Too Much Light = Burned, Crinkled Leaves
A nutrient toxicity is most common in dry or hot conditions, when starting in "hot" soil, and when plants are underwatered.
This seedling is stretching too tall, with a lot of space in between sets of leaves, and a long thin stalk. This is caused by the plant not getting enough light. It’s “reaching” upwards, trying to find the sun.
If you’ve started your seedling in a big container, it’s good to be worried about overwatering young seedlings. In a large container, it generally takes a relatively long time for the growing medium to dry out, and your seedlings aren’t drinking much. Therefore it’s easy for them to get waterlogged. In this situation, you can use a spray bottle or a mister to mist the area around the plant thoroughly, which will seep down to the roots and keep them wet, but won’t soak the soil. Another option is to use just a small amount of water, maybe a cup at a time, and water in a circle around your plant until it starts growing vigorously. Giving seedlings just a bit of water at a time prevents them from getting drowned in drenched soil.
Question: How do I avoid germination problems?
After giving enough light, growers can bury the extra stem, or just wait until the seedling grows out of it on its own
For fastest growth rates, it's better to plant young seedlings or clones in a very small container, like a disposable plastic solo cup.
As they get older, the leaves start looking more like the cannabis leaf you are probably most familiar with. Here's what those seedlings look like as they start growing into healthy young cannabis plants…
Very dark leaves often indicate a nitrogen toxicity (too much nitrogen)
If you are seeing any of these symptoms, it’s most likely the problem is being caused by any poor drainage or watering too often.
Giving too many nutrients at a time can cause problems overnight, so we recommend watering your seedling with plain water and taking a look at the following table so you prevent any seedling problems related to nutrients.
The ideal water for seedlings
Problems with seedlings are common and can end up affecting them further into their life cycle so it’s vital you detect and fix them as soon as you can.