Help your plants with simple humidity controls

The simple things make a big difference!

Humidity is something a lot of people don’t pay attention to. Clever management of the humidity in your grow room can help your plants throughout their life cycle. Stupid management and you can hinder them.

Humidity plays such a huge part in the overall health and yield of your plant it wise to use it to your advantage.

Humidity an introduction:

Many growers have the mistaken belief that too much humidity is a bad thing. Whilst it’s true that high humidity can cause fungal and bacterial problems during the fruiting stages of your plants it can be a boon to them during the all important vegetative stage. Careful management of the relative humidity can result in better, bigger & quicker growth.

What’s the ideal humidity for my grow room?

Humidity and temperature are linked. The ideal humidity for your grow room depends on the ideal temperature your plants require to grow & which stage of growth they are on. Here is a quick sample of the ideal relative humidity for your grow tent.

Temperature

15 Degrees Celsius
16 Degrees Celcius
17 Degrees Celcius
18 Degrees Celcius
19 Degrees Celcius
20 Degrees Celcius
21 Degrees Celcius
22 Degrees Celcius
23 Degrees Celcius
24 Degrees Celcius
25 Degrees Celcius
26 Degrees Celcius
27 Degrees Celcius
28 Degrees Celcius
29 Degrees Celcius
30 Degrees Celcius
31 Degrees Celcius
32 Degrees Celcius
33 Degrees Celcius
34 Degrees Celcius

Optimum Humidity Range

40-55%
45-55%
50-60%
50-60%
55-65%
60-65%
60-65%
60-70%
65-70%
65-70%
70-75%
70-75%
75%
75-80%
75-80%
80%
80%
80%
80-85%
85%

Although the optimum humidity range can apply to most plants some will require careful tweaking as certain plants can react differently. For example the Calochortus plant require a dry warm environment to thrive.

Your plants will also react differently to humidity during different stages of growth, we have outlined the optimum humidity conditions for each stage below.

Seedlings & Cuttings

Temperature

22oC – 26oC
22oC – 26oC
22oC – 26oC
22oC – 26oC
22oC – 26oC
25oC – 29oC
25oC – 29oC
25oC – 29oC
25oC – 29oC
25oC – 29oC
28oC – 33oC

Relative Humidity

70%
71%
72%
73%
74%
75%
76%
77%
78%
79%
80%

Vegetative Stage

Temperature

15oC – 18oC
15oC – 18oC
15oC – 18oC
15oC – 18oC
15oC – 18oC
15oC – 19oC
17oC – 19oC
17oC – 19oC
17oC – 19oC
17oC – 19oC
17oC – 22oC
19oC – 22oC
19oC – 22oC
19oC – 22oC
19oC – 22oC
19oC – 24oC
22oC – 24oC
22oC – 24oC
22oC – 24oC
22oC – 24oC
22oC – 26oC
22oC – 26oC
22oC – 26oC
22oC – 26oC
22oC – 26oC
25oC – 29oC
25oC – 29oC
25oC – 29oC
25oC – 29oC
25oC – 29oC
28oC – 33oC

Relative Humidity

50%
51%
52%
53%
54%
55%
56%
57%
58%
59%
60%
61%
62%
63%
64%
65%
66%
67%
68%
69%
70%
71%
72%
73%
74%
75%
76%
77%
78%
79%
80%

Flowering Stages

Temperature

15oC
15oC
15oC
15oC
15oC
15oC – 16oC
15oC – 16oC
15oC – 16oC
15oC – 16oC
15oC – 16oC
15oC – 18oC
15oC – 18oC
15oC – 18oC
15oC – 18oC
15oC – 18oC
15oC – 19oC
17oC – 19oC
17oC – 19oC
17oC – 19oC
17oC – 19oC
17oC – 22oC

Relative Humidity

40%
41%
42%
43%
44%
45%
46%
47%
48%
49%
50%
51%
52%
53%
54%
55%
56%
57%
58%
59%
60%

How can I lower the humidity in my grow tent?

There are many simple methods to decrease humidity in your grow room.

  • Buy a dehumidifier from your local hardware store or supermarket
  • Increase ventilation with a better extractor fan
  • Avoid over watering your plants

How can I raise the humidity in my grow room?

There are many easy, cheap and fast ways to increase the humidity in your grow tent.

  • Put some water in a spray bottle and mist your plants each morning
  • Put a plate or large bowl of water under your light it will evaporate throughout the day
  • Buy a cheap humidifier from your local supermarket
  • Decrease ventilation, lower the power on your extractor fan

Will it really make a difference?

Management of humidity levels can make a vast improvement on your overall health and yield of the plants.

If you’re humidity levels are too high your plants can suffer from mould, rot and various other pathogens.

If your humidity levels are to low your plants could suffer white spots, lower nutrient uptake and stunted growth.

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