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Hey good luck on your Blackjack grow, hers a pic of my Blackjack on day 21 of flowering. They were vegged for 5 weeks under a 400w MH in 4 gallon airpots (organic soil grow) and now under a 400w HPS. They are in a growlabs GL120 tent (48"x48"x78") I plan to harvest around the end of August or first week of September. I plan on doing a grow journal, but waiting untill harvest and curing is done before posting a complete journal. Good luck on your grow and I will be watching.
Stlmatt