What Causes Curling Weed Leaves?


Another frequent reason for curling is overfertilization. If you take a heavy-handed approach to nutrients, this will be an issue. Your continual requirement to dose your plants excessively will cause them to curl. They might even canoe from time to time. Looking to try something new? Check out this.

Overfertilization with phosphorus and potassium during flowering will cause curled cannabis leaves and burned tips, so don’t overdo it. In the end, Chlorosis is a typical indication in both situations. So, to fix this problem, simply adjust the feeding. Most cannabis dispensaries offer feeding guides that you can download from their websites.

However, not all cannabis strains are created equal, and they will react in a similar manner; nevertheless, you should still follow the chart as a reference. As a result, the motto is to start low and take it slow.

You can gradually increase the dosages as long as you don’t notice the leaves curling. As a result, the ideal approach to go is not to plunge right in at full strength, because this will eventually kill your marijuana plants. The correct PH for your nutrient solution should be 6.0 pH or 5.80 pH if you’re using hydroponics.

Bad soil

To avoid overwatering and underwatering your cannabis plants, start with excellent soil or coco coir. Bad soil is often substantial and mucky. Even if the plants in bad dirt are given lots of water, they will droop and curl their leaves downward.

Consider three variables while assessing the health of your soil: drainage, water retention, and texture. Your plants will not be able to maintain ideal oxygen levels, retain water, or absorb nutrients if they don’t have adequate soil. Overwatering can cause soil to deteriorate since wet soil becomes murky and susceptible to mold. Black dirt has a loose texture and is in good condition. Unfortunately, there isn’t much you can do after the soil has gone bad.

To avoid exacerbating the problem, allow your soil to dry completely. However, you may avert it in the future. Small pebbles or pearlite might help with texture and aeration while also allowing drainage by adding them to your soil mix.


Weed leaves curling down is frequently associated with windburn. Plants that are subjected to extremely strong winds for an extended period of time may curl inwards to protect themselves. If your leaves are curling because of windburn, you may notice black spots on them that appear to be burned.

You should also be able to observe the flow of air in your garden. Windburn is most likely the source of curling in a location with a lot of wind. When fans inside an indoor grow are blowing too hard, windburn can occur. If you’re an outdoor grower and your plants are getting burnt by the sun, consider placing a windbreak around them.

Temperature Are Too Hot Cold

The cold can also harm curly cannabis leaves. All sorts of leaf discolouration will eventually emerge as a result of this. Sure, colder nighttime temperatures late in bloom might add a touch of purple beauty to buds, but prolonged exposure to temperatures below 10°C will kill your plants. If plants survive until harvest, flowers will be flaccid and full of holes. High RH levels coupled with chilly conditions promote bud wetness and susceptibility to Botrytis disease, commonly known as bud rot.

Indoors, if the temperature is too low, you may always add extra grow lights and turn a negative into a positive. If possible, outdoor growers should consider an early harvest or bringing plants inside at night when temperatures are cooler. Because cannabis is a hardy plant species, leaves will curl or claw if outside temperatures fall below 20–28°C.

How To Fix Curling Marijuana Leaves?

To prevent your cannabis from curving up or down, figure out which cause is to blame (excess watering vs. insufficient fertilization). If there are leaves curling up at their tips and yellowing between the veins, the plants aren’t getting enough nitrogen. You may need to use organic cannabis fertilizer in this case.

If they curl up from the stem and have brown tips, it’s likely that you’re overwatering. If this happens, all you have to do is cease watering for a few days until the plant has recovered.

The amount of water your cannabis requires varies based on its size, light exposure, humidity levels, and growing medium. While there are no hard-and-fast rules regarding how much water to give your plants each day if they are wilting as a result of over-watering at any time during their life cycle, you should reduce the amount of water supplied every day until they cease to wilt.

If your cannabis is curling down, it’s probably because you didn’t give it enough water. What’s the difference? If your plants droop more than usual and don’t perk up after being moistened but instead get even worse afterwards, this might be a sign of an over-drafted plant. What should you do if this occurs? Try stopping watering for a few days to give the plant some rest!

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