How Many Weeks Should Cannabis Be in Flower?

How many weeks should cannabis be in flower

The number of weeks a cannabis plant will flower depends on a number of factors. One of these is the amount of light the plant gets. Another is the temperature. A third factor is whether the plant is fertilized.


Cannabis plants are typically in the flowering phase for six to sixteen weeks. The length of the flowering stage is dependent on genetics. If you’re planning to grow cannabis, you should be aware of how long it takes for your plants to reach their full harvest potential.

As the buds continue to grow, they are surrounded by trichomes. These glandular structures are responsible for generating THC and terpenes. They are also sticky to the touch. When they are ripe, they release pungent odors. This is why you should pick your plants before they rot.

In some cases, trichomes can change color. While it’s not possible to detect them with your naked eye, a jeweler’s loupe can help.

The color of trichomes can tell you a lot about how close you are to harvest. When the trichomes are white, they are immature. But as the buds mature, they can turn amber. Amber trichomes are indicative of overripe cannabis. During this time, the THC and THCA in the plant begin to degrade.

Trichomes can be seen using a magnifying glass. Their appearance can vary, but the majority of them are white. Occasionally, trichomes will turn brown.

You should also take note of the spacing between the nodes. Nodes are points on the plant’s stem and branches that have formed from the main stalk. Depending on the strain, trichomes may be present in clusters.

Ideally, you’ll want to harvest your cannabis after seven to 14 days. However, you don’t have to wait. Many indoor growers purposely introduce cool temperatures in the week leading up to harvest.

In order to get the most out of your flowers, you should start giving your plants the right nutrients. This can increase cannabinoid and terpene levels.


During the flowering stage, your cannabis plant will stop growing and focus its energy on making buds. Buds will start to form, and your plant will start producing trichomes, or white hairs, on its leaves. The buds will become bigger and larger every day. Eventually, your plants will reach the harvest point, and you will be able to harvest your cannabis.

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When you first begin growing cannabis, you may wonder, “How many weeks should my plant be in flower?” This depends on the strain you choose. Some pure sativa strains will only be in flower for eight weeks, while some indica strains can be in bloom for as long as ten weeks. Hybrid strains are a combination of sativa and indica strains, and can flower faster than their pure counterparts.

You can tell when your marijuana plants are in the flowering phase by watching their foliage. In the first few weeks, they will still be mostly green, but by week four, they will start to get a bit picky. Their leaves will start to change color, become discolored, and even drop off. They will also start to show some signs of stress.

One sign of a healthy plant is a clear and clean root zone. Soil is full of life, and fungi and microbes help break down nutrients and help your plant grow.

However, in addition to good soil and fertilization, you need to keep your cannabis grow room temperature and humidity levels in check. Heat stress can burn and bleach buds. And light stress can cause yellowing of the leaves.

Foxtailing is a condition that can happen to any kind of cannabis plant, but it is more common in sativa strains. There are two main causes of foxtailing: heat and light. If your sativa is in the foxtailing stage, try to correct the problem before it gets out of hand.

Light requirements

The average cannabis flower time is six to ten weeks. Depending on the strain and the growing conditions, the flowering period may be shorter or longer. Choosing the right timing is crucial for yields.

For the first five weeks of flowering, the cannabis plant will be in a vegetative state. This means that it will grow new leaves to strengthen its frame and create energy. During this phase, the plant will also produce flowers. A few of the main symptoms that the plant shows include yellowing of the bottom leaves, discoloration of the leaves and rapid leaf loss.

It’s important to understand that the cannabis flowering stage is the culmination of a long development process. Typically, an outdoor plant needs around six hours of direct sun each day to be at its best. Indoor plants require a minimum of eight hours of daylight a day.

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There are several ways to determine when a plant is ready for harvesting. Using a combination of methods is the best way to go.

Keeping track of the light-to-dark ratio is a great way to figure out when a plant is ready for the next phase of the growth cycle. Light exposure plays a key role in every stage of the plant’s life. If the light levels are too high, the plant will not be able to make the buds it needs to produce.

The most significant indicator that a plant is in its flowering phase is the increase in size of the buds. The buds start to get larger as the days lengthen and the plant spends its energy on producing them.

The best time to harvest a marijuana plant depends on your growing conditions and personal preference. However, most varieties are ready for harvest after eight weeks.


Keeping the temperature of your marijuana plants at the right level is crucial for producing the best buds. High temperatures cause bud growth to slow down and terpenes to evaporate. The heat can also burn the trichomes on the buds, reducing their potency.

During the light period, cannabis plants prefer temperatures between 70-85 degrees Fahrenheit (20-29 Celsius). The night time temperature should be at least 71 degrees Fahrenheit. This helps to avoid massive internodal growth and can make the buds denser.

When growing outdoors, cannabis plants do better in warmer temperatures. However, cold temperatures can be just as detrimental. If temperatures reach zero during the night, the leaves may chlorose, or develop a white powdery coating.

In addition, a warm and humid environment can create ideal conditions for mold to grow. Mold can infect the plant from the inside out, destroying the buds.

Temperature is important during the vegetative stage and late flowering stage. The best temperatures for vegetative growth are around 24 degC (75 degF). At this stage, the plants absorb nutrients through the roots. It is therefore important to ensure that the roots have the proper amount of oxygen.

During the vegetative phase, humidity levels should be kept between 40 and 70 percent. As the plant grows, it will need more nutrients to replace the moisture that has been lost. Using CO2 can help to increase the amount of nutrients that are absorbed.

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When the cannabis plants are in the flowering stage, the nighttime temperature should be about 22 degrees Celsius. A few degrees below this is OK. An electric heater can help keep the room at a comfortable temperature.

While there is no way to accurately measure the temperature of your marijuana plants, there are techniques you can use to keep it within the recommended range. For instance, you can use a swivel fan to distribute air evenly, or you can invest in a CO2 generator.


Many marijuana growers wonder when they should start feeding their plants. The answer is based on the specific growth phase of your cannabis plant.

During the vegetative stage, your cannabis will require a balance of nitrogen and potassium. This is to support the development of new leaves.

As your cannabis plant reaches its flowering phase, it requires a more concentrated intake of phosphorus and potassium. This helps promote the growth of trichomes on the buds. Aside from helping the plants absorb more energy, these nutrients also play a key role in the stabilization of the cell walls.

During the first few weeks of bloom, you should start giving your cannabis the nutrients it needs. There are several different fertilizer kits available to help you at each stage of the flowering process. Several brands have their own feeding calendars to ensure that your cannabis receives the right nutrients at the right time.

Depending on the strain, some will be ready to harvest in as little as 8 weeks. However, some will take up to 14 weeks. For this reason, it’s important to keep track of your nutrient regime throughout the entire growth process.

Aside from the nutrients your cannabis plant needs, you should also make sure that it has adequate water. Watering the plant too frequently can lead to burnt leaves. To avoid this, a hygrometer can help you monitor the humidity and temperature of your grow room.

Choosing the best fertilizer for your cannabis is not always easy. You’ll want to use a nutrient that is suited to your strain. It’s a good idea to begin with a small dose of the recommended nutrient. Increase the amount slowly until you reach your desired results.

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