If, in addition to a low cultivation temperature, the growing medium is over-irrigated or water-logged, then the plant will be completely unable to take up magnesium, leading to visible deficiencies in the larger leaves, which even the application of magnesium in every watering will be unable to solve.Īs we can see, controlling the temperature of our grow is integral to a successful cannabis harvest and there are various options available to help us do this, adaptable to each grower's needs based on dimensions, ambient temperature, lights used etc. Healthy cannabis plants in flower, protected from low temperatures This micro-nutrient is vital for the proper development of the cannabis plant and if the substrate is colder than 18✬ then this element is most likely not being absorbed by the plant. This will have an obvious negative impact on yields, leading to very small buds and vastly reduced production.Īs previously mentioned, low temperatures will detrimentally affect the root system and the uptake of nutrients, particularly in the case of magnesium. The root system cannot function as it should, rendering it unable to absorb adequate nutrition. The bio-chemical and enzymatic processes required for healthy growth cannot take place and vegetative vigour disappears leaving plants small and weak. As with water, which at higher temperature contains a lower concentration of dissolved oxygen, once the air cools to below 18-20✬ the plant's metabolism will slow down gradually and hinder or halt development.Ĭannabis plant battling tough winter conditionsĪs the plant's metabolism slows down everything becomes much less active. How does the cold affect cannabis plants?Ĭannabis varieties react differently to cold, although below a median temperature of 12✬ they are universally at risk of death. An easy way of avoiding this issue is to install a temperature controller, a device that allows us to regulate the air intake and keep the ambient temperature well within the optimal parameters, thus averting any difficulties caused by excessive variations in temperature. When the lights are working, this works very well to counter-act the heat produced and cool the grow space to the ideal daytime temperature of 24-26✬ however, at night when the lights are switched off and it gets cold outside we can encounter problems as temperatures inside fall well below the comfortable night time level of 20-22✬. Possible problems can arise indoors during winter if the air intake to the grow room is drawing directly from the exterior. Modern indoor technology allows us to completely control all the parameters - the hours of light, the ventilation, temperature, humidity, etc, and create the perfect environment to grow cannabis throughout the year. When growing indoors, these ad verse environmental conditions are not such an issue, we can easily recreate the optimal atmospheric conditions needed for healthy plant growth within a small indoor garden, whether a grow tent or a small grow room. The plants native to these areas are known as Indica or WLD (Wide Leaf Drug) varieties and they are well equipped to deal with wide variations in climactic conditions affecting temperature, humidity and also the effect of the changing photoperiod on plant morphology and life cycle. As we move further away from the equator, to countries such as Pakistan, Lebanon, Afghanistan, India, Russia, China etc, weather conditions become more diverse, with clearly defined seasons and as a result, the period in which it is possible to cultivate cannabis is shortened according to latitude. In countries closer to the tropics where cold weather is rarely experienced, it’s possible to cultivate cannabis throughout the whole year, and the Sativa or NLD (Narrow Leaf Drug) varieties that are native to this tropical region are adapted to cope with a relatively stable climate without great variations in temperature or photoperiod. Across the different regions where these plants are found, there are significant environmental and geographical differences in altitude, latitude, temperatures, humidity, photoperiod, etc. As a result, we can find a great diversity of cannabis genetics worldwide. The cold and it's effect on flavour and colourĬannabis as a plant species grows wild in many places of our planet Earth.Taking advantage of the cold in cannabis growing.How does the cold affect cannabis plants?.
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