Giving marijuana plants too much water will kill them. You only need to water when the top 2-3" of soil becomes dry. If you choose to grow through hydroponics, you will likely never over-water your plants due to how well rockwool drains. So long as your rockwool cubes aren't submerged in water, you will not realistically over-water your plants. This includes both the drip method of hydroponics and the flood then drain method.
2. Being too talkitive
We recommend you do not tell anyone-especially because you will only make them jealous. Keeping this information to yourself is the best route to avoid the wrong person finding out.
3. Keeping your hands off!
Marijuana plant growers need patience. It can take up to ten days to sprout cannabis seeds. If possible, use a growing medium instead of paper towels to germinate seeds because of the touching required with paper towels. Proper marijuana germination
4. Using seeded marijuana for new marijuana plants
This is a common grower disappointment. Remember how much genetics play into what your final product becomes. It is far more important to buy good seeds than to use the perfect environment. Most marijuana seeds will create hermaphroditic plants with many late-flowering females and early-flowering males. Otherwise this would mean that the grower had an unusually late-flowering male plant that the marijuana plant grower overlooked. If you are trying to avoid this outcome, buy reputable marijuana seeds from legitimate seedbanks.
This is easy to do because not everyone keeps accurate notes as to when fertilization occurred. Once you have two spiked leaves coming out of the seedling, follow what your fertilizer bottle says. DO NOT USE FERTILIZER WITH EVERY WATERING! Begin with a 25% dilution rate and slowly increase the fertilizer. Use organic fertilizers when possible because it burns better and has better flavor. Leaves that fold or twist need watering with pure, fresh water.
While this does not happen as often, it still does happen. If you prefer using "just enough" fertilizer, then make sure you are using organics to optimize what your plants receive. Blood meal, bone meal and slow-releasing fertilizers will help your plants get the proper nutrients.
7. Avoiding cloned marijuana plants
Begin your new plants from marijuana seeds. You do not want to go through the pains that bugs or diseases will cause to your marijuana plants. Growers have grown marijuana plants indoors for many years without any pest problems. Now, if you think about where a cutting may come from, you have to include the potential problems and sprays that the other grower has been using, which will change the final product you get and how that product tastes.
8. Know when your plants should be started-indoors and out!
This is true for many reasons. If you plant to grow outdoors, you want to aim for June 1st. Many people think if they start their plants outside earlier that they will be rewarded with bigger buds from their marijuana plants, but this is typically incorrect. If you start your marijuana plants in the early parts of spring, you will end up with large plants that take quite a bit longer to flower. The best vegetative period is when sunlight lasts longer than the darkness. Then when the times start to balance out is when the plant realizes it is time to flower. If the plant is started earlier, it still has to wait for balancing of light and dark to start flowering. The sunlight having gone down some is going to create thinner plants instead of the bushier and fuller plants and buds that would have come from a plant that was started earlier.
On the other hand, marijuana plants that went outside later would grow like crazy due to the strong sunlight that comes during the heat of summer. This would leave you with heavy plants that give you a better end result than ones started early in the year. Indoor plants have the same issues but for differing reasons. With indoor marijuana plants, lights stay more shallow on the plants and stunt the growth, making the marijuana grower wait longer for a smaller yield.
9. Negative environments can harm marijuana plants
Proper air circulation is a must for healthy marijuana plants, no matter if you are leaving light on for 24 hours a day or doing 12 hours of direct light and 12 hours without any light. The air should be replaced around all of your marijuana plants at most every ten minutes. The ideal humidity is between 30 and 70%, and the ideal temperature ranges are between 75°F and 85°F | 24°C and 29°C. Seedlings also require wind or a fan to help strengthen the plant's stems.
10. Early harvests
We understand your temptation of wanting to harvest your beautiful buds and leaves as soon as you see it all coming together, but if you wait, you will be rewarded. The last 25% of weight gains for your crop will occur over the last two weeks before harvesting should occur. You want your marijuana plants to be completely done growing and your pistils to have gone from all white to 50-75% brown before you harvest your crop.