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The Cannabis Grow Bible

by Greg Green

Plant problems and how to solve them

marijuana plant problems

Before we begin we should tell you what a chemical burn is. A chemical burn is what the plant suffers because of over-feeding. A chemical burn can be compared to a half-smoked joint. At the tip of the joint you have this shrivelled grey ash, in the middle you have the burn creeping towards new paper which leaves a pattern behind it, and then you have the part you have not smoked yet. A plant burn looks like this almost. The plant sucks up the water and the food. It distributes these elements to the leaves at the bottom first and then works it way up the plant. This process takes days to work as you know FROM WATERING and WHEN TO WATER! The damage starts at the tips of the leaf and slowly moves to the centre of the leaf, leaving behind it some crispy matter that flakes away between your fingers. This is what a chemical burn looks like. A nutrient problem does not look burnt. A nutrient problem looks like a cell collapse with discoloration. The part may wither and die, but it should not look burnt. That is major difference between a chemical burn and a nutrient problem. In time you should be able to tell the difference for yourself.

Also check your pH. If your pH is not right, then solve the pH problem before you go and do anything else.

A) Look at your problem and quickly search for any bugs. When you have completed this search, eliminate any bug problems by using the advice in the bug chapter. Also note the type of attack to make sure that it is not a bug problem AND is a nutrient problem, which can happen. Do your leaves look sucked and dry? Do you have any black dots on them like bugs? Try to tell the difference between a bug attack and a nutrient problem. Nutrient problems damage the plant on a somewhat consistent level. Bug attacks are less consistent in the damaged generated. They leave damaged patches everywhere on your plant.

If the problem seems to affects only the lower portion of your plant and or a bit of the middle then read B). If it is only effects the top of your plant and the tips then you should go to J). If the plant is covered with the problem then go to F).

B) If your plant is in vegetative growth and the leaves are going very yellow, then you need more Nitrogen. If your plant is in flowering and you have stunted growth, yellow leaves and it looks to be dying then you need more Nitrogen. If your plant is in flowering and does not look like it is dying but looks red or dark green/yellow then you need to treat it with more P, which is Phosphorus. If these do not help then go to C.

C) If your plant has leaves that are curling up, twisting and are going yellow then check to see if your light is burning them or if the grow chamber has enough air circulation. If this is fine then you need to consider adding more Mg which is Magnesium to your plants. Epsom salts are good – 1/4 – 1/3 table spoon of Epsom salts to 3 gallons of water is fine. If you still have a problem go to D).

D) If the tips of the leaves turn brown and curl slightly then you are looking at a K problem which is Potassium problem. If not, move onto E.

E) Does your plant look wilted? Maybe you over- watered? If not, go to F.

F) The veins are green, but the leaves are yellow. This is an Iron problem, Fe. If not, move on to G:)

G) Leaves are not twisted but are yellow at the base. The tips are fine. This is a Manganese problem, which is (Mn). If not, move on to H).

H) Still haven’t solved it? Then flush your soil and find another type of plant food that has all of these. N, P, K, Ca, Mg and S. Get Epsom Salts and get a small canister of micronutrient. Iron, boron, chlorine, manganese, copper, zinc, and molybdenum. Try using a nutrient mixture that we have already mentioned before in the indoor feeding section.

marijuana plant problems

Cannabis Grow Bible

20 comments to Plant problems and how to solve them

  • tim c

    what should the high and low for ppm be ?

  • A.C.

    I have the leaves problem on some plants, (not all)BUT…I am 6 weeks into the flowering stage and some of my buds are turning brown in the middle…what am I doing wrong ?? Any thoughts or help ??

  • Janedoe

    HELP! My auto flower is 6 weeks old and all of a sudden the leaves started to droop. The next day they were way worse, curled and dry. All over. There hasn’t been any changes. It’s as if it’s dried right out but it shouldn’t be. I watered it last night, then again today. What could be the problem?

  • Derek

    I’ve been using Ph perfect it works awesome. I had someone water my plants they didn’t get the concept and added Ph down anyways. Now all my plants are curled in badly they had a few weeks till they would go in to flower. Now I’m not sure if they make it. Please help!!

