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my germinated weed seed has leaves

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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.

Seedlings suffer greatly from being underwatered, even more so than from overwatering. Often the grower will actually be able to see how dry the growing medium is. A big sign that the plant is being under-watered is when you can see the soil separating from the container. In this case, you can see the starter cube separating from the soil because it's so dry.

When there's too many nutrients, the plant can start getting light colored because some nutrients are getting locked out. The tip burn on the leaves is a good indicator that this problem is caused by too many nutrients. Also this grower started with a "hot" (nutrient rich) soil mix, and there's no way a plant this size could have already used up all those nutrients.

When a plant's roots are sitting in water, they quickly use up all the oxygen until the growing medium starts to dry out. Without enough oxygen at the roots, the plant will start showing symptoms of oxygen deprivation. Luckily, there are many steps you can take to prevent overwatering your cannabis plants.

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.

2-3 gallon container

Sometimes the leaves sort of fold downwards due to heat, too, like this seedling

c) some or all of the seeds cracked open and the taproot appeared – but there was no further growth.

Germination Problems

Many growers make the mistake of thinking that they need a high ambient humidity for germination or seedlings. The high humidity and lack of fresh ventilation quickly causes fungus in the soil or growing medium and the seeds rot!

Ensuring Authenticity

A very small percentage of plants turn out to be triploids (ie. have three sets of leaves) among thousands of specimens. This does not impair plant health and is a feature unique to cannabis as a plant species (ie. not restricted to our genetics). For more info on triploids please see our FAQ. Also very rare, but not a reason for concern, are twins. These appear when there are two embryos in one seed. If both seedlings are the same size you should separate them quickly before roots get entangled and then you have two plants for the price of one! If one seedling appears inferior just remove it. If a seedling has fused cotyledon leaves or a young plant has fused leaf tips on a leaf this is nothing to worry about and it has absolutely no impact on growth or flowering. Nature is always trying out new combinations and that cannot be prevented in selective breeding.