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Diagnose Sick Cannabis Plants | Marijuana Nutrient Problems & Symptoms by Picture
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<blockquote data-quote="L0oD" data-source="post: 418280" data-attributes="member: 42867"><p>Magnesium Deficiency</p><p></p><p></p><p>Problem: A light green or yellow coloring will begin to show on the veins and edges of the lower & older leaves - this is one of the classic signs of cannabis magnesium deficiency.</p><p></p><p>Magnesium is a mobile nutrient, which means that the plant can move it from old leaves to new leaves. If you don't react to it promptly, a cannabis magnesium defiency can spiral out of control and cause your plant to lose a lot of lower leaves quickly. The plant will pull magnesium out of older leaves and bring them to the newer leaves. That's why a magnesium deficiency usually appears towards the bottom of the plant and on older,</p><p>less important leaves.</p><p>[ATTACH=full]54230[/ATTACH] </p><p></p><p>The edges of the leaves may become yellow or bright green and may start feeling crispy to the touch. This crispiness around the edges is different from nutrient burn,which does not lighten the margins inside the leaves.Sometimes you will also get light brown spotting within the margins or along the edges if the problem continues to get worse,</p><p>though this may be partially other deficiencies, which often happen alongside a magnesium defiency.</p><p></p><p>Magnesium deficiencies are easy to prevent and fix once you know what to do. Read on below to learn how.[ATTACH=full]54235[/ATTACH] [ATTACH]54236[/ATTACH] [ATTACH]54237[/ATTACH]</p><p></p><p>Solution For Magnesium Deficiency in Cannabis</p><p></p><p>Your cannabis plant may show signs of a magnesium deficiency if the pH at the roots is too low,especially in hydro. That is because when the pH of your root zone is not in the correct range,your cannabis cannot properly absorb magnesium through the roots.</p><p></p><p>Often with this deficiency, the magnesium is present, but the roots cannot absorb the magnesium properly due to an improper pH. Therefore it is very important to maintain the correct pH</p><p>(and make sure the pH does get to low / acidic) in order to avoid a magnesium deficiency.</p><p></p><p>Growers using Coco Coir or Reverse Osmosis (RO) water usually need to supplement their plants with extra Calcium & Magnesium in addition to regular nutrients. Treating coco coir with Cal-Mag and supplying extra throughout your grow is recommended for grower in coco coir, or those using RO water.</p><p></p><p>Adding more magnesium to a system when there is a pH lock-out will probably not help because the plant will not be able to absorb any magnesium until the pH has been corrected. If there's</p><p>already enough magnesium, adding more can cause other apparent deficiencies by locking out other nutrients from the plant.</p><p></p><p>Please note: Once a magneisum deficiency is cleared up, the problem (yellowing lower leaves)</p><p></p><p>will stop spreading to other older leaves, usually within a few days. Please note that leaves</p><p></p><p>which have been damaged by a magnesium deficiency will probably not recover or turn green,</p><p></p><p>so you want to pay attention to other growth for signs of recovery.</p><p></p><p></p><p>In soil, magnesium is best absorbed by the roots in the 6.0 - 7.0 pH range(some growers say a 6.5 - 7.0 pH is best if you suspect a magnesium deficiency)</p><p></p><p>In hydro, magnesium is best absorbed by the roots in the 6.0 - 6.5 pH range(in hydro, it's generally recommended to keep the pH between 5.5 - 6.5,but magnesium specifically tends to be best absorbed above 6.0)</p><p></p><p>If you suspect your growing cannabis plant has a magnesium deficiency, flush your system with clean,pH'd water that contains a regular dose of cannabis-friendly nutrients that includes magnesium.</p><p>This will remove any nutrient salts that may be affected the uptake of magnesium and help restore pH to the proper levels..</p><p></p><p>To supplement with extra Magnesium...</p><p></p><p>Calcium, magnesium, and iron deficiencies often appear together in cannabis.Many growers decide to purchase some sort of Calcium-Magnesium (often called Cal-Mag)supplement for their grow room in case one of these common deficiencies appear.</p><p></p><p>Listed below are common cannabis Calcium supplements,along below with some general information about each one. After supplementing with Cal-Mag and correcting the pH, you should expect to see</p><p>new healthy growth within a week. Remember, the old leaves will probably not recover,but new growth should be green and healthy.