Dial in feeding. Easier said than done right? Wrong! Almost every brand of well-known cannabis fertiliser offers a feeding chart free to download from their respective websites. Granted, not all cannabis varieties will respond in the same way to fertilisers.
Genetics are the cause of all kinds of cannabis leaf deformities and mutations. Some strains occasionally have a tendency towards curly leaves or other odd traits. Most growers will thin out these plants. All the shrewd cultivator can do is write it off as bad luck.
Indoor growers must constantly maintain the optimal environmental conditions. This starts with optimal light distance. The only way to keep the plant canopy in the sweet spot is to measure and adjust until mature plants peak in height during mid-late bloom, depending on the strain. Moreover, indoor growers can utilise air-con and fans to keep the grow-op cool.
Cold temperatures can cause curly cannabis leaves too. Eventually, all kinds of leaf discolouration will develop. Sure, cooler nighttime temps late in bloom can add a dash of purple charm to buds, but prolonged exposure to temperatures below 10°C will kill your plants. Flowers will be loose and leafy if plants even make it to harvest. Coupled with high RH, buds will be moist and become vulnerable to Botrytis, AKA bud rot.
Indoors, if temps are too low, you can always add more grow lights and turn a negative into a positive. Outdoor growers might consider an early harvest, or if possible, moving plants indoors at night. Cannabis is a hardy plant species, but outside of the optimal 20–28°C temperature range, leaves will curl or claw.
Heat stress can occur indoors or outdoors. If you see curling and nasty-looking brown fringing, your cannabis leaves are sending you a distress signal. Cannabis plants can photosynthesise efficiently at moderate temperatures up to 28°C. Anything above 30°C and your plants are in the danger zone. Combine this with low RH and you’ve got real problems. New leaves will grow gnarly and old leaves will curl yellow and maybe even burn to a rusty, brown crisp.
There are numerous reasons why you might find curly cannabis leaves in your grow-op. This guide will explain why this phenomenon occurs, and what you can do to prevent it from ruining your final product.
“Water mould” microorganisms are just like vampires; you have to invite them in before they can do any harm. Keep them out of the garden by making sure they are not welcome. Maintaining an effective wet-dry cycle is all it takes. If you can pick up your pots, do it. Then you can tell by their weight when it’s time to water.
Cannabis plants can’t vocalise a call for help—but they can send signals to tell you all is not well. If you see leaves either clawing or curling, there is trouble with the trees. Don’t ignore their pleas. This blog will help you identify the causes and cures for curly cannabis leaves.
Cannabis leaves curling or clawing are signs your plants are suffering. Something is going wrong in the garden. This blog will help you save the stash.
Not enough water can cause this symptom, but if it does not correct itself after a good drink, this is not likely the issue.
If you are growing these plants in containers or planting beds and not hydroponically, make sure that the media you are growing in is well-drained and porous so that excess water can drain through. A moisture meter can help to identify how wet your media is and whether or not this may be the cause.
There are several possibilities regarding what could be causing your curling leaves. Curled leaves that are not accompanied by any necrosis or browning of the foliar edges may be attributable to nutrient excess, insect damage, water, other cultural issues, or even possibly the genetics of your plant.
There’s a slight curling of the outer edges of the top leaves of my plant seven weeks into my indoor grow. What should I do? No burning on the tips or anywhere else.
Several different species of mites, including Broad mites, Cyclamen mites, and Russet mites may be feeding on your plant leaves and leave curled leaves in their wake as a result of a substance that they inject into the foliage while feeding.
Generally, though, there will be other symptoms appearing shortly after you notice the curling such as a change of color (yellow to brown) or a speckled appearance to the leaves.
Another likely culprit that can be easily checked and remedied is if you are growing these plants in pots and if they have become root-bound. If this is the case, scuff up the roots and pull them away from the root ball before transplanting them into a larger container.
If none of these seem to be the cause of the leaf curl that you are experiencing, the symptoms may be caused by a mite infestation.
Your plant may also just be showing signs of stress due to cultural factors. Is the curling just on one side? This could be an environmental problem due to continual and proximal exposure to a fan.
There are several possibilities regarding what could be causing your curling leaves. Curled leaves that are not accompanied by any necrosis or browning of…