VEGETATIVE STAGE: everything you need to know

Vegetative stagee can dictate the rest off your grow if they are burnt or even if they stay in this stage for too little or too much it all goes towards the final yield and the outcome you will get. after sprouting the seeds which should take between 2-10 days the seedlings should be there depending on how you have sprouted them and the conditions they are in not all off them will sprout.

For grows indoor you can keep your plants at a short stage and use methods like Sea Off Green when you shorten your Vegetative stage for a minimum off 2 weeks this will speed up your grow but won’t give you a huge yield it’s most used by growers that don’t have the most amount off room. However long you keep your plants in this stage the lights need to on 18 hours out off the 24. It is possible to increase for example 20-4 or 22-2 or even some growers use 24 hours lighting permanently. As long as your plants stay consuming this amount off lighting it will stay in vegetive stage having your light cycle on 24 hours and 0 darkness will make your plants grow faster but on the other hand increase your electric bill.

How To Take Care In The Vegetative stage

Nutrients- selecting your nutrients is crucial before starting your grow research your seeds and find out the best set to use. Always read the instruction on how much to use as without carefully measuring your nutrients you can possibly over feed which will stun your plants and can only be fixed by flushing them which delays the whole process and can also effect your final yield and the taste.

When your plants are in this stage it is extremely important to not try anything with the plant that could possibly damage or stun it. As it is early in the stage doing something like that can affect your grow completely bare in mind this is early in the stage and the plant has not grown a strong root system let alone canopy.

Allow your female plants to veg for a good amount off time. Grow them up the be at least “18” inches tall. Your plant should have at least 4-6 leaf branches before switching to flowering phase.

Bearing in mind how big you need your plants to grow. When using the same space, having a lot of plants will mean less time until the room is filled in buds. A smaller number of plants means the need for them to grow bigger and taller until the space is completely filled.

Temperature & Humidity

In this stage keep your plants in a nice environment and aim between 70-85°F (20-30°C) which will be perfect but is able to be maintained by fans and heaters. Never let your plants experience this stage in a cold environment.During this early stage off the plants aim to keep your humidity levels between 50-70% depending on the strain some can handle the higher humidity levels and actually some strains strive in 70%

During the Vegetative stage your plants may grow a lot of leaf mass in a nice cool environment with a humidity that should be between 50-70%. Plants aren’t only getting there water through the roots, plants can also pull water directly out of the air, with higher humidity in your grow space this allows the leaves to get more water straight to the plant. Until they are fully developed roots, low humidity in your grow tent can cause growth to be slower with your plants. 

Keeping it fresh

Make sure your grow gets a constant supply of fresh air so your plants get the CO2 they need. A flow of air that keep the tent or indoor grow cool is all the plants need to breathe better and excel throughout the grow it is an option to have your fans on a timer and have them on a 20 minute timer but I would recommend a constant supply as it also improves photosynthesis and how much nutrients would be absorbed. Also if your grow is a humid environment this can be reduced with a fan or three.

Usually the fresh air contains between 300-500 parts per million of carbon dioxide. In an outdoor environment this is constantly refreshed through natural means, allowing your plants to never run out of their supply. In an indoor grow on the other hand this natural refreshment does not take place, to boot, the optimal level of carbon dioxide content is 1,000-1,400 parts per million for cannabis plants. This optimal level is the absolute peak of potential production though, you can still achieve great results without it, it is only an aim for growers who not only want to keep air content fresh, but also push it to the absolute extremes with additional methods.

The fan above is one i use personally it is very powerful and if you have any issues with humidity this will decrease it, this fan is most efficient when using to hang from your grow tent/area. This covers more off the space and also keeps your electrics separated from the water lurking about. If you want a fan that rotates and also is a lot more quieter i would highly suggest this 12 inch desk fan as it covers more space as isn’t noisy at all, i use this to keep at the bottom off the grow to clear the humidity near my soil.