</p><p></p><p>Hand-watered grow - Flush the system with properly pH'ed water that contains a full set of proper nutrients that are suitable for growing cannabis. Make sure you are using the right nutrients for</p><p>the stage your plant is in. Check the pH of your runoff water to ensure that nothing in the growing medium is throwing off the root pH.</p><p></p><p>Hydro grow - Check the pH and PPM of your reservoir water to make sure that pH is on target and nutrient levels are not lower than expected. If you do this and are still not certain what</p><p>is causing the magnesium defiency, it is recommended that you drain your reservoir and refill with a newly mixed reservoir with fresh nutrients that has been pH'ed.</p><p></p><p>Adding extra magnesium is often not necessary if you are using tap water. However, you will likely want to supplement Cal-Mag if you are using filtered or reverse osmosis (RO) water,since most tap water already contains some amount of all 3 of these cannabis nutrients.</p><p>Cal-Mag also has a small amount or iron, which is another trace cannabis nutrient that is often missing in filtered water.</p><p></p><p></p><p>How long until new growth looks better? If you fix the root of the problem, further yellowing and discoloration of the leaves should stop almost immediately. Some of the effected leaves may recover somewhat, but what's most important is to make sure the problem isn't continuing to spread to other leaves on the plant.</p><p></p><p>I generally don't remove any discolored leaves until I know for sure that the problem is completely gone and is no longer spreading to new leaves (that way any possible further discoloration will happen to the leaves that have already been affected).</p><p></p><p>Leaf Color:</p><p>Edges Appear Brown or Burnt</p><p>Pale Color Leaves</p><p>Yellow Leaves - Lower, older leaves</p><p>Yellowing Between Veins</p><p>Veins of Leaves Stay Green</p><p>Brown or Dark Spots</p><p>Mottling / Mosaic Pattern</p><p>Leaf Symptoms:</p><p>Lower Leaves / Older Growth Affected</p><p>Leaf Tips Appear Burnt</p><p>Leaf Tips Die</p><p>Yellowing Between Veins</p><p>Veins of Leaves Stay Green</p><p>Spots</p><p>Mottling / Mosaic</p><p>Old Leaves Dropping Off</p><p>Twisted Growth</p><p>Leaves Curl Under</p><p>Leaves Curl Upwards</p><p>Wilting / Drooping</p><p>Plant Symptoms:</p><p>Old Leaves Dropping Off</p><p>Twisted Growth</p><p>Leaves Curl Under</p><p>Leaves Curl Upwards</p><p>Plant Wilting / Drooping</p></blockquote><p></p>
[QUOTE="L0oD, post: 418280, member: 42867"] Magnesium Deficiency Problem: A light green or yellow coloring will begin to show on the veins and edges of the lower & older leaves - this is one of the classic signs of cannabis magnesium deficiency. Magnesium is a mobile nutrient, which means that the plant can move it from old leaves to new leaves. If you don't react to it promptly, a cannabis magnesium defiency can spiral out of control and cause your plant to lose a lot of lower leaves quickly. The plant will pull magnesium out of older leaves and bring them to the newer leaves. That's why a magnesium deficiency usually appears towards the bottom of the plant and on older, less important leaves. [ATTACH=full]54230[/ATTACH] The edges of the leaves may become yellow or bright green and may start feeling crispy to the touch. This crispiness around the edges is different from nutrient burn,which does not lighten the margins inside the leaves.Sometimes you will also get light brown spotting within the margins or along the edges if the problem continues to get worse, though this may be partially other deficiencies, which often happen alongside a magnesium defiency. Magnesium deficiencies are easy to prevent and fix once you know what to do. Read on below to learn how.