How to Grow Black Jack

Black Jack is a 55% indica-leaning feminized strain and an Emerald Cup 2019 winner, a cross of Black Domina and Jack Herer. It carries a THC level of 15 to 19%, which sits in the medium range, and delivers a happy, munchie-inducing and relaxed effect over a citrus, pine, sweet and woody flavor. This guide walks you through the whole grow, from germinating the seeds to the final cure.

It reaches a medium 1.5 m, flowers in 8 to 10 weeks, and finishes outdoors through October with a high yield. Its award-winning genetics, balanced structure and forgiving nature make it a strong pick for first-time growers.

Recommended Strains

Black Jack

	THC	15% - 19% (Medium)
	Type	Feminized
	Yield	High
	Phenotype	55% Indica / 45% Sativa

1 Seed - $17.503 Seeds - $426 Seeds - $659 Seeds - $8025 Seeds - $19550 Seeds - $320100 Seeds - $580 Add to cart

Black Jack Auto

	THC	17% - 19% (Medium)
	Type	Autoflowering
	Yield	High
	Phenotype	45% Indica / 55% Sativa

1 Seed - $17.503 Seeds - $426 Seeds - $659 Seeds - $8025 Seeds - $19550 Seeds - $320100 Seeds - $580 Add to cart

Black Jack at a Glance

Before you plant anything, it helps to see the full picture in one place. Here is the quick profile for this award-winning, piney hybrid, taken straight from the strain’s grow data.

These are feminized seeds, so every plant flowers female and you skip culling males. Its 55% indica lean places it among the indica seeds, while its strong harvest earns it a spot with the high-yielding seeds. If you are still weighing options, the find your strain tool helps you match it against the rest of the catalog.

How to Germinate Black Jack Seeds

A healthy harvest starts at germination. The paper towel method is hard to beat: fold the Black Jack seeds inside two damp sheets, slide them between two plates, and keep them somewhere dark at 70 to 79°F. A taproot usually appears in two to five days.

Once the taproot is a few millimeters long, move each seed root-down about 1 cm deep into a small pot of light, airy medium. Keep it lightly moist rather than soaked, hold humidity around 65 to 70%, and give soft light while the first true leaves open. Its hybrid vigor makes for a strong, dependable seedling.

Starter tips

• Use plain, lightly pH-balanced water (pH 5.5 to 6.5) for the first week.
• Keep seedlings warm and humid, but never waterlogged.
• Hold off on nutrients until the second set of serrated leaves appears.

Growing Black Jack in the Vegetative Stage

As a photoperiod plant, you control the veg stage with the light schedule. Keep Black Jack on 18 hours of light a day for as long as you want it to grow, aim for day temperatures of 68 to 79°F, and hold humidity around 50 to 60%. It suits a temperate climate, so steady, moderate conditions work in its favor. With its near-even, 55% indica split it builds into a medium, sturdy plant of about 1.5 m.

This is the stage to shape the plant. Topping early and using low-stress training to spread the branches opens up the canopy, improves airflow, and lifts the yield. Give it room so light reaches the lower buds, and it rewards the effort with an even, productive spread.

Its medium frame and October finish make it a flexible plant both indoors and out:

• Temperate outdoor plots: its October harvest fits regions with mild summers and a dry early autumn.
• Mediterranean-style gardens: steady warmth and good airflow let it stack its resinous buds through flower.
• Indoor tents: at around 1.5 m it stays workable under lights and keeps a tidy, even canopy.

Flowering and Buds of Black Jack

Indoors, flip Black Jack to a 12/12 light cycle to trigger flowering, which runs 8 to 10 weeks. Outdoors it ripens through October. It shows a moderate stretch after the flip, a nod to its Jack Herer side, then packs on dense, resin-coated, chunky buds from its Black Domina half.

Through bloom, drop humidity to 40 to 45% and keep air moving so the tightening flowers do not trap moisture. The buds build a bright citrus and pine aroma with a sweet, woody depth, the zesty Jack Herer side meeting the dense Black Domina backbone.

At 15 to 19% THC it sits in the medium range, giving a happy, relaxed effect that can bring on the munchies, a mellow, comfortable feel.

Common Problems and Pro Tips

Black Jack is beginner-friendly, but its dense buds and bright aroma point to a few things worth watching.

• Bud rot in dense colas: its tight, resinous flowers can trap humidity, so keep a fan moving and humidity below 45% late in flower.
• Support the branches: the chunky, resinous colas can weigh the limbs down, so stake or net them as they fill out.
• Watch the smell: its bright citrus-pine nose grows loud in flower, so run a carbon filter indoors if odor is a concern.