Watering your plants

Soil– In soil water when it feels dry at least a Knuckle deep into the soil make sure your pots can drain easily. Ain’t between 6.0 -6.8 pH for weed grows in soil.

Coco Coir– Water these at least every 1-2 days analyze how quickly they are drying up if they are drying too quickly increase the amount off water and obviously decrease if you see it take 3+ days. For soilless grows or hydroponic get it between 5.5-6.5 pH.

Like all living things, cannabis plants need water to grow, but the frequency and amount of water they require will vary depending on their size, stage of growth, and grow medium. 

Generally, larger plants should be watered every 2-3 days in the early morning (or as soon as the lights turn on for indoor grows) to improve nutrient absorption and reduce the chance of mold. Remember that the frequency of a watering schedule will vary by grow medium and environmental conditions. A good rule of thumb to determine if your plant is ready to be watered, put your finger in the soil up to your first knuckle (around 5 cm). If the soil is dry, it’s time to water. If the soil is still wet, hold off for another day or two.

How often should you water cannabis plants?

Observe the following if you think they need watering:

  • How does the soil feel?
  • Are they vibrant, rigid and strong?
  • Do the leaves look dark green or are they yellowing?

A mistake first time growers make is overwatering the plant, when first starting the process as a beginner all you want to do is give to the plant as much as possible. Over watering can be spotted if plants start drooping, usually the droopy leaves will feel firm and appear curled down. Overwatering does not always mean you’ve been giving the plant too much water. It can also mean that you’ve been giving the plant water too often.

Overwatered Marijuana Plants

  • Drooping / Curling is the first sign of overwaterd marijuana plants
  • Plants start drooping soon after watering
  • Leaves are firm and curled down all the way from the stem to the leaf
  • Will eventually lead to leaf yellowing and other signs of nutrient problems if not corrected

How to fix Overwatering

To fix this issue you have to give the plants more time between waterings, and then slowly build back up your watering schedule but don’t rush it. Make sure your pots are able to drain easy otherwise that could lead on to another problem itself like mold for example, check out my potting up blog for more about that.

Importance off Vegetative stage


This phase is a crucial period in the cannabis growth cycle. Allowing your plants to have a nice grow room temperature and humidity with a nice source off water and nutrients and 18+ hours off light will provide the plants with enough recourses to grow as large and healthy as possible. The bigger these females stretch the more nodes and bud sites will develop.

Within this stage it is much easier to get away or resolve any issues that occur whether that’s over feeding or your plants burning even tho it may stem your growth or decrease your final yield you can save these issues.

When your cannabis plant gets to a point where it has a stable root system and the environment is set up properly, it should just be a matter of upkeep to make sure you end up with a good yield. The plant will continue to grow and develop given proper nutrients and light, developing a strong structure necessary for the flowering phase.


Whilst being in vegetative stage make sure you let your plants get the most out off this stage as its essentially building the basics off your grow, the aim is to create a strong canopy that will later transform into a room full off buds. There is tons off people out there that rush this stage as they just want there buds to start coming out and want the whole stage to be as quick as possible not realising how much off an effect it has on your plants and the total outcome.

If you are using Sea Off Green for example that’s understandable, that consists off allowing your plants to be in Vegetative stage up to 2 weeks before flipping to flowering, for more on that check out my training blog it explains that method and other training methods available to increase yield and quality off the plant. Other then that not allowing your plants to get the most out off the Vegetative stage will not give you the yield that you want, most people do this as growing weed is a long process and you need a lot off patience to do so, especially if you are planning on growing strains with vegetative times off around 9-10 weeks. Giving your plants that extra couple off weeks in this stage will really show once it comes to flowering and when it is all over and you finally get to cut them down you will then be happy and relieved you left them that extra bit longer as your yield will be as expected.

There is it everything you need to know to master the Vegetative stage. Sign up to our newsletter for future blog blogs.

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