For most cannabis strains, the flowering period will last about 7-9 weeks, although some sativas require even longer for their buds to mature.
This phase of flowering where your plant is starting to spend increasingly more energy on growing flowers is particularly critical. Make sure that the nutrients you give are appropriate and check the labels for the recommended dosages.
To properly feed your plants once they start to flower and to initiate the first signs of growing buds, you should check your nutrient manufacturer’s schedule. It is normally around this time at week 2 where you will have to increase flowering nutrients to help your plants reach their maximum yield potential.
What happens during flowering and at what exact time can somewhat vary depending on the particular strain you are growing. So don’t expect your plants to follow this schedule to the T; see it more as a general guideline that you can go by. Let us look at the flowering phase of cannabis week by week.
When the flowering period starts, it isn’t an abrupt change in your plants’ growth. Cannabis won’t just stop growing and then go into flowering right away. In these first weeks of flowering, many cannabis strains may indeed undergo a considerable growth stretch. This is important to know when it comes to feeding your plants properly, but also if you want to give them sufficient space to grow.
Your cannabis plants have still not entirely stopped growing and will now be about 50% bigger than what they were just three weeks earlier. Although still stretching a bit, the stretch will now gradually slow down and soon come to a complete halt.
At the locations on the plant where you previously saw some hairs, you can now see the first signs of real buds developing. There still won’t be many resin glands and trichomes on your plants, which means that the smell won’t be too pungent yet either.
When the light cycle provides your cannabis plants with longer hours of uninterrupted darkness, they enter the flowering stage. Your plants will stop growing and instead put their energy into producing buds (flowers). Outdoors, this will normally happen when the days get shorter around the end of summer. When you grow indoors, flowering will begin once you switch your lights to 10-12 hours of darkness.
Not all cannabis strains require the same amount of time for their flowering, but many varieties will be ready to harvest in these last three weeks. There are, however, not too many strains that will be ready before week 8.
What happens during the flowering phase of cannabis? Learn about flowering week by week. This guide will help you maximise flower production and THC content.
The first pistils appear
When liquid fertilisers are used, their nutritional composition in terms of NPK and the ratio of these 3 macro nutrients should be taken into account. With commercial bottled nutrients, the same flowering fertiliser is used for both indica and sativa, but with a dose that varies according to the week. So we won’t give the same amount of nutrients to the indica plants as to the sativa plants over the same time period, but we’ll vary them as needed.
At this time the plants have already switched hormone production to focus on creating buds. The nutrient levels required will vary depending on the variety being grown, whether more indica or more sativa, it will require higher or lower levels of nutrients. This is also ruled by the duration of flowering in the genetics cultivated. If it is a more sativa-leaning plant with a long flowering period, nutrient levels are usually lower with a slower and more gradual increase week by week. If more indica-leaning plants are grown, having a shorter flowering, these usually consume a larger amount of nutrients in fewer weeks, having less time to finish their flowering.
Mature trichomes ready for harvest
The weekly increase of potassium is essential so that the plant can continue to create more flowers and finish flowering with fully developed buds, covered with resin and with some remarkable aromas and flavours.
EC levels during flowering*
The nutrient charts are very useful as a rough guide to the nutrient concentrations week to week but it’s only through looking at the leaves, stems, roots, etc. that we can truly determine if the plants are properly fed, or if they’re suffering a deficiency or excess of nutrients.
We can also find certain fertilisers like Powder Feeding that are formulated specifically for long or short flowering varieties:
Between the 4th and 5th week of flowering we see how potassium comes into play. Now the plant has already formed the structure on which the buds will grow until the end of flowering.
Without a doubt, flowering is one of the crucial stages in cannabis cultivation. In this article we tell you everything you need to know about the blo