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marijuana seeds stretching

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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.

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.


• Too much heat/light: Seedlings are very sensitive, and too much light can be just as damaging as too little. Burnt, crinkled, or upward-folded leaves are classic signs that your seedlings are receiving too much light/heat. Follow the lighting instructions we mentioned above to ensure your little ladies don’t suffer from light stress.

Cannabis seedlings develop long, stretchy stems when they’re lacking light. In an attempt to get more light and keep growing, the seedlings put all their energy into developing a long stem rather than foliage. This is a natural survival mechanism that, in nature, helps the plant grow taller than others around it in order to soak up as much light as possible.

• Avoid nutrient burn: Seedlings can easily die if given too many nutrients. If in doubt, avoid feeding your seedlings until they’ve entered the vegetative growth phase and developed a few full-fingered leaves.

Fix stretching in cannabis seedlings, and prevent it from happening again.

Soon, you should notice your seedlings developing healthier growth. Short internodes and compact, green foliage are all signs that your seedlings are growing perfectly.

Understanding the Seedling Phase

Thinning is a common agricultural technique that’s often forgotten among cannabis growers. As the name suggests, thinning is all about reducing competition among your plants by “thinning” out the population.

While cannabis seedlings like warm, humid conditions, too much heat can cause a plant’s leaves to grow slower than its stem, resulting in tall and stretchy growth. To promote healthy seedling growth, we recommend keeping the temperatures in your grow room or dome at 19–20°C during the day and roughly 13°C at night.

Growing your seedlings under lights with a high percentage of red light may cause them to stretch. Blue light, on the other hand, helps to keep internodal spacing to a minimum and encourages plants to grow nice and stocky from the get-go.