[ATTACH=full]54235[/ATTACH] [ATTACH]54236[/ATTACH] [ATTACH]54237[/ATTACH] Solution For Magnesium Deficiency in Cannabis Your cannabis plant may show signs of a magnesium deficiency if the pH at the roots is too low,especially in hydro. That is because when the pH of your root zone is not in the correct range,your cannabis cannot properly absorb magnesium through the roots. Often with this deficiency, the magnesium is present, but the roots cannot absorb the magnesium properly due to an improper pH. Therefore it is very important to maintain the correct pH (and make sure the pH does get to low / acidic) in order to avoid a magnesium deficiency. Growers using Coco Coir or Reverse Osmosis (RO) water usually need to supplement their plants with extra Calcium & Magnesium in addition to regular nutrients. Treating coco coir with Cal-Mag and supplying extra throughout your grow is recommended for grower in coco coir, or those using RO water. Adding more magnesium to a system when there is a pH lock-out will probably not help because the plant will not be able to absorb any magnesium until the pH has been corrected. If there's already enough magnesium, adding more can cause other apparent deficiencies by locking out other nutrients from the plant. Please note: Once a magneisum deficiency is cleared up, the problem (yellowing lower leaves) will stop spreading to other older leaves, usually within a few days. Please note that leaves which have been damaged by a magnesium deficiency will probably not recover or turn green, so you want to pay attention to other growth for signs of recovery. In soil, magnesium is best absorbed by the roots in the 6.0 - 7.0 pH range(some growers say a 6.5 - 7.0 pH is best if you suspect a magnesium deficiency) In hydro, magnesium is best absorbed by the roots in the 6.0 - 6.5 pH range(in hydro, it's generally recommended to keep the pH between 5.5 - 6.5,but magnesium specifically tends to be best absorbed above 6.0) If you suspect your growing cannabis plant has a magnesium deficiency, flush your system with clean,pH'd water that contains a regular dose of cannabis-friendly nutrients that includes magnesium. This will remove any nutrient salts that may be affected the uptake of magnesium and help restore pH to the proper levels.. To supplement with extra Magnesium... Calcium, magnesium, and iron deficiencies often appear together in cannabis.Many growers decide to purchase some sort of Calcium-Magnesium (often called Cal-Mag)supplement for their grow room in case one of these common deficiencies appear. Listed below are common cannabis Calcium supplements,along below with some general information about each one. After supplementing with Cal-Mag and correcting the pH, you should expect to see new healthy growth within a week. Remember, the old leaves will probably not recover,but new growth should be green and healthy. Hand-watered grow - Flush the system with properly pH'ed water that contains a full set of proper nutrients that are suitable for growing cannabis. Make sure you are using the right nutrients for the stage your plant is in. Check the pH of your runoff water to ensure that nothing in the growing medium is throwing off the root pH. Hydro grow - Check the pH and PPM of your reservoir water to make sure that pH is on target and nutrient levels are not lower than expected. If you do this and are still not certain what is causing the magnesium defiency, it is recommended that you drain your reservoir and refill with a newly mixed reservoir with fresh nutrients that has been pH'ed. Adding extra magnesium is often not necessary if you are using tap water. However, you will likely want to supplement Cal-Mag if you are using filtered or reverse osmosis (RO) water,since most tap water already contains some amount of all 3 of these cannabis nutrients. Cal-Mag also has a small amount or iron, which is another trace cannabis nutrient that is often missing in filtered water. How long until new growth looks better? If you fix the root of the problem, further yellowing and discoloration of the leaves should stop almost immediately. Some of the effected leaves may recover somewhat, but what's most important is to make sure the problem isn't continuing to spread to other leaves on the plant. I generally don't remove any discolored leaves until I know for sure that the problem is completely gone and is no longer spreading to new leaves (that way any possible further discoloration will happen to the leaves that have already been affected). Leaf Color: Edges Appear Brown or Burnt Pale Color Leaves Yellow Leaves - Lower, older leaves Yellowing Between Veins Veins of Leaves Stay Green Brown or Dark Spots Mottling / Mosaic Pattern Leaf Symptoms: Lower Leaves / Older Growth Affected Leaf Tips Appear Burnt Leaf Tips Die Yellowing Between Veins Veins of Leaves Stay Green Spots Mottling / Mosaic Old Leaves Dropping Off Twisted Growth Leaves Curl Under Leaves Curl Upwards Wilting / Drooping Plant Symptoms: Old Leaves Dropping Off Twisted Growth Leaves Curl Under Leaves Curl Upwards Plant Wilting / Drooping [/QUOTE]
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