temp

whats a good temp to keep the plants in flowering.. im growing with 250hps 2 plants in soil less potting mix. I had my plants in my garage and after it wile it seemed like they stoped growing and I think it was the heat it would get over 98 100 some times in there.

I've read that you keep the temp between 15c and 30c. Danger above 40c and can die below 5c. Hope it helps!

70 to 75 daytime. Nighttime depends on how long you want the space between stems (internodes). No more than a 10 deg difference between day and night. If you do 70 day and 70 night the stems will be close together. If you do 75day 65 night they will be far apart. Your water should be 60

right now the weather has been hella hot around my area. im growin hashberry's. the temps in my room are from 92-102f, but the HBs seems to be doing good with no stress

They would be doing a lot better at 75. The plants entire purpose is to survive, so it will make it BUT the purpose of growing indoors is to control the environment. The more the plant has to devote resources to surviving in high heat, the less resources it has to produce THC.

crickitmd said:

right now the weather has been hella hot around my area. im growin hashberry's. the temps in my room are from 92-102f, but the HBs seems to be doing good with no stress

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Wow that's hot my friend! Are you sure you are measuring properly? Although some strains will adapt to the heat better. But anyways...

Essentially there are two aspects to the thermal environment that you need to be aware of:

1. The AIR temperature
2. The RADIANT temperature

Although obviously related, these are 2 distinctly separate phenomena and your plants have different tolerances for each.

1. Air temperature
Your standard mercury/alcohol-bulb or digital thermometer is designed to measure the temperature of the air (But not radiant heat). This is what is being referred to in the usual growers 'rules of thumb' such as maintaining your grow above 16degC and below 30degC.

Most thermometers are only designed to measure air temperature – growers often mistakenly place their thermometer in direct light; radiant energy will warm your thermometer and give a higher than actual reading.

*Assuming your air is well mixed up by oscillating fans, it doesn’t really matter where you locate your thermometer. The best spot is probably about half the way up a wall, with a piece of cardboard over it (To shade it from radiant heat), exposed to the mixed air in the grow room.

2. Radiant temperature
Radiant temperature is the result of heat transfer bewteen objects at different temperatures without whats inbetween i.e. the air, being effected. In our case the plants are naturally at a lower temperature that the light and reflector so heat is transferred to the plants foliage from the light/refecltor through radiation. This causes the leaves to heat up. The plants can withstand much higher radiant temperatures (around 40-50degC) than they can air temperatures but if this is too high the plants can 'burn'.