The majority of growers will never have to deal with this deficiency but if you do then this guide should give you all the information you need to combat this sickness.
In order to deal with this deficiency you need to be able to spot it early and take actions to bring your plants boron levels back up as a boron deficiency will usually be accompanied by other nutrient or pH problems so it is essential that you fix it. A boron deficiency is often accompanied by an apparent potassium or nitrogen deficiency, as these nutrients are needed for the plant to use boron. Boron deficiencies are more likely to appear when a plant is under watered or experiencing very low humidity.
Abnormal or thick growth tips along with brown or yellow spotting on new leaves are an early indication of this deficiency. Upper cannabis leaves will also experience slowed growth while new leaves have the potential to curl up and die. This is because a plant need boron to properly use calcium, this hugely impacts your plants new growth. You should remember that all deficiencies can be caused by the plant experiencing a period of stress and the deficiency can clear up when the period of stress has passed.
How To Fix A Boron Deficiency In Your Cannabis Plant
Manage Your pH Correctly
If the pH gets too high then your plant will not be able to take in enough boron, this is because boron is best absorbed at lower pH’s. Even if the boron is present near the roots, the plant will not be able to make use of it, this is why it is very important to maintain a balanced pH level to avoid a boron deficiency.
If you are using hydro to grow then you should be aware that the optimal pH level for boron absorption is around 5.5 – 6.2 pH. In soil it is a bit higher, you are recommended to keep your pH between 6.0 – 6.5 for optimal absorption.
Make Sure Your Plant Has Ample Moisture
When trying to avoid or fix a boron deficiency it is vital that you make sure your plant is getting enough moisture. If the plant is under watered or placed in an environment with a low humidity (below 30%) then it will not be able to absorb boron. These problems are pretty simple to remedy, you can solve any under watering problem by following a strict schedule and making sure your plants are watered every day, you may also need a humidifier in your room if it is too dry.
Using High Quality Nutrients
If you are using high quality soil or cannabis friendly nutrients then you will probably not have to add any additional boron to your plant as it will already be present. The only time a nutrient related deficiency may occur is when heavily filtered or reverse osmosis water is used to water the plants. This water has a lack of boron in it unlike tap water which has naturally occurring boron.
If you believe your cannabis plant does have a boron deficiency then you should flush the whole system with clean, pH’d water accompanied by a regular dose of cannabis friendly nutrients. Any part of the plant that has already been affected by the deficiency will probably not recover however the priority is to stop it spreading. You should keep an eye on the plant in the coming days just to make sure the deficiency is no longer spreading.