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cannabis seeding very tall

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Are your cannabis seedlings growing tall, with long stems and few leaves? This is a common problem that, when not addressed quickly, can kill your seedlings. Luckily, it’s easy to deal with.

After installing your lights, your seedlings should start developing thicker, bushier foliage. After a few weeks, they should develop some full-fingered leaves, at which point you can switch to stronger lights to support your plants during their vegetative growth phase.


If you notice your seedlings growing long and stretchy, you’ll want to act quickly. When caught early, you can usually avoid causing your plants any serious harm. If you’re too late, however, your plants may die from the lack of light.

Another common cause of stretchy seedlings is using the wrong grow lights. Many growers pop their seedlings under their regular grow lights at a distance to compensate for the light’s high wattage. As a result, the seedlings end up lacking light and stretch.

Next, you’ll want to address your lighting situation. The best solution for growing healthy cannabis seedlings is to position 40W compact fluorescent lamps (CFLs) roughly 5–7cm from the tops of your seedlings. One lamp usually gives off enough light to support around 3–4 seedlings. Just keep an eye on your seedlings to ensure they don’t get too close to the light source. This is a recipe for light/heat stress.

Eventually, or pretty quickly actually, your cannabis seedlings will not be able to stand upright on their own. They will get all crooked, floppy, and unstable because the thin stem cannot support the tall seedling.

If it is too hot, seedlings may also get leggy in order to try and get more air higher up above. Of course, this does not really work in an artificial growing environment, such as in a grow room.

3. Serious Issues Once Vegetation Starts

Short answer: seedlings can get really leggy, which means that they are way too tall, with really thin stems, and it’s usually due to issues with light. Generally speaking, if your seedlings are not getting enough light, they will get leggy.

If it’s your first time growing weed from scratch, you might be a little nervous, and yes, you have a right to be nervous, as there is a lot that goes into growing some righteous ganja.

On that same note, increasing the strength of the lightbulbs, or in other words, getting a stronger lightbulb may work as well, but you do need to be careful because seedlings are sensitive to light burn.