Sometimes you’ll get something that looks a lot like tip burn with a potassium deficiency, but it goes in further than nutrient burn, and with a potassium deficiency you also see yellowing between the leaf margins
Keeping your grow lights too close, for example with powerful LEDs and HPS grow lights can give your plants “sunburn” even if the temperature is cool! This can sometimes look like exactly like a cannabis potassium deficiency when the true problem is your grow lights are too close to your leaves.
You may see the brown burnt edges first, or you may see the yellowing first. When the leaf symptoms are both present, it’s a good sign you have a potassium deficiency in your leaves.
Example of a marijuana potassium deficiency with common leaf symptoms
These leaves look like they have a potassium deficiency but the symptoms are actually caused by light burn (grow lights being kept too close)
If you cannot get rid of your potassium deficiency and want to look at more pictures of cannabis leaf symptoms…
Most cannabis growers don’t need to add more nutrients if their leaves are experiencing a nutrient deficiency. In fact, most growers have actually already given plenty of potassium to their cannabis plants, whether they meant to or not. If you’re using quality soil or cannabis-friendly nutrients, you probably don’t need to worry about adding more patassium.
In soil, potassium is best absorbed by the roots in the 6.0 – 7.0 pH range
Sometimes the first symptoms of a cannabis potassium deficiency look a lot like nutrient burn. One difference is the edges of the leaves will also start turning brown, where nutrient burn usually only affects the tips. And unlike with nutrient burn the leaves of a potassium deficiency turn yellow in the margins, especially near the burn edges.
Leaves with a potassium deficiency have yellow, brown, or burnt edges and tips. It may look like nutrient burn, but the leaf margins also turn yellow.
The buds of this plant won’t have superior smell or flavor since potassium is essential in terpene production.
In the picture #2 we can see how the plant has suffered a more serious potassium deficiency.
This element arrives at the oceans and seas through rain, aquifers, rivers, etc, where it returns by evaporation to the sky in the form of water vapour. This vapour condensates and returns to Mother Earth in form of rainfall. .
Advanced stage of Potassium deficiency
Early stage of potassium deficiency
Intermediate stage of potassium deficiency
Symptoms of potassium excess:
These deficiencies are usually more evident and frequent in Indica strains, which are often grown without much knowledge since their flowering stage is much faster than Sativas, and the maximum demand for potassium is centralized in no more than 1-2 weeks, depending on the strain.
In this post we show you how to detect a deficiency or excess of potassium in cannabis plants, so you can have a crop without problems and harvest the