You should always rinse a plant off before putting it into the tank. There are 2 types of pesticides used in commercial growing, topical and systemic. Topicals are the most common used for house/garden plants. They are sprayed on, and will be removed with a nice rinsing of the plant or a rainstorm. Systemic pesticides are a spray pesticide used primarily in agricultural applications. They soak into the soil and the plant then absorbs it into itself via the root. The will stay within the plants for a few months. That's why they are used for agricultural applications. It would get expensive to spray a crop after every rainstorm.
So basically, if you rinse a plant well, you are good. If you want to grow them out in a qt grow tank, it will take, on average, about 6 months to grow out any systemic pesticides. Although, IMHO, this is unnecessary, especially in this day and age where "organic" is the trend.
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