Temperature and Humidity
The ideal temperature for the light hours is 68 to 78 degrees Fahrenheit and for the dark hours there should be about
a 15-degree drop in temperature. The growing room should be relatively dry if possible. What you want is a resinous
coating on the leaves and to get the plant to do this, you must convince it that it needs the resinous coating on its
leaves to protect itself from drying out. In an extremely humid room, the plants develop wide leaves and do not
produce as much resin. You must take care not to let the temperature in a dry room become too hot, however, since
the plant cannot assimilate water fast enough through its roots and its foliage will begin to brown out.
Proper ventilation in your growing room is fairly important. The more plants you have in one room, the more
important good ventilation becomes. Plants breathe through their leaves. The also rid themselves of poisons through
their leaves. If proper ventilation is not maintained, the pores of the leaves will become clogged and the leaves will
die. If there is a free movement of air, the poisons can evaporate off the leaves and the plant can breathe and remain
In a small closet where there are only a few plants you can probably create enough air circulation just by opening the
door to look at them. Although it is possible to grow healthy looking plants in poorly ventilated rooms, they would
be larger and healthier if they had a fresh supply of air coming in. If you spend a lot of time in your growing room,
your plants will grow better because they will be using the carbon dioxide that you are exhaling around them. It is
sometimes quite difficult to get a fresh supply of air in to your growing room because your room is usually hidden
away in a secret corner of your house, possibly in the attic or basement. In this case, a fan will create some
movement of air. It will also stimulate your plants into growing a healthier and sturdier stalk. Often times in an
indoor environment, the stems of plants fail to become rigid because they don’t have to cope with elements of wind
and rain. To a degree, though, this is an advantage because the plant puts most of its energy into producing leaves
and resin instead of stems.
Dehumidifying Your Growing Room
Cannabis that grows in a hot, dry climate will have narrower leaves than cannabis grown in a humid atmosphere.
The reason is that in a dry atmosphere the plants can respire easier because the moisture on the leaves evaporates
faster. In a humid atmosphere, the moisture cannot evaporate as fast. Consequently, the leaves have to be broader
with more surface area in order to expel the wastes that the plant put out. Since the broad leaves produce less resin
per leaf than the narrow there will be more resin in an ounce of narrow leaves than in one ounce of broad leaves.
There may be more leaf mass in the broader leafed plants, but most people are growing their own for quality rather
Since the resin in the marijuana plant serves the purpose of keeping the leaves from drying out, there is more apt to
be a lot of resin produced in a dry room than in a humid one. In the Sears catalog, dehumidifiers cost around
$100.00 and are therefore a bit impractical for the “hobby grower.”