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water and other minerals from the soil to help
it grow. The soil also goes through dry periods when you do not water
your plant or when the plant has absorbed most of the water. During
these dry periods air is allowed to creep in between the soil particles,
allowing the roots to breathe.
There are 3 main factors to look at when buying soil. (1) pH,
(2) Nutrients and (3) Structure.
pH
pH is a way of measuring how much acid and alkaline is in
the soil. The pH scale runs from 1 - 14. 7 is neutral, 0 is very acidic
and 14 is very alkaline. Cannabis plants in soil like a pH of 7. When
choosing your soil you should be looking for a pH of 7. It should tell
you this on the bag. Going above or below this mark can cause your
plant problems during growth. Small pH meters (Figure 5.18) can be
bought in most gardening shops and can be used to measure the
overall pH of your soil.
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Figure 5.18 - This is a picture of two cheap pH meters that can be
purchased from most grow shops.
NUTRIENTS
The three major nutrients that are found in soil are Nitrogen,
Phosphorous and Potassium or NPK for short. NPK can come in two
forms - with the soil or as a stand-alone fertilizer (usually in a bottle).
When you look at the bag you will see that the % of each part is stated.
Such as 20:20:20. This means 20% N, 20% P, 20% K. The remaining
40% is just other elements that make-up the soil. In liquid it would
usually be water. This ratio can change between different types of
nutrient and soil brands so we need to understand what Cannabis likes.
Cannabis plants like good levels of N and a normal level of P
and K during vegetative growth. You need to pick a bag that has all
three, not just 10:20:0. When looking at chemical fertilizers you need
a mixture that has the first number higher or equal to the rest. 12-12-
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12 is fine, 20-20-20 is fine, 12-6-6 is fine and 18-4-5 is fine. The 12-
12-12 and 20-20-20 are the best ones to find. Something like 8-20-20
is not suitable for vegetative growth. Bags with higher P are for
flowering plants. As a grower we do not transplant to new soil for
flowering. We simply use plant feeds to bring up the P levels during
flowering.
STRUCTURE
Try to find a soil that is not too moist. In other words try to
find a soil that dries out well and does not hold water like mud. It
should say on the packet whether the soil is a wet or dry one. Try to
find a balance between the two. Wet soil will sometimes cause plant
damage because your roots need air to breathe. Dry soil may also dry
out too quickly and needs to be watered more often. Try to find a soil
that is loose and feels fine but slightly heavy in your hands.
Basically the soil structure is up to you. Do not buy anything
that is hard and bulky or too soft and weightless. Medium Soft and
heavy is what you want.
SOME COMMON SOIL TYPES
There are many more types of soil mediums out there and
here we will briefly go through a few. Marijuana can be gro

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