There are many issues that may arise during your cannabis cultivation experiences. Growing indoors helps to alleviate some of the common problems, like pests, bugs, and environmental inconsistencies. By creating a clean and enclosed space, such as a tent kept in a spare room, growers are able to control the externalities that could possibly damage their plants. For our grow room, we have 2 tents with filtered fans for air circulation. To see a list of what we used to set up our hydro-system, please refer back to my older post, http://bit.ly/HomeHydroSystem.
Above are some pictures of an issue that our plants in our smaller tent are currently experiencing. There are many places online that explain common issues as well as books such as The Cannabis Encyclopedia by Jorge Cervantes, a great book if you wish to learn all aspects of the cannabis plant and its cultivation processes. My favorite online site to visit when looking up issues that I've personally encountered over the last 5 months is hosted by Robert Bergman, with excerpts from his book, Marijuana Grow Bible, which can be visited at http://www.ilovegrowingmarijuana.com/identify-marijuana-plant-problems/.
Common issues include nutrient deficiencies or excess, improper water PH and temperature levels, light burn, root rot, and wind burn. I'm not a professional, and there are many things that can go wrong during cultivation, so the above resources, and many others like it, are there for us to use as guidance.
Today we've come across 2 issues. First, our plants in the smaller tent have burning displayed on many of their newer fan leaves, as well as browning along their veins and yellow sporadic specks. Due to the location of the problem, we have theorized that this is an immobile nutrient issue, and by the looks of it one of excess potassium, which has caused a calcium deficiency. We treated our plants with fresh nutrient water and hopefully corrected this nutritional imbalance by decreasing the amount of FloraGro and increasing the amount of Cal-Mag we added to our water. I also trimmed away some of the worse leave so that I can more easily see if the issue continues with the new growth. Do you think we made the right call? Or do you think this could be a different issue, based on the photos above?
Next, we found many leaves in the big tent were curling. Pictures of curling leaves are noted as either being heat related or a sign of a severe infestation of hemp russet mites. However, since those mites cannot be seen with the naked eye and since we don't own a magnifier, we are treating the plant for heat issues. The temperature has warmed up a bit, so the outside air we have cooling down the room isn't as cool as it was before. The big tent was sitting at 79 degrees Fahrenheit, so we increased the current airflow and added an extra fan to circulate air inside the tent. This will either spread the mites to the rest of the plants (crossing fingers that this is NOT the case) or our plants should cool off and stop showing these signs of heat stress. I also rose our lights since only the top fan leaves closets to the light were curling. Have you read of something else it might be? Have you ever had to deal with pests in your indoor garden?
The last issue that came to our attention, actually as we were reviewing these other issues, was that the plant with most of the curling leaves and the other Purple Trainwreck next to her are both showing a purple-reddish color in their stems. Online and books agree that this is either genetic or could be signs of a phosphorous deficiency. Since the two plants showing these color characteristics are purple strains, we are going to not take any brash actions for now and keep an eye out for any other signs that this could be anything other than a genetic coloration.
We've encountered various issues, like these, throughout our growing process. Usually, we treat the issues by changing their water with fresh water that's been treated with the proper nutrients to counteract any plant problems perceived. Once, when we encountered root rot in the early vegetation stage of our THC Bomb (pictured above), we cut off all its bad roots and let it start the process again. It may be a bit dwarfed compared to the other plants, but she has mostly recovered and is flowering. She is in the small tent, so she has also been experiencing the possible calcium deficiency issue discussed earlier. Hopefully these issues too shall pass.
Wishing everyone else pleasantly smooth cultivating!