How to Grow Key Lime Jack
Key Lime Jack is a perfectly balanced, feminized hybrid that crosses Key Lime Pie with the classic Jack Herer. The result is a 50/50 plant with a high 20-24% THC, a zesty lime, citrus and pine flavor over a herbal base, and a happy, euphoric and relaxed effect. Bright, potent and productive, it is a rewarding grow with a sharp citrus character and the uplifting edge of its Jack Herer side.
This is a feminized photoperiod hybrid of around 1.5 m that flowers in 8 to 9 weeks once you switch it to bloom. Every seed grows into a flowering female, so there is no need to identify the sex or remove males, which keeps the grow simple from start to finish. Its Key Lime Pie and Jack Herer roots give it