Yo man,
epson salts are only required if your plants are showing a magnesium deficiency. Shown by the paling of the lower leafs in between the veins, with the veins remaining dark green.
If you are using biobizz ferts you will need some epson salts as biobizz have very little magnesium in them. I use biobizz and give them a heaped table spoon per 10 l at week 3, day 21, this tends to hold it at bay.
lk gives them a tea spoon per 5l i think, i'd give them this amount if they show further sign of deficiency after week 3. These amounts are the concentration of nutrient to be used, you do not need to give the entire 5l to one plant, just as much water as you normally would
Oh and yeah magnesium is very important, its used for photsythesis/energy transfer i think, something like the iron in our blood
"Medicines often produce side effects. Sometimes they are physically
unpleasant. Cannabis too has discomforting side effects, but these are not physical
they are political"
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