How to Determine Sex of a Marijuana Plant

How to Determine Sex of a Marijuana Plant

Determining the sex of cannabis plants is a problem that is often encountered. To determine the difference between a female and male cannabis plant you need to understand the hereditary functions of both plants. Understanding the gender of plants is extremely important for growers.

Male Marijuana Plants

Male Marijuana plants have grape-like balls which form and fill with pollen. The balls will first show up a week or two after changing the plants over to flowering.

Female Marijuana Plants

Female Marijuana plants take a bit longer than males to show their first signs after being changed over to flowering. Female plants start showing one or two wispy white white hairs where their buds are going to start forming. They usually first show up where the main stem connects to the individual nodes or ‘branches’. If a female plant is kept in the vegetative stage long enough (the length of time varies depending on the strain and conditions), then she will start showing the first sign of female hairs even before you move the plant into the flowering stage by changing the light schedule. If you see wispy white hairs appearing on your plant like the ones pictured below, then you know you have a female plant.

How to Determine Sex of a Marijuana Plant

  1. You can wait until your plants naturally show the first signs of their gender and then remove all the males, but that means you have to watch the plants closely the whole time. You also will waste time and energy growing plants only to find out that some or all are male and have to throw them away. If you want to be more proactive and get rid of all male plants right away, then use this technique.
  2. Take a clone from the unverified marijuana plant
  3. Label both the clone and the mother plant so you know which clone came from which corresponding mother. If you don’t label them clearly, then all your effort will go to waste!
  4. Once the clones have established roots, change just the clones into flowering mode by providing them with a light schedule of 12 hours on, 12 hours off
  5. The clones should start revealing their gender in a week or two. Males will start developing balls and females will start developing white hairs. Click on the pictures below to see some examples of male and female plants.
  6. Once you have determined the gender of your clones, you should make sure you throw away any corresponding male plants.