  • robert wilson

    Will a neighbors security light effect the flowering stag? The bottom of my plant looks verygood and the litte bit of the plant that is gettig the light isgreen and no pistils?!

  • lbezphil2005

    Look, most of you are overwatering – a cannabis plant has to dry between waterings, so when you stick a finger into the soil and pull it out the dirt doesn’t stick to it – if it does its still too wet!! in a 3 gal smart pot I might water every 2 or 3 days during flower, that’s it. cannabis needs good drainage – if the medium stays too moist too long you will get root rot. you guys whose plants are turning brown and crap, that’s the reason. too much moisture and too much feed, you’ve burnt your plants to a crisp. keep it simple, less is more – if the bottle says 5ml per gal make it 1 to 2ml at first until you see how your plants react – not all plants are heavy feeders, the more sativa the less they like nitrogen. do some reading, join a cannabis grow forum like grasscity or icmag or skunkmag, I don’t care – just educate yourself on what you are doing. growing cannabis is fun, challenging, and when its finishing pretty damn awesome – I have seen some of the most beautiful plants, turning from green to copper to a brilliant reddish purple, deep dark almost black purple, to a light almost lemony red with pink trichomes. when you learn what you are doing and give the plant love – not sit and think money money money but love the plant for what it does, and it will give back 10 fold. I have yet to have a bad plant.

  • Debbie

    my girls were doing so good tell about couple weeks ago the lower branches are getting long and but leaves are tiny and curly.

  • Miss London

    Hi there,

    I am almost losing a couple of plants from wilting. They are on vegetative state, no bigger than 30cm tall. The soil felt parched dry, even crumbling but the plants were just fine, but still I decided to water them. I’ve added a teaspoon of water straight into the roots of each plant, and they all wilted.
    Before that I haven’t watered them for over two weeks. I decided to water them as they weren’t growing as fast as I expected.
    It’s my first grow, so one more rookie question:
    How long before I can start watching for the plant’s sex? I planted those plants 60 days ago more or less, but I cannot find anything that can identify their sexes yet? Is it too early?
    Cheers

  • Anonymous

    Reduce the hours and they will begin to sex… Water the whole plant not just roots .. And allow to dry

  • teddy

    Will my girls recover if they have root rot? They are very small for there 6 weeks alive.some wilt badly some seam ok someday and some are very strangely curling up but not like claw more long ways. What can i do?

  • Jc

    Hi I have a ? For you pros out there I have autos going and the bottoms seem to be full and ripe while the middle and top don’t seem even close what could this be any help would be awesome

  • jason

    My leaves are turn in red at the tips then yellowing and dying also the stems are red as well what the problem and what do I do helppp??????

  • rich

    Plant- blue mystic, indica dom. 1 1/2 old using potting soil for medium with very low nutes in it. have not supplemented yet cause plant looks very healthy overall but the secondary shoots sprouting r very droopy. ive been watering once a week so I don’t believe its due to overwatering. could this be a nute def. or something else

  • wes

    Hey I’m growing for the first time so I’m not real sure what I’m doing. My bottom leaves are wilting and everything up top is turning kind of a light green color through the middle. Any thoughts or suggeztions?

  • janr

    Wow e got leaves that are turning yellow w/ black dots like overnight. Is it too much water? My soil is organic and Jude purified water and once a week trace minerals from a well. The plant is 32 days old and I have also been topping it. Is topping a good thing? It sure grew fast t except for the leaves it is moving right along. Thanx for the help:)

  • GardenConnection

    All of you having curling leaves and browning buds need to get a 50x or higher scope and look and see if you have RUSSET MITES. These microscopic bugs have hit us hard the last 2 years in northern cali…..Treatments seem to be sulfur fungicides, and mycotrol-o. Hope this helps.

  • concerned

    My plant is 1 1/2 month and about 2 foot tall. Well here recently the top leaves look like they are having problems fanning out properly.. Also the bottom leaves have few yellow spots around the edging n a few holes like a bug has gotten a hold of it with yellowing around the holes. What do I need to do to fix this immediately.

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