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Picture 1,2 & 3: Potassium Deficiency.

Potassium (K) Mobile Element and Macro Element

Potassium plays a big role in photosynthesis. Having good amounts of potassium in your plants helps in having sturdy and thick stems, disease-resistance and water respiration. 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 flowers. Potassium activates the manufacture and movement of sugars and starches, as well as growth by cell division. Potassium increases chlorophyll in foliage and helps regulate stomata openings so plants make better use of light and air. Potassium encourages a stronger root growth, water uptake and triggers enzymes that fight disease. Necrotic spots form on lower leaves, with red stems. The leaves appear pale or yellow.

Deficiency Symptoms
Having to little of Potassium in your plants causes the plants leaves to show retarded growth, scorched tips and edges around the leaves. Necrotic spots form on lower leaves, with red stems. The leaves appear pale or yellow. Plants may stretch and your branches can be easily broken or weak. Don’t get this deficiency confused with iron (they act very similar). 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.

Toxicity Symptoms
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. 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, and can lead to calcium deficiency. Your fan leaves will show 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.

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.

To fix Potassium deficiency
Some other supplements of potassium are: Wood ashes which are fast absorption, Kelp Meal which is medium absorption, Granite Dust which is slow absorption. Sulfate of Potash, Sulfate of Potash Magnesia, Muriate of Potash, which are medium absorption. FoxFarm Grow Big and 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. (See bottom for more)
Note: Wood Ashes can make your pH go up a bit, so please monitor your pH when using it.

To fix Potassium toxicity
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.

Click to find
on Amazon!
(Hi to Low in Potassium)
Earth Juice Bloom Master (0-50-30)-

  • Water-soluble plant food
  • Contains marine-bird fossilized guano and bone meal
  • Designed to increase production of blooms and essential oils
  • Use carefull, a little goes a long way
  • Indoor or outdoor plants
Grotek Monster Bloom (0-50-30)- is a special blend of fertilizers designed to build huge blooms and large, luscious fruits. It increases the essential oil content in herbs and speeds up the development of flower bud set and the total flowering phase. Monster Bloom adds size and mass to the flowers in the budding and flowering cycles. Stop using during the last two weeks of the flowering cycle.
FoxFarm Beastie Bloomz (0-50-30) is designed for gardeners that are ready to take their plants to the next level. This is a high-phosphorus soluble fertilizer that is geared towards building awesome buds and enormous blossoms. Beastie Bloomzs micronutrient pack goes to work creating fat, dense, tightly-packed buds, and plenty of them. Beastie will produce some over-the-top, enormous blooms that are long lasting, as well as exceptionally brilliant color. Designed to work with Fox Farms other plant foods & fertilizers.
Humboldt Nutrients DeuceDeuce (0-0-22)- is derived from sulfate of Potash, Pro-biotic Potassium, and Ascophyllum Nodosum. potassium aids plants in enzymatic function, protein and cellulose formation, efficient photosynthesis, and rapid transportation of carbohydrates and starches throughout a plants vascular system. Providing High levels of potassium to your plants will also harden flowers and improve resistance to disease and insects. The Probiotic Potassium contained in DeuceDeuce is a revolutionary method of creating efficient and instant availability of the elements within the formula. Microorganisms are suspended in dormancy and become highly active when DeuceDeuce is diluted and mixed in water. The biological life immediately begins breaking down the potassium and over 60 different elements provided by the high quality, cold pressed Ascophyllum Nodosum Seaweed. Using DeuceDeuce in conjunction with Grow Natural and Bloom Natural, will allow your plants to reach their highest level of performance. Our customers currently using DeuceDeuce have reported reduced pest infestations, increased root growth, lush vegetation, larger and harder flowers, and improved overall health of their plants.
Earth Juice Meta-k (0-0-10)- The Earth Juice line of liquid organic fertilizers are derived from an array of 100% natural, organic ingredients and formulated for vegetables, ornamentals, shrubs, trees and lawns. Used by professionals and hobbyists worldwide. Non- burning formulas stimulate vigorous growth, and provide abundant yields, while improving the soil. They are highly concentrated, easy to use, dust free, and contain no salt-building chemicals or hidden NPK boosting synthetics. Designed for soil and soil-less medias and for indoor or outdoor use, these trusted liquid concentrates fulfill the concerned gardener’s need for a convenient alternative that will provide brilliant gardens of thriving plants, naturally. All the Earth Juice products may be used solely or together for custom formulas.
Grotek Bloom Fuel (0-0-2)- Bloom Fuel represents an entirely new method of feeding aimed at pushing plants into the flowering stage. This exciting new 100% organic transition product is designed to cut down on the vegetative stage of growth and “switch” the plants over to the flowering stage. As the plant switches stages, Bloom Fuel can help create multiple flower sites with more lateral branching by providing just the right balance of energy nutrients. Begin adding 7-10 days prior to the flowering stage to encourage a flowering response. Continue to use throughout flowering. Stop using 1-2 weeks before harvest. Must be used in conjunction with your regular feeding program (preferably a flower feeding nutrient).

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