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is a 5L pot big enough to grow and flower a himalaiyan kush and crastal weed

The size of the pot, along with other factors, will determine how big the plant can get. In a confined space you would want to use a pot that small to limit the size of the plant. If you have a full growcloset or growroom use a 3 to 5 gallon pot to allow the plant to get bigger and produce more product. Outside use a 25 gallon or larger pot to allow the plant to achieve full potential.