The Flowering Stage of Marijuana Plants: What to Do

The flowering phase of weed is the time when all gardeners growing cannabis are excited about. After the flowering period is the harvest time. But before you get too excited, pay close attention to this stage of cannabis cycle. After the vegetative phase, marijuana will then about to enter the budding time. This is a crucial stage for the weed plants and the growers too. The sex of the marijuana plants can be determined during the flowering stage.

You have to know the characteristics of males and females. If you do not want pollination to happen and you want to preserve the high potency of the weed strain you are growing, immediately pull out the male weed plants from your garden once you see them. Learn how to identify marijuana sex by clicking here.

When growing cannabis, requirements when it comes to light and nutrients will vary during the vegetative and flowering stages. These two factors will determine the rate of bud production and overall success of your weed growing project.

Light Requirements during the Flowering Stage of Indoor Weed Growing

During the flowering phase of growing pot indoors, supply the plants with 12 hours of light and 12 hours of dark period. Do not put the lights on while the weed plants are on their dark period. This may cause stress on the plants, slow down the budding process and eventually affect the amount of buds to be harvested. For indoor weed growing, high pressure sodium lamps are recommended. HPS produces more heat so position the light well so as not to burn the top of your marijuana plants. Fluorescents are also a good alternative of HPS lamps because it is cheaper and has low heat output.

Nutrients Needed During the Flowering Phase of Cannabis

During the budding time of cannabis, the plants need high amount of potassium and phosphorus to increase flowering. The primary nutrients nitrogen, potassium and phosphorus are essential for the vegetative to flowering stage of cannabis growing in varying amounts. To promote stronger roots, prevent and correct other plant diseases, secondary nutrients may be given during the flowering phase.

If cannabis plants are provided with all the things necessary for their flowering stage, you can expect an abundant harvest, potency and quality buds from the marijuana strain you have chosen to grow. When growing cannabis, provide the plants with the right type and spectrum of light. Expose them to the right number of light and dark hours to ensure proper bud production. This is very necessary when growing marijuana indoors but not much of a concern when weed plants are grown outside.

For a complete growing guide, check the Growing Elite Marijuana eBook.


  1. My outdoor babies are in buckets mostly. They are fems i ordered from th UK pretty dissapointed.
    My girls are putting on cullas ? Is that the proper name ? They are looking good i just wondered what would kick them in the pants right now? Im in Missouri, you know the status !
    I have tick fever, joint pain, muscles aches,fatique. Also fibromialga, looking for the perfect strain too.

    • GMT Admin GMT Admin says:

      What strain do you have? I wouldn’t know what to advice you without knowing what you are growing. There are a lot of strains which are good for joint pain, muscle aches, and other stuff that you mentioned. There is no such thing as a perfect strain because it depends on your preference.

  2. Question –
    I have a couple of Purple Haze about 7 feet tall grown outdoors. They were started in May and 2 weeks ago have begun to flower with whiter flowers. There are white flowers on the tops as well as down the sides of the tops. The flowers are about the size of a nickel to the size of a quarter. The tricomes are about an inch long. They smell sort of green when touched.
    Will they smell green when they are ready to harvest? Do I have to wait until they turn purple? Please advise. Thanks!

    • Hi Tom,

      Thanks for stopping by in our website.

      You will know if they are ready for harvest by looking at their trichomes. Use a magnifier and check when the trichs turn milky or amber. If you don’t have a magnifier you can tell if they are ready to harvest by looking at the hairs. If most of the hairs are curled back and dried 60 to 70% then they are ready.

      Hope that helps!

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