Black Jack Feminized Seeds

Black Jack is a cross of Black Domina and Jack Herer, two very different plants. Black Domina is a dark, heavy indica with a hashy, earthy smell. Jack Herer is a famous sativa-leaning hybrid with pine and spice. The strain label lists the result as an even split, 50% indica and 50% sativa, with THC at 23%.

These seeds are feminized, and the plants are photoperiod: they bloom after you change the light to 12/12.

Pine, spice and wood

The smell is the clearest sign of both parents. Jack Herer brings pine and a peppery spice; Black Domina adds a woody, almost sandalwood depth and some hash. A sweet, floral note sits on top in many plants, especially after curing. It is a strong smell late in flower, so plan for a carbon filter indoors.

Effects

Black Jack splits the difference between its parents. Smokers describe a clear, alert start from the Jack Herer side, followed by a warm, heavy body feel from Black Domina. At 23% THC it is a strong hybrid.

Because the split is an even 50/50, it works across much of the day. Most people save larger amounts for the evening, when the hashy, heavy side shows up more.

Flowering, harvest and cure

Black Jack flowers in 8 to 10 weeks on a 12/12 schedule. Expect a mix of phenotypes: indica-leaning plants make tight, dark colas, while sativa-leaning ones throw longer, more open flowers with extra stretch.

Check the trichomes with a loupe. Cloudy with some amber suits a balanced effect, and waiting for more amber pushes it heavier. Dry the tight buds slowly with steady airflow around the room and no fan aimed at the flowers, about 7 to 12 days. The open phenotypes dry a few days faster. Jar at stem-snap and burp for two weeks. The floral note rises after a few weeks in the jar.

Growing Black Jack in Canada

Start seeds indoors in April or early May, then plant out once frost is done, usually late May. Black Jack grows medium tall, so a 40 L bed or a large fabric pot gives it room to fill out over the summer.

The plant flips as the days shorten in August. With 8 to 10 weeks of flower, finish between late September and mid October. Cut the earlier phenotypes first and give the sativa-leaning ones the extra week.

In Ontario and Quebec, September humidity is the danger for the tighter, indica-leaning colas. Space plants wide, defoliate the inner leaves and harvest on a dry day. A south wall helps the colas ripen before the nights turn cold.

Black Jack outdoor calendar for Canadian cities

Black Jack is a photoperiod plant, so outdoors it starts flowering in early August, when the nights get longer. Add its 8 to 10 weeks of flowering and you get the harvest window below.

Dates use typical frost dates for each city and shift a week or two with the year, so check your local forecast before planting out and in late September.

Who Black Jack suits

Black Jack suits growers who like a balanced plant and do not mind sorting phenotypes. A tent of 1.2 m by 1.2 m or larger works with a single topped plant, and outdoors it fits a sunny, sheltered bed. It is a decent choice for a first photoperiod run with some space.

Similar strains at The Seed Pharm

Strains that share Jack Herer's pine and spice or a balanced profile.

• Jack Herer 1:1 CBD Seeds uses Jack Herer as a parent in a CBD-balanced version.
• Blue Dream Feminized Seeds is another balanced hybrid with a sativa-leaning nose.
• Purple Haze Feminized Seeds is a classic with a similar spicy, hazy profile.

How it compares

Figures from each strain's label in our catalogue.