Yellowing edges on leaves (seemingly old growth), small white spots on lower leaves

Started with three plants, one died within two days. Other two look good but with above mentioned afflictions. Pretty much first time growing and am kinda nervous.

White spots are often signs of spider mites look underneath the leaves, maybe a magnifying glass with help ?
-good luck

Thanks for the info, we did look under the leaves and saw no sign of bugs, but didn’t have a magnifying glass or any other visual aid. Need to invest in one of those. Would that cause the discoloration of the leaves as well? Can spider mites cause rapid decline of a plant also?

Strain; Ak47, purchased from this great site.

Soil in pots, Hydroponic, or Coco? In the ground.

System type? N/a

PH of runoff or solution in reservoir? N/a.

What is strength of nutrient mix? Started with kelp meal; 1-0-2, switched to blooming fertilizer; 6-10-10.

Indoor or Outdoor; outdoor

Light system, size?- sun.

Temps; 75-85/ 55-65

Humidity; N/a

Ventilation system; Yes, Wind.

Co2; Air

Here foxes, this is another Thread about spider mites with pictures …hope it helps ?
-good luck


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OK are wiithout pic’s I’m pretty sure its potassium
Dose this pic look like your problem ?

Potassium plays a big role as well. Having good amounts of potassium in your plants helps in having sturdy and thick stems, disease-resistance, water respiration, as well aids in photosynthesis. Potassium is also found in the whole plant. It is necessary for all activities having to do with water transportation. Potassium is necessary for all stages of growth, especially important in the development of Buds.

Having to little of Potassium in your plants causes the plants leaves to show retarded growth and show a scorched tip and edges around the leaves. Plants may stretch and your branches can be easily broken or weak. Don’t get this deficiency confused with iron, because it almost acts like iron but to tell the difference in the two is: for potassium the tips of the leaves curl and the edges burn and die. Older leaves may show a red color and leaves could curl upwards. Dead patches (Necrosis) can happen on the margins of larger fan leaves thus, the leaves will eventually die off and turn brown. The Older leaves will show different patches of color (mottle) and turn yellow between the veins, following by whole leaves that turn dark yellow and die. The plants overall growth slows down, mostly when they are in vegetative stage. To little amount of potassium also slows the growth of buds during flowering stages. Dark edges will appear around the edges of the leaf when the deficiency is starting to happen. When your Relative humidity is low, you can almost bet your going to soon get a potassium deficiency from your plants perspiration.
Potassium can get poorly absorbed when having too much Calcium or ammonium nitrogen, and maybe cold weather. Having to much sodium (Na) causes potassium to be displaced. SO keep those in mind… Parts affected by a Potassium Deficiency are: older leaves and leaf margins.

When you have too much Potassium in your soil, it can lead to big troubles, like salt damage and acid fixation of the root system, as well as too much potassium can cause a calcium deficiency. Your fan leaves will show like a light to a dark yellow to whitish color in between the veins. Due to a molecular imbalance, potassium toxicity can cause a reduced uptake and lead to the deficiencies of Mg, and in some cases, Ca. Also leads to the other nutrients to not be absorbed properly leading to lots of other deficiency such as: magnesium, manganese, zinc and iron and can cause problems with calcium as well.

Problems with Potassium being locked out by PH troubles
Soils with excessive Leeching and High ph soils and or water.Soils that are potassium fixated. An excess of kitchen salts (sodium) in the root system/enviroment.


Potassium gets locked out of soil growing at ph levels of 4.0-5.5
Potassium is absorbed best in soil at a ph level of 6.0-9.5. (Wouldn’t recommend having a ph of over 7.0 in soil) anything out of the ranges listed will contribute to a Potassium deficiency.

Hydro and Soil less Mediums

Potassium gets locked out of Hydro and Soil less Mediums at ph levels of 4.0-4.5, 6.0-6.5.
Potassium is absorbed best in Hydro and Soil less Mediums at ph levels of 4.7-5.3, 6.7-8.5. (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a potassium deficiency.

Solution to fixing a Potassium deficiency
Any Chemical/Organic nutrients that have potassium in them will fix a potassium deficiency. Again Peters All Purpose plant food 20-20-20, will cure the potassium deficiency , Miracle grow Tomato plant food, Miracle grow All purpose plant food.( Only mixing at ½ strength when using chemical nutrients, or it will cause nutrient burn!) Some other supplements of potassium are: Wood ashes, which are fast absorption, Kelp Meal, which is medium absorption, Greensand, which is slow absorption, granite dust, which is slow absorption. Sulfate of Potash, Sulfate of Potash Magnesia, Muriate of Potash, which are medium absorption. FOXFARM GROW BIG HYDROPONIC CONCENTRATE, which is fast absorption. (FFGB can bring your ph down as well) Earth Juice Meta-K, which is fast acting. (Can bring down your ph as well) Leaves will never recover, but the plant will show recovery after about 4 to 5 days when using a fast acting nutrient.

Note: Wood Ashes, can make your ph go up a bit, so please monitor your ph when using it.
Now if you added to much chemical nutrients and or organics, (which is hard to burn your plants when using organics) you need to flush the soil with plain water. You need to use 2 times as much water as the size of the pot, for example: If you have a 5 gallon pot and need to flush it, you need to use 10 gallons of water to rinse out the soil good enough to get rid of excessive nutrients.

Hope this helps



Thank you. I was told not to use neem once my plan5s start bloom. I have azomax , I will use it but thinking of using neem in the soil.
Do you know if neem will hurt my new buds?

Wow! Thanks for all that info. That pic does look similar to what’s going on with our babies, but not exactly. I’ll get some pics as soon as possible and get them on here as to help aid diagnosing the ailment(s) with our dear babies. Thanks again for the help and am happy to have such a great recourse at our fingertips.


Here are a few pictures of our poor babies.

It looks like you have more than one thing going on.

It looks like you also have bugs, those holes certainly look like something has been eating the leaves. It also looks like you might have snail or slug trails on your leaves.

Assuming you are feeding regularly enough, you probably are not lacking in the potassium department, however you might have something interfering with the plant’s ability to uptake the nutrient. This is most often due to pH related deficiency or toxicity. Or possibly a nutrient salt build up in the soil. Either way, as mentioned in the text pasted above, a toxicity can cause other nutrients like potassium to become locked out or unavailable.

Happy growing,


What looks like snail or slug trails is actually rain, it was raining here shortly before taking these pictures. Thanks for the information, I’m hoping to be able to pull these babies into shape before it’s too late.

Thanks again,