Originally Posted by Totah Sam
It's best to change out the soil with each grow. You'll have residual nutrients in the soil that can damage or kill young seedlings/clones. Cannabis plants require a ph level between 6.3 to 6.7 for optimum growth and prevent hermies. If you go above or below this ph level for prolonged periods; your plants will experience what is called, "nutrient lockout." It will prevent your plants from getting the nutrients they needs to survive. You can use potting soil but nutrients are essential. Otherwise, your plant will starve to death before she can flower. You will also risk raising males or hermies.
Cannabis plants have few requirements but these requirements are absolute. Ph 6.3 to 6.7/temperature 70-76 degrees/consistent light cycles and make sure there are no light leaks during your dark cycles/As your plants grow, make sure you transplant to larger pots as you go. This is to prevent your plants from becoming root bound (this is bad).
O.k., I'll stop rambling now and go to sleep. :p I hope that helps.
