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Ideal Water Temperature? - Ask the Garden Sage
As a gardener, you know that the correct temperature is crucial for the growth and development of your plants. But what is the ideal water temperature for growing cannabis?
Cannabis thrives in temperatures between 70 and 85º F. However, the specific water temperature best for your plants will depend on your growing environment.
In this segment of Ask the Garden Sage, professional grower David Robinson explains what happens to the cannabis plant when exposed to different water temperatures.
Why Oxygen Matters
Oxygen is an essential element for all living things, and plants are no exception. When watering plants, it is vital to ensure that the water is oxygenated, as this will help the plants absorb the water and nutrients more effectively.
Plants watered with oxygen-deprived water may struggle to absorb the necessary nutrients, leading to stunted growth and potential health issues.
The amount of oxygen in water depends on many factors, including atmospheric pressure, water temperature, and water salinity.
You can use an aeration stone to oxygenate the water for your hydroponic garden. This will allow the water to become saturated with oxygen, which will benefit your plants' health and growth.
Warm Water, Low Oxygen
“If the water is too warm, being over 70-72º F, the oxygen content of that water will be quite low. Low oxygen can eventually lead to an anaerobic environment in the root zone, opening the door to disease, specifically Pythium root disease,” warned the Garden Sage.
Some signs that your plant may suffer from Pythium root rot include yellowing or wilting leaves, reduced growth and vigor, and a foul smell emanating from the roots. The roots may also appear dark and mushy, and the plant may be more susceptible to other diseases and pests.
Cool Water, High Oxygen
“Colder water that is higher in oxygen will be more beneficial to our plants. Most of the time, 65º-67º F are considered ideal numbers,” suggested the Garden Sage.
However, maintaining this optimal temperature range in water can be challenging since grow room temperatures are between 72º-77º F for vegetative plants and 75º F for flowering plants or between 82º-84º F if using supplemental carbon dioxide during the vegetative stage.
Keep your water temperature in the ideal range by adding hot or cold water as needed, using cooling devices or bottles filled with ice, or keeping water in a cool area.
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