Expert tip: the sturdy, resinous structure rewards a clean grow. Top early, keep an even canopy through a short veg, and dry and cure slowly to lift the bright citrus and pine over its sweet, woody base.

Aroma, Flavor and Effects

The nose is bright and grounded: fresh citrus and crisp pine up front with a sweet, woody depth underneath. It is a lively, mouth-watering profile that blends zesty top notes with an earthy base, a nod to its Jack Herer and Black Domina roots.

The flavor follows the nose, citrus and pine with a sweet, woody finish. On the effect side it is happy, relaxed and munchie-inducing, a mellow, comfortable feel that settles the body. Because THC runs a moderate 15 to 19%, it stays rounded and approachable.

Dominant terpenes

Black Jack carries a well-rounded terpene profile built on five main players. Myrcene lays down an earthy, musky base, Pinene brings a crisp pine sharpness that fits its piney side, Caryophyllene adds a warm, peppery spice, Humulene a dry, woody note, and Linalool a soft floral touch. Together these five shape its citrus, pine and woody character.

Nutrient Schedule

Treat the figures below as a starting map, not a rulebook. Black Jack is a steady feeder, so read the plant first: tip burn means back off, while pale, slow growth means it wants a little more. All values use EC.

Keep the pH around 6.0 to 6.5 in soil and 5.5 to 6.0 in hydro so the roots can actually take up what you feed.

What to Do With Your Trim: Extracts and Hash

Black Jack builds a solid coat of resin, so its trim is worth keeping rather than tossing. The sugar leaves you take off while manicuring hold trichomes and suit Ice Water Hash, where cold water and agitation separate the resin heads into a clean, solventless concentrate. Pressing that hash into rosin keeps the citrus-pine flavor intact, or you can run a solvent extraction if that is your setup. The bare stems will not extract, but chopped and composted they feed organic matter back into the soil for your next grow.

Harvesting, Drying and Curing Black Jack

Timing the harvest comes down to the trichomes. Grab a loupe and watch the heads turn from clear to milky white; a scattering of amber signals peak ripeness. Indoors this lands 8 to 10 weeks after the flip, and outdoors the plants are ready through October.

After the cut, hang the branches in a dark room at 59 to 68°F with humidity near 50% and gentle air movement. Slow beats fast: drying over 10 to 14 days protects the citrus, pine, sweet and woody aromas that define this strain. When the small stems snap instead of bending, move the buds into jars.

Cure in sealed glass, opening the jars daily for the first week to let moisture escape, then easing off as the aroma deepens. Two to four weeks of patience here is where the bright citrus and pine really come together over its sweet, woody base, and it is the step most first-time growers rush.

Frequently Asked Questions

Is Black Jack easy to grow for beginners?

Yes, Black Jack is beginner-friendly. Its hybrid vigor makes it forgiving, it reaches a manageable 1.5 m, and it finishes in 8 to 10 weeks. The main things to plan for are its dense, resinous buds, which need support and airflow, and its loud, citrus-pine smell, so run a carbon filter indoors if odor matters.

How long does Black Jack take to flower?

Black Jack flowers in 8 to 10 weeks once you switch it to a 12/12 light cycle indoors. Grown outdoors, it is ready through October. It shows a moderate stretch after the flip from its Jack Herer side, then packs on dense, resin-coated buds over that bloom window.

How strong is Black Jack?

Black Jack has a THC level of 15 to 19%, which places it in the medium range. The effect is happy, relaxed and munchie-inducing, a mellow, comfortable feel that settles the body. That moderate potency makes it a rounded, approachable strain for a wide range of growers and users.

How much does Black Jack yield?

Black Jack is high-yielding. Indoors it gives around 1.47 to 1.64 oz/ft², and outdoors a plant reaches roughly 7.05 to 15.87 oz depending on conditions. Light topping, an even canopy and strong light are what help it fill out to its full potential.

What does Black Jack taste and smell like?

Black Jack leads with a bright citrus and crisp pine aroma over a sweet, woody base. It blends zesty top notes from its Jack Herer side with the earthy depth of Black Domina. Both the aroma and flavor deepen as the buds cure slowly in the jar after harvest.

Is Black Jack an indica or a sativa?

Black Jack is slightly indica-leaning, at 55% indica and 45% sativa, close to a balanced hybrid. Built from Black Domina and Jack Herer, it blends a dense, resinous bud structure with a bright, piney lift, giving a rounded, comfortable effect.