Foxtail or fox tail on cannabis: What is it and how to get rid of it?

22. 12. 2025

Hemp buds usually have a cone-shaped form that is uniform along its entire length. However, sometimes a so-called fox tail develops, which can be a result of genetics or poor cultivation methods. The fox tail is one of several problems you may encounter when growing hemp. In this article, we will introduce hemp fox tails, explain their causes, and advise you on prevention and removal of fox tails in your hemp plants.

What is Hemp Foxtailing?

Fox tails represent a type of aesthetic deformation that can be found in hemp plants. They occur in hemp where calyxes form on others, typically during the flowering period, to such an extent that they are easily visible, resulting in buds acquiring strange shapes. They appear elongated and look like they grow in clusters. Instead of the usual dense and rounded structure, the buds resemble a fox's tail.

Three Reasons for Fox Tails in Hemp

There are three main factors that can cause fox tails in hemp plants:

Genetics

Certain hemp varieties are more prone to developing fox tails compared to others. Some growers love these varieties because they can obtain uniquely looking plants with distinctive buds. In outdoor cultivation, fox tail occurrence is almost always caused by genetics. You'll more frequently encounter it in sativa varieties than in indica varieties, as they have more elongated bud structures and larger spaces between buds.

Light Stress

Hemp plants require sufficient light to grow. Cultivation lights that are too hot or hung too close to plant flowers can lead to high stress and subsequent fox tail development. Plants with this type of fox tail usually have bleached or burnt leaf or bud tips.

Heat Stress

Hemp plants thrive at temperatures between 20 and 30 °C. Excessive heat is harmful to hemp plants because hemp prefers constant temperature throughout the entire vegetative period. Large temperature fluctuations result in growth slowdown, negatively impacting yield. Prolonged temperature exceedance can cause fox tail formation.

Are Fox Tails Harmful to Hemp?

Fox tails do not necessarily mean something harmful, as they do not bring any negative impacts. If the given variety is genetically predisposed to this peculiarity, there should be no problem. It is essentially an aesthetic matter, and some growers even like the occurrence of fox tails.

However, some fox tails can get out of control and create large clusters at the flower's top, which can negatively affect proper flower growth and ripening, reducing overall yield.

How to Get Rid of Fox Tails?

If you are not a fox tail enthusiast or dislike the bud structure, you can solve this problem by adjusting the growing environment. Here's how you can proceed:

Set the Correct Temperature

When growing, it's important to pay attention to temperature in the growing space. If the growing room is very warm, adjust the temperature. With lights on, the temperature in the growing room should be around 23 degrees Celsius, with lights off, it should be five to seven degrees lower. To reduce heat, you can ensure additional ventilation to remove warm air or turn on air conditioning. If growing lights are at an appropriate distance and temperatures are not too high, you should not encounter fox tails.

Change Light Distance

Fox tails often occur when plants are placed too close to the light source. If you notice signs of bleaching or fox tail occurrence, place plants further from the light source.

Check pH

Always check the pH level of water and soil to prevent nutrient supply restrictions that lead to fox tail formation.

Can Buds with Fox Tails be Harvested?

Although buds with fox tails are less dense and therefore slightly lighter than normal buds, nothing should prevent you from harvesting them. You can still enjoy the results of your work, as hemp with fox tails is primarily an aesthetic matter.

Now you know how to deal with fox tails, and nothing can surprise you during hemp cultivation! Purchase seeds with THC content under 1% and start growing!