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Certain cannabis strains only show their true colors when you set the night time temperature a few degrees cooler than the daytime temperature; especially as harvest time approaches. Not every strain reacts well to colder night temperatures, while strains like Panama will become colorful regardless of the temperature. Then there are strains like Querkle that prefer it to be warm during the day.

To cover all bases, look to grow your weed in a temperature range of 75-80 degrees Fahrenheit during the day and 65-70 degrees at night. In general, marijuana with red, blue, and purple hues react well to slight drops in temperature. Be careful not to reduce it too much because your plants could go into shock. The photoperiod plays a significant role in a plant’s color. By reducing the number of hours that your crop is exposed to light, you could see a change in leaf color. This process becomes more intense during the blooming phase in what is known as senescence, which leads to a halt in chlorophyll production. At this point, all of a plant’s resources are used to ripen the flowers which cause leaves to die. Expert growers believe that pH is one of the most important changes you can make to bring out a marijuana strain’s color.

As a rule of thumb, soil should have a pH of between 6.0 and 7.0, while hydroponically grown weed performs well in a pH range of 5.5 – 6.5. If you want red and pink colors, keep the pH range acidic, which means on the lower end of the ranges above. Yellow and blue colors tend to appear in alkaline, or high pH, conditions. While the importance of light levels varies depending on the strain, weed from the ‘purple’ camp prefers strong direct light on the leaves and buds. It is believed that experimenting with the light spectrum in LEDs can work wonders for increasing the rate of anthocyanin production in your plant’s tissues. It seems as if the molecules act as a ‘sunscreen’ for the plant, so if you increase the light and create stress, the plant will react by upping its anthocyanin production. Experienced growers know how to stress the plant just enough to produce the equivalent of a suntan for their weed! Nitrogen deficiency can result in a chlorophyll decrease, which turns the leaves yellow. A phosphorus deficiency could provide a darker green color with hints of purple or red in the buds. However, we don’t recommend this tactic because it could severely damage your precious plants if extreme caution is not taken. Sunny and Bright Yellows and Oranges: Ideal Strains. Carotenoids are the compounds responsible for the bright and cheery yellows and oranges (and reds) you see in plants. In actual fact, humans also rely on carotenoids because they play a role in the production of Vitamin A, which we need for better growth and vision. While all green plants synthesize these compounds, they are often covered by chlorophyll production. It is only in the latter stage of growth when chlorophyll production is reduced that you’ll see the colors of carotenoids. Your best bet is to boost the pH level of your plants as they approach the last few weeks of flowering. Add organic soil amendments such as worm castings to your compost, but test its pH before adding it to the soil. Pink Flower Shaman, Pink Lady Kush, Pink Lemonade and Alaskan Thunder Bolt. It isn’t easy to find strains with red/pink buds, and you’ll have to do a little research and legwork. However, there are several with red or pink leaves or hairs. The reddish hues are due to specific phenotypes that genetically predispose the strain to produce the color red during the flowering stage. Drop the temperature and reduce the level of light received by plants during the flowering stage. It may also help to cut down on the level of phosphorus in the last few weeks before harvest. Don’t do it too soon or else you’ll deprive your plants of a vital nutrient. Those with genetic lineages from Vietnamese landraces; Vietnamese Black, Black Tuna , Black Willy, Black Mamba , Black Diesel, and Black Widow . It is necessary to drop nighttime temperatures down to the 50-degree mark.

This is a risky proposition because you could cause severe shock. Don’t expect to see any dark shades until the middle of the flowering stage. If the temperature is higher than the required level, some of these strains will provide a gold or red hue instead of the black you may see.

You need to take a risk with temperatures and choose the right strains to end up with dark-colored weed. There is a misconception that certain colors result in stronger marijuana strains. In rare cases, a strain will develop extremely dark genetics that makes the weed seem black. These are genetically pure strains that have not been meddled with. As a result, these strains are naturally potent and provide a major psychedelic high.

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