A limited amount of nitrogen is a one of the more prevalent nutrient deficiencies amongst marijuana plants. Nitrogen is definitely a very essential nutrient for marijuana.
This is element is specifically in charge of creating chlorophyll and amino acids, which is necessary for the photosynthesis process.
Your plants tissue is comprised mostly of nitrogen, so with that being known the growth of your plant will cease quickly if there is ever a deficiency.
The deficiency begins in the lower leaves when they start turning pale green. Then the leaves will become yellow and begin dying off as the leftover nitrogen moves to help the newer growth. Nitrogen is able to travel throughout the plant as necessary.
The deficiency will move upward and the only part of that plant that will look green is the newer growth on the top half. The lower leaves will become yellow and wither. When a leaf is dying, it begins at the tips and moves towards the inside.
Signs of a nitrogen deficiency
If the lower leaves are becoming yellow during the vegetative phase or early on in the flowering phase, your marijuana plant may have a nitrogen deficiency that needs to be dealt with.
Losing a couple of leaves from the base of your plant from time to time is common, and more so with large plants. Now, if the plant is losing a large portion of yellow leaves, and the yellowing is traveling upward fast, you have a serious issue here.
The amount of nitrogen in comparison to other nutrients plays a big role in the growth and producing buds. The plant may display signs by the leaves getting little, less growth, and the plants appear to not be thriving. The petioles and stems will be a somewhat red or purple shade.
Too much nitrogen gives you plant a thick, dark green look, but this leaves it more defenseless to diseases and bugs. Another thing is the stalks begin to be deprived of elasticity and fragile.
It is good to know that it is common for the leaves of marijuana plants to turn yellow around the end of the flowering stage when the plant is lacking nitrogen because it is producing buds.
Tip: make sure to download my free Grow Bible for more information about how to fix Nitrogen Deficiency
Now, if you notice your plant is losing lower leave quickly because of the yellowing, particularly during the vegetation stage, you have an issue on your hands that requires and immediate solution.
For the vegetative state, your plant requires a more nitrogen and just about any plant food will do the trick. The majority of the total plant foods offered at your local garden center has a large amount of nitrogen, which is great for the vegetative phase.
The flowering phase requires lower levels of nitrogen. It is very necessary to get a nutrient system that has lower levels of nitrogen for the duration of the plants life cycle.
It’s common for marijuana plants to display signs of nitrogen deficiency when the plant is approaching harvest time. This is a positive sign for your plant. An excess of nitrogen stops budding and lessens the entire taste and scent of your plant. This is the reason every “bloom” and flowering nutrient systems mostly have a low amount of nitrogen.
Don’t worry if you notice your plant is displaying signs of nitrogen deficiency later in the flowering phase. Low amounts of nitrogen is actually a good thing during the later phase of the flowering stage to encourage good bud production and will enhance your yields.
Not sure if your plants have a nitrogen deficiency? Read the article Nutrient deficiencies in marijuana plants for a list with pictures of all deficiencies.
How to fix a nitrogen deficiency
The best way to resolve a nitrogen deficiency is to use a water-soluble nitrogen such as Grow Booster so it goes straight to the roots. After fertilization, all nitrogen-deficient plants will absorb as much nitrogen as possible and the plant will go back to its bright green color.
Here are some more things you can try:
- Calcium nitrate (CaNO3) as a foliar fertilizer
- Fish meal
- Fish emulsion
- Cottonseed meals
- Feather meal
There are several pre-mixed nutrients you can find in the store that have nitrogen or even try using
List of marijuana plant sypmtoms
- Pale Color Leaves
- Yellow Leaves
- Yellowing Between Veins
- Lower Leaves and Older Growth Are Damaged
- Yellowing Between Veins
- Old Leaves Falling Off
- Withering / Sagging
- Old Leaves Falling Off
So, keep in mind that if you have already given your plants nutrients, then most likely there is not nitrogen deficiency. If there is evidence of the deficiency spreading after one or two weeks of giving it nitrogen, then you need to determine what is creating the yellowing. If it is close to harvest time, then don’t worry about yellowing because this is normal.
Closely monitor your plants and check for any issues so you are never caught off guard by a bad nitrogen deficiency. If you discover a problem and after proper treatment, your plants will heal in about 7 days are so, with an exception of the leaves that were harmed the most.
Remember that plants with strong genetics have less change of getting sick. Make sure you buy marijuana seeds from a trusted seedbank.
Thanks for reading. Please leave comments or questions below and don’t forget to download my free grow bible
The founder of I Love Growing Marijuana, Robert Bergman, is a marijuana growing expert that enjoys sharing his knowledge with the world. He combines years of experience, ranging from small-scale grows to massive operations, with a passion for growing. His articles include tutorials on growing... [read more]