How to grow Black Jack
Seb's take
Black Jack reads like an encyclopedia of Old World genetics, Black Domina and Jack Herer up front, with Northern Lights, Hash Plant, Afghani, Shiva Skunk, and Haze somewhere in the footnotes. Herbal and woody with a spiced, incense-like edge and a touch of citrus, the high lands happy and euphoric with just enough energy to stay upright. A history lesson, rolled.
Growing Black Jack: what to expect
Feminized photoperiod stock. You control when she flowers, which is a responsibility as much as a convenience; the light schedule guide keeps you on the right side of it.
She takes a conventional 9 weeks to flower. Conventional is underrated; so is knowing what week you're in.
At around 300 cm, headroom is the whole conversation. Measure your tent, then measure it again — the light planner will keep the light off her canopy.
Expect 500 – 600 g/m² — a working grower's yield, reliable rather than theatrical. The harvest guide will see it in safely.
Listed at 21% THC — potent, verifiably. The figure comes from the breeder's testing, not from our enthusiasm.
She smells of earth and heritage; nothing invented, nothing added.
The dominant note in the reviews is uplifting; daytime company, by most accounts.
Learn to grow her properly:
Common questions about Black Jack
How long does Black Jack take to flower?
Around 9 weeks of flowering, by the breeder's numbers.
Is Black Jack an autoflower or a photoperiod strain?
A feminized photoperiod strain — flowering starts when you switch the lights, so the timing is yours to control.
How tall does Black Jack grow?
Around 300 cm. Plan your headroom before she plans it for you.
How strong is Black Jack?
The breeder lists THC around 21%. Firmly in the strong band.