We have exposed kratom plants to wintertime temperatures as low as 50 degrees. But as temperatures dropped into the 50’s, we had leaves that turned red in color and eventually dropped off. In our test, the kratom plants remained under these conditions for weeks before the leaves totally dropped. However, in some cases, dropped leaves may still be capable of growing back once temperatures rise again. On the other end of the thermometer, it has been suggested that growth slows significantly if kratom plants are exposed to temperatures above 90 degrees Fahrenheit. But we have experienced good growth even with steady temperatures as high as 96 degrees.
Another condition that kratom requires is high humidity. The average humidity of Bangkok, Thailand tends to be between 90% and 94% during the morning. But it can range between 53% and 70% in the pm hours depending on the time of year. This suggests that kratom has at least some natural exposure to medium range humidity. While you do not want your kratom plants to be in a dry environment, you can easily create suitable humidity without exhausting yourself. Humidifiers can be used to give your kratom plants a humidity boost, but they are expensive to buy and run. Plus, these devices use up unnecessary energy. Instead, there are other options for giving your kratom plants the proper humidity.
Since external humidity tends to fluctuate and may not reach 90%, even at a high point, it is best to keep your kratom plants in some type of contained environment. It is easier to control humidity in a container. For example, small kratom plants can easily be kept in a fish tank terrarium with a light placed directly overhead. Continual pruning will be needed to maintain size, but your kratom plants will probably be very happy inside. You can spray the sides of the terrarium every so often or even fill the bottom with an inch or two of moist perlite if you want to add additional humidity. We do not recommend direct misting as a substitute for true humidity because it is only a temporary solution and does not provide the same type of humidity as evaporated moisture. If you have a grow closet with a lot of plants, it is likely that there will be enough moisture in the air simply due to evaporation from the soil. But if ventilation or other factors keeps the air drier, adding an aluminum roasting tray of moist perlite to the vicinity will work in this case too. The idea is not to become overly focused on temporary humidity fluctuations but to try to maintain a high average humidity and pay attention to the visual clues.
Aside from humidity, temperature is rather important when it comes to growing kratom. The ideal temperature for growing kratom is between 75 and 90 degrees Fahrenheit. However, most households tend to keep temperatures around 68 degrees. This would be considered similar to low wintertime temperatures in Thailand, but we have found that kratom plants will still grow decently in this range. So you do not need to live in a tropical climate or roast yourself out of your house to grow kratom. Artificial lights will also add as much as 20 degrees depending on ventilation and the type of lighting. So you can easily maintain ideal temperatures in an average household. Anything below 65 degrees Fahrenheit, though, would start to noticeably slow your kratom’s growth.
When it comes to light, it might seem that you need a High Pressure Sodium system to grow kratom because kratom loves light. Kratom does seem to greatly enjoy that type of light and will grow nice under such intensity. If you’re looking to pamper your kratom plants, HPS or LED is certainly the way to go. But kratom also will grow very well if placed directly under fluorescent lighting, which is much cheaper to run and can be set up with significantly less cost and effort. Even a single 18 watt (120 volt) compact fluorescent bulb has been proven to work for growing small kratom plants without the plants suffering any maladies. We have also found that a 100 watt (120 volt) full spectrum halogen bulb can support one or more kratom plants. A 24-hour light cycle will work if you do not mind the extra electricity consumption. With that said, it seems that more light will in fact produce darker kratom leaves with redder veins, and this is likely where the emphasis on heavy lighting comes in. Kratom vendors seem to identify various strains of kratom by the redness of their veins. But, in fact, a kratom plant with very red veins can change to have purely green veins depending on the conditions. We suspect that this phenomenon is similar to human skin tanning under more sun exposure.
You can use the leaf texture to determine when adjustments are needed before dropping takes place. If you can get your humidity to up around 90%, your kratom plants will probably never complain. But judging from the climate of Bangkok and our personal experience, you do not have to be alarmed if you see fluctuations in your humidity. It’s normal for humidity to fluctuate even within a self-contained growing environment, especially as temperatures fluctuate and cause more or less water to evaporate. But it should be easy enough to keep your average humidity up to a suitable 70, even where your external humidity is lower.
It seems that some people make growing kratom seem harder than it really is. But don’t be scared off from getting one of these wonderful plants because the truth is that kratom is rather easy to grow and will put on growth rapidly compared to a lot of other plants. Some guides have made it seem like if you do not have an expensive lighting system or a special soil, your kratom plants are doomed. Well, we’ve had a bit of experience with growing kratom indoors over the years, in all sorts of environments, and we’ve come to realize that a lot of that information leads to a lot of unnecessary worrying.
Kratom leaves are waxy, and so they hold onto moisture more easily than say salvia leaves. This seems to provide a bit more room for error when it comes to a short-term humidity drop killing a kratom leaf. You tend to have some extra time to notice visual clues that your kratom plant could use more humidity. A higher humidity will produce much nicer kratom leaves with more of the characteristic glossy shine whereas kratom leaves in lower humidity tend to be more roughly textured and perhaps a little discolored. Kratom also has a tendency to drop leaves when it is really unhappy.
At least one popular kratom guide suggests that commercial soils are unfit for growing kratom plants. But we have had nothing but success by growing kratom using plain Miracle Grow potting soil, a tip we saw being recommended in another guide and decided to test ourselves. We’ve also had similar success using our own soil mixtures to grow kratom. We’ve found that mixtures that are fertile and well-draining will generally work. But we have experienced firsthand how proper soil ph is also essential to growing kratom. It has been suggested that the ideal ph for growing kratom is between 5.5 and 6.5. Without the proper ph, kratom will not be able to take up the proper nutrients from the soil, and it will exhibit signs of nutrient deficiency. In one soil mixture, we used compost that proved to be on the alkaline side. This caused a sudden change of yellow, blotchy leaves on the affected kratom plants. After adding some sulphur to acidify the soil, it corrected the problem.
World Seed Cultivation Database Tuesday, September 28, 2010 Growing Kratom Indoors: How to Grow the Easy Way It seems that some people make growing kratom seem harder than it really is.