Robert Bergman is an Amsterdam-based marijuana grow expert who has years of experience from small grows to massive operations. Now, Robert is dedicated to sharing his knowledge with the world.
Marijuana Grow Course
Although most people who cultivate outdoors grow in soil, it’s also possible to grow on hydro. In this course I will show you how to build an easy hydro system for outside. Also, I will keep up with a grow journal this summer and post an update every week
Marijuana Grow Course
Osmosis is an important process for a marijuana plant. It keeps tension on the cells, thereby making the plant stand upright. Osmosis furthermore puts the leaves in the right position and the buds in optimal condition. It is also an important process for the absorption of nutrients. Osmosis is a
Marijuana Grow Course
Just like humans, a marijuana plant has to breathe: take in oxygen from the air. This is used in the respiration that converts sugars and oxygen into energy, water and CO2. The energy keeps the plant alive. It is used for instance to create proteins, to pump substances into and
Marijuana Grow Course
It is essential for every marijuana grower to have a good understanding of the process of photosynthesis, because it’s the basis of all growth. If something goes wrong with photosynthesis, other processes inside the plant will also not function optimally. This is because a plant creates its own food
Marijuana Grow Course
Cells are the smallest, independent building blocks of all living creatures. Marijuana plants also are made up of cells. All cultivation operations, such as fertilizing and pruning, affect the cellular level. Changes in the climate, such as an increase in temperature, also influence the cells and the processes that take
Marijuana Grow Course
This symptom checker will help you to quickly identify marijuana plant problems and easily diagnose sick marijuana plants! Learn more about nutrients, diseases, stresses, pests and bugs. Click on any picture for detailed information about a particular marijuana problem, deficiency or symptom and find out what’s wrong with your
Marijuana Grow Course
You only see half of a plant when you see it in nature. The underground part – the roots – is at least as big as the part above the ground. Then why do plants that grow indoors in soil or on rockwool have such a tiny root volume? That’s because
Marijuana Grow Course
Carbon dioxide is very important to a plant. A high concentration of CO2 in the air makes a faster growth possible. It’s vital that your grow room contains a lot of CO2, so the plants can keep growing properly. Luckily, CO2 is present in regular air. But since your
Marijuana Grow Course
In nature, wind is a very important factor for the reproduction of plants. It carries the pollen from the males to the pistils of the female for fertilization. The wind also helps to spread the seeds. After rainfall, the wind will blow the plants dry to protect them from fungi.
Marijuana Grow Course
It’s time to harvest these marijuana plants. More than 70% of the hairs are brown, and I think this is a great moment to harvest white widows. You can see that the main bud doesn’t seem fully ripened, but that’s because it keeps producing pistils. You should
Marijuana Grow Course
Humidity is the amount of water vapor in the air, expressed in percentages. Humidity is very important to marijuana plants, because it determines the degree of evaporation. The lower the humidity, the higher the vapor pressure, so the more water and nutrients your marijuana plant can absorb. But if the
Marijuana Grow Course
There are different ways to determine whether your marijuana is ready to be harvested. One is more accurate than the other. The moment of harvesting partly determines the taste, scent and the effect of the cannabis. You can compare it to wine; the later a grape is harvested, the more