It is always exciting. You have set up your home-grow op. You have planted and germinated your precious seeds and the little green sprouts have finally turned into real plants.

But. Then. There. Is. No. Flowering.

We all know that without flowers, there are no buds, no payoff.

No need to panic though! It is actually a common enough phenomenon. The following is an easy-to-fix checklist of common problems that interfere with efficient bloom and bud production.


Cannabis is like any other plant. It needs spectrum energy to grow. When planted outdoors, cannabis follows a seasonal cycle in spring and summer. Flowering generally occurs in late summer. It is also triggered by the summer solstice (June 21st). After this date, days begin to shorten gradually. Longer nights are thought to trigger blooming. Blooming usually starts in early August.

If you are growing indoors, obviously the lighting cycle is man-made. If you are not successful in getting your plant to bloom, the first culprit is probably the light. You will need to tweak your setup to make sure that it gets the right kind and temperature of light for the right amount of time.

light schedule spectrum energy


Cannabis growers don’t need to be electrical engineers. That said, there are some basics to master when growing this plant. Blue spectrum light is best for vegetative growth. Red spectrum light is for flowering.

Particularly if growing indoors, investing in a red/blue spectrum LED light is one way to handle this issue. However, for those who do not want to invest in LED, merely changing the colour of the lightbulb at the right time in the grow cycle will do the trick.

Some growers leave their lights on 24/7 during the vegetative grow state. If and when the plants begin to show signs of stress, lessening the amount of light they get will help. 6 Hours of darkness is usually recommended.

Once plants get to a healthy size, growers can actually force the plant to flower by exposing it to 12 hours of red light and 12 hours of darkness. Be aware however, that even the smallest amount of off-cycle light during this process can stop the flowering process. Some people claim that a random flashlight beam can halt the process. Others feel that if lights are left on when they should not be for about a day, this should not adversely affect the growth. However, if the plants are left exposed to several days of extra light, be aware they will probably revert to a growing rather than flowering phase and you will have to coax them back.


Different cannabis strains mature and flower at different rates. This can to some extent be manipulated by indoor growers who match their lights to ideal growing situations for their personalised nursery. However, on top of this, it is also good to know your plant’s tendencies. Indicas will flower between 45 and 65 days. Sativa dominant strains take a little longer. They normally flower between 60 and 90 days.

vegetative growth sativa and indica


If your plant still refuses to bloom, there is a very good chance that you have the wrong type of cannabis plant. Only female plants make buds. Male plants only make pollen sacs. Because these can also pollinate your female plants, reducing yields and creating seeds, many growers discard male plants immediately.


There are some types of cannabis that are known as “autoflowering” varieties. This means that they will automatically start flowering, no matter how much or what kind of light they get. This is also one of the best reasons, particularly for beginners, those on tight budgets and indoor growers, to buy seeds from an established breeder.


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