Posted on by Jason G

Why are my leaves curling upwards?

When starting out a new gardening project it can take a few weeks to get everything right, some start of perfectly and others don’t so this tutorial is to help those that are struggling thus far.

Firstly, if you haven’t read the humidity (Link here) or temperature (Link here & here) blogs you should probably read them first as they will help develop a better understanding while reading this current explanation.


So, your seedling or juvenile plant has some upturned leaves, why is this?

In the presence of high temperature and low humidity without human interaction, plants will over transpire (bleed water) to try and level the saturation pressure within the environment.

When this happens, major changes take place not only in the environment but within the plant and the root zone.

Feeding a plant that doesn’t have the ideal conditions can cause a multitude of issues: 

  • Toxicity/deficiency
  • Soft plant tissue & weak stems
  • Metabolic shut down
  • Over worked stomata


These issues if not corrected will cause most plant varieties to die back, they may reshoot at the base of the stem as a last-ditch effort to stress response but in most cases its over as quick as it starts.


So, how can I fix my humidity issue, my temps are fine?

The quickest fix in this scenario is a humidifier, they will change a rooms humidity from 35% to 65% within 5 minutes of operating, once the humidity remains a stable 58-65% you will find the leaves will slowly uncurl and flatten out, the stress period the plant may go through could be up to a 2-week period as it is trying to recover, so be patient.

The team at A-Grade also advise that when feeding is to resume that you use 25-35% less nutrient solution than you were previously using to make sure we are not further compounding any current nutritional issues as a consequence of the initial problem.