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  The Steps
1. Overview

2. Genetics and the Cannabis  plant

3. In & outdoors - strategy

4. Planting Cannabis indoors

5. Shelf growing

6. Cannabis Lighting

7. Sea of green Method

8. Cannabis Germination 1

9. Germination 2

10. Vegetative growth

11. Cannabis Flowering

12. Hydroponics

13. Recycling

14. Planting Cannabis  outdoors

15. Guerrilla Growing

16. Soil growing

17. Security

18. Plant food and nutrients

19. Ph and fertilizers

20.  Feeding Foliage

21. Co2

22. Venting

23. Temperature

24. Pests

25. Transplanting

26. Male Or female

27. Regeneration

28. Pruning Cannabis

29. Harvesting and drying Cannabis

30. Cannabis Cloning

31. Cannabis Breeding

32. Sinsemillia

33. Sinse seeds

34. Odours and negative ions


35. Oxygen

36. Safety and privacy

37. Distilled water

38.  Cannabis Seeds and buds storage

39. Percentage of females

conclusion
 

 

 CANNABIS GROW ROOM TEMPERATURE

Proper temperature is one highly variable factor. Most books state optimum grow temperature to be 70-80 degrees, but many list extenuating circumstances that allow temperatures to go higher. Assuming genetics is not a factor, plants seem to be able to absorb more light at higher temps, perhaps up to 90 degrees. High light and CO2 levels could make this go as high as 95 degrees for increased growth speed.* An optimum of 95 degrees is new data that assumes very-high light, CO2 enrichment of 1500 ppm and good regular venting to keep humidity down. It is not clear if these temperature will reduce potency in flowers. It may be a good idea to reduce temperatures once flowering has started, to preserve potency, even if it does reduce growth speed. But higher temperatures will make plants grow vegetatively much faster, by exciting the plants metabolism, assuming the required levels of CO2 and light are available, and humidity is not allowed to get too high.

With normal levels of CO2, in a well vented space, 90 degrees would seem to be the absolute max, while 85 may be closer to optimum, even with a great deal of light available. Do not let the room temperature get over 35 C (95 F) as this hurts growth. Optimal temperature is 27-30 C (80-86 F) if you have strong light with no CO2 enrichment. Less than 21 C (70 F) is too cold for good growth.

Low temperatures at night are OK down to about 60 degrees outdoors, then start to effect the growth in a big way. Mid 50s will cause mild shock and 40s will kill your plants with repeated exposure. Keep your plants warm, especially the roots. Elevate pots if you think the ground is sucking the heat out of the roots. This is an issue if you have a slab or other type of cold floor.

As temperature goes up, so does the ability of the air to hold water, thus reducing humidity, so a higher average temperature should reduce risk of fungus.

Contrary to many reports, high humidity is not good for plants except during germination and rooting. Lower humidity levels help the plant transpire CO2 and reduce risk of molds during flowering.

Studies indicate the potency of buds goes down as the temperature goes up, so it is important to see that the plants do not get too hot during flowering cycles.

* D. Gold: CO2, Temperature and Humidity, 1991 Edited by E. Rosenthal.

 

 
 
 
 
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