Posted on

ideal temperature for growing marijuana

A grow room might be as small as a closet or as big as a barn. No matter the size of your grow room setup, you want to pamper your plants for maximum growth and strength.

Water is a crucial element of life, and pot plants are no exception. They need adequate amounts to thrive. Growing plants inside, you will need to provide a steady supply of just the right amount of H2O. You could hand-water with a hose or a bucket, but that is a time-consuming and inefficient process. A good drip irrigation system can deliver just the right amount of water to each of your plants efficiently and reliably.

Grow Room Tips for Cannabis Growing

Just like people, plants do their best in a particular temperature range. Generally, pot plants in their vegetative stage prefer a temperature in a range from about 68 to about 77 degrees Fahrenheit. When they are flowering, cannabis plants like a range of about 65 to 85 degrees Fahrenheit. They can live in lower and higher temperature, but since you can control the heat simply indoors, why not give them what they want for maximum growth and potency?

Watering Cannabis

You will also want to be sure to provide your plants just the right amount of fertilizer. Many commercial fertilizers specifically formulated for cannabis are on the market. You can also mix your own with fertilizers high in nitrogen, phosphorus and potassium. If you do have a drip system set up, fertilizer injectors will help you as well.

Ideal temperature for growing marijuana

Too Cold: What To Do

Too-cold air can cause buds to grow airy and loose

CFL grow lights can be purchased from the grocery store and can be kept mere inches from your plants, so they are great for growing in very short/tight spaces where ultimate stealth is the biggest goal.

Seedling & Vegetative Stage

7 Essential Concepts About Temperature Control

More About the Upper Limits of Temperature

It’s good to aim for a temperature of 70-85°F (20-30°C), during the vegetative stage. It’s not always possible, but try to give plants slightly cooler temps during the dark period than during the light period as long as you stay within the recommended range.

Both hot and cold in your grow room? For those who struggle with both hot and cold temps where you live, you may want to consider getting an All-in-One Heater & Air Conditioner.

Temperature & Humidity Adjustment Cheat Sheet

But it’s not necessarily that easy. The quest to find the perfect thermometer/humidity monitor can be tough.

Too High (Hot) Temps

Ideal temperature for growing marijuana

Seed Coupon Included

You can also fix a heat problem by situating the lights a little bit further from the plants. You can also use cooler lights. Air or water-cooled grow lights can protect the plants from heat, despite the light intensity. If using regular grow lights, keep them at least three feet away from your plants. Air or water-cooled lights can be placed as close as a foot away from your plants.

When you choose to water your plants can also help with absorption and prevent heat problems. To help keep your plants hydrated, water in the early morning before the sunrise and late in the evening after sunset. When you water at these times, your plants are better able to absorb more of their water because it does not evaporate as quickly.

Soil temperature and marijuana plants

When the marijuana grow room temperature is above 85 degrees Fahrenheit, photosynthesis will be affected; however, the plant will still produce sugar. For the sugars to be distributed throughout the plant, the plant temperature should be above 20ºC or 60ºF. In the case of sugars, heat is a good thing. If the plant is not warm enough, the sugars will be stuck, and the plant will suffer. Once the plant is warm enough, the sugars will be distributed to their respective places.

Harvest up to a pound

Fixing and preventing marijuana heat problems

During the flowering stage, however, the ideal temperature to grow marijuana plants can be a little colder. The temperature should be kept between 65-80 degrees Fahrenheit (18-26ºC). The second half of the flowering stage is when the temperature should be at its coolest. This helps your marijuana plants produce flowers with rich color, as well as increased trichomes, denser buds, and more potent smell.

In general, a sign of heat stress in marijuana plants are curling leaves. Here are some other signs to look out for: