

1

Solved

Nutrient Burn, Leaf Septoria, Nutrient Deficiency? Or something else?I have been having issues with the Purple Haze. I've tried adjusting the Temperatures, adding additional Cal-Mag, changing lumen intensity etc. I believe this may be nutrient burn? Added an old image of leaf before mainlining, the plant is 1 week old after mainlining was done.

Leaves. Color - Yellow

Leaves. Color - Black or grey

Roots. Too few

5y ago

3

3

Solved

Hydro DWC New to hydro, first attempt. Does this look healthy? On second week of bloom transition. The lower original leafs have some yellow on them and brown dots. But otherwise any input would be greatly appreciated.

Leaves. Color - Yellow

Plant. Other

4y ago

3

Solved

Yellowing Budsights Early Fower (organic grow)I fed the plants yesterday and noticed that it was too warm in the tent. (86F) So I change the light time to 9pm-9am. As a result, the plants had 24 hours of darkness in the tent. When I turned on the light today I noticed that some of the buds had yellowed. pH (soil): 7,8-8,4

Buds. Other

Leaves. Color - Yellow

Techniques. Other

4y ago

2

2

Solved

White Widow day 42 looks like she lacks something Hi, its day 42 (feminized white widow). My first grow. She is growing in a minigrow growbox on soil. since a few days old leaves turned yellow. also on the younger leaves the edges turn yellow and have some darkish spots. ph is ~6. any ideas? what kind of lack could this be?

Leaves. Color - Yellow

6y ago

2

4

Solved

Yellowing bottom leaves lack of nitrogen?The yellow in the bottom leaves does that look like lack of nitrogen ? Soil has been very wet so haven't fed in a week or so.the top is dried today I will water and feed.

Leaves. Color - Yellow

6y ago

4

2

Solved

GREENGENERAL420

Hi all growers, can someone pls help met to identify whats happening to the leafs of this Northern light auto.. Is it a deficiency of Potassium or Magnesium or did the leafs just got light burned or what do you think 🤔

Leaves. Color - Yellow

Leaves. Other

4y ago

3

Solved

Leaf discoloration I just noticed some leaf discoloration. What could it be? Just entered 2nd week of flower using roots organic lush soil. Top dressed a week ago with terp tea grow and bloom. I use r.o. water also using urb and fish shit every now and then. Is this a deficiency?

Leaves. Color - Yellow

Leaves. Color - Pale

2y ago

1

5

Solved

Help with unhappy plant Started developing yellow/brown spots last week. Watering approx 2L every 3 days. Soil is HF/OF/perlite mix. Gave first feeding of FF Trio at 1/3 strength 2 days ago but she's continuing to look worse. More spots, lack of color and droopy leaves.

Leaves. Color - Yellow

2y ago

6

5

Solved

Send HELP!I wonder if this yellow ton and even starting the orange should be from the strain of is getting burn? What can i do? reduce sun light? should i start feeding with veg suplement?

Leaves. Color - Yellow

Leaves. Color - Dark-brown

5y ago

1

1