Marijuana plants, just like every other plant, need nutrients and timing is everything. During the vegetative stage, use nutrients with a high level of nitrogen, phosphorus, and potassium (N, P, and K). A ratio of 3:1:2 of NPK is ideal.
1 – Add the Correct Nutrients at the Right Time
Your marijuana plants require CO2 for photosynthesis. More is better as far as carbon dioxide is concerned because an increased amount boosts growth. It is also essential to add extra CO2 when increasing the intensity of the lighting. For reference, the air we breathe contains 350-400 parts per million (ppm) of carbon dioxide. Your plants use the CO2 and combine it with light to create the sugars that are pivotal to their growth.
4 – Lighting
During the flowering stage, switch your focus to phosphorus. Aim for an NPK ratio of 1:3:1. A good option here is to mix wood ash with water as it contains a high phosphorus content.
If you are starting with seeds, you will need to germinate them first, before they can begin growing. Whether you germinate them in something like a rapid rooter, on a paper towel, or directly in soil, it generally takes a day or two for the tap root to emerge from the seed.
The strain of marijuana you grow has the largest impact on how long it will take. If you choose a fast-growing strain, you can speed up the process considerably.
You’ll notice many of them are autoflower strains. Autoflowers are always a good choice, if you are looking to reduce the overall time it takes to grow your weed. They start budding much faster.
But that is just an average. The time it takes for weed to grow varies greatly. As mentioned, it depends on a number of factors and can range from 8 weeks to well over half a year.
Minimize Vegging Time
The amount of time it takes to grow cannabis can vary greatly, but there are things you can do to speed it up. Some, like shortening the vegging time, will have negative effects on yield, so you should always weigh the options carefully.