Posted on by Jason Gibson

The Importance of Boron in flowering crops

Plants expressing deficiencies is also the plants way of communicating with us, think of it as their language.

The more you become familiar with certain varieties, recognizing abnormal signs becomes much easier.

When a plant becomes deficient, they naturally start to translocate nutrients to the newer parts of the plant to sustain new growth, left unchecked the plant will rapidly consume itself and die. (see nutrient mobility tutorial)

In vegetating & flowering plants, Boron plays a crucial role in the plants life cycle.

Boron (B) helps move sugars from one part of the plant to where it is needed, it is used in cell wall synthesis and works in conjunction with calcium, these elements are critical for cell division. As a plant shifts focus to reproductive growth, a higher amount of boron is needed.

The boron deficiency is immobile and shows itself as damage in new growth starting at the tips, eventually affecting the flower development.


How do I fix a Boron deficiency?

Firstly, we recommend that you flush the plant pot with plain pH’ed water:

If using Coco coir as a medium flush with a pH of 5.8-6.2

If using soil as a medium flush with a pH of 6.4-6.6

While you wait for the run off to slow down (approx. 15mins after flush) prepare another bucket of water and either add in the Boron element as directed on packaging or alternatively use a liquid preparation which can be found here

Once you have made up your Boron nutrient solution, you MUST adjust the pH again, if you do not follow this step then Boron will be mostly unavailable to the plant, by correcting the pH range of the solution the plant will be able to absorb the element without restriction. Technically the range for Boron is quite broad making it absorbable at nearly most ranges however, we have found for coco coir based mediums the ideal pH is 6.2-6.4


Can I give my plants too much Boron? 

Yes, just as plants can become deficient they can also be given to much, or ‘excess’ if this happens the most common fix is to flush thoroughly with pH’ed plain water, the key here is to continually dilute the ‘excess’ element. After 2-3 days of flushing, you can start to re-feed your plant again, generally as soon as the newer growth starts emerging unaffected, you’ll be able to resume food.

If you still have problems after following these steps, I would advise coming into a shop and showing the team there some photos to see if the deficiency has been diagnosed and/or fixed correctly.