Stress in marijuana plantsis caused by imbalances of the plant chemistry. Generally plant stress disrupts the normal chemical reactions happening within the plant and causes ethylene ( the aging hormone) to start developing in the cells.

A plant likes to have an average day with no surprises on any day of its life. Any unusual event in the marijuana plantslife will change its internal chemistry and result to slow growth. Some of the stress causes are

1) WATER STRESS: There is a lack of water or too much water for the plant to absorb. Water stress in marijuana plantscauses abscisic acid to build up and closes down the stomata.

2) NUTRIENT STRESS: Usually cased by too much, not enough, or an imbalance of the nutrients. This can attract diseases or nematodes (type of worm) and disrupt root function.

3) Mineral Stress: It is caused by mineral imbalance in plant tissues, usually due to nutrient problems or by adding to re-circulating mixes. This causes plant growth to slow. By the time the results are visible, the problem is already very advanced. It usually takes a week or so to recover from mineral stress.

4) PH STRESS: The PH of the nutrient solution is changing all the time as the plant uses the minerals in the surrounding nutrients and as the water is transpired by the leaves and evaporates from the nutrient solution. Wildly fluctuating PH will reduce the marijuana plantsnutrient uptake and cause deficiencies

5) AGE STRESS: AS a plant gets older, its nutrients need to change. A tissue analysis will show the plant using totally different quantities of each nutrient as it ages. In highly supercharged garden systems, the nutrient fed to marijuana plantsis different for each week of growth. Mature or ageing marijuana plantsneed far less nutrients.

6) IRREGULAR LIGHT CYCLES: These will change the hormonal balance in marijuana plantsthat use the length of light and dark to tell when to flower.

7) PLANT DAMAGE: Any damage causes the plant to change its chemistry to repair the damaged are of the plant

ROOT DAMAGE: Either physical or chemical causes the plant to divert its chemistry to keep the roots advancing and creating new root hairs to absorb food. Roots can’t actually rebuild themselves when damaged; they just seal off the damaged section and move around it.

9) Environmental extremes / Diseases: The can cause a plant to age and flow prematurely, a female plant to produce viable seeds without being fertilized, or just cause poor growth.

Another article will be written that explains parasites and insects

Our crop suffered from this a few times so i was wondring what is the best way to water the plants ?
We used a spray type method for watering the plants which kept the leaves moist and also the soil.

I Generally do not recomend spraying, the water intensifies the sun and will burn the leaves, just a regular old bucket and put the water in the pot. I usually water about 1 hr after the light turns off that way it does not get evaporated and the plant is able to use it more efficiatly.

If you are having problems when to water your precious weed plant buy one of those water level meters, costs $10 at walmart.

happy growing

How often should i turn my light on or off? and how long should it stay on or off?

It depends how old your plant is. early when its still a youngun it needs alot of light, but when its mature, u should change it up a bit. want specifics? check out How To Grow Marijuana-Newbie Central-Growing Marijuana, it covers lighting, soil, nutrients, harvesting, all of the basic things u need to know to have a happy plant.

18-6 is what i keep it at

__________________
BC bud baby!

my name is AK, Chronik is my play!!

Dopaloholic

AK How many watts is your light?

Hey Trynasmoke! I use T5 flourescent bulbs. I use a 4 ft. 4 bulb fixture for vegetative growth. 18 hrs on and 6hrs off.
For flowering I use a 1,000 watt HPS(high pressure sodium). 12 on and 12 off.
This is one way to grow the most beautiful ladies you've ever seen.

I'm stoned as hell again, but I don't get this? You water 1 hr AFTER the light goes off to avoid evaporation? Is evaporation really a bigger problem than mold? Unless you are A) really good in the dark or B) using a feeding system, how are you not breaking the dark cycle by feeding in the dark?

You should water at the very beginning of the light cycle or when it's warm enough if you are in a cold winter month. I try not to water my plants until the temp of the water and the air are within 2 degrees.

If you are using soil pick up your pots when they are full of soil, but completely dry. That is what your pot weighs dry. When you pick up your pots and they almost feel that weight, it's time to water. You really want to let the soil dry out and you soak it again. This allows the roots to get oxygen and avoid root rot. Mixing perilite in your soil at 1/3 will help you avoid the overwatering problem by allowing that oxygen in.

Good luck, happy growing, and future smoke.

i can see the roots in the bottom of my pot do i risk root boundage or sumthing of that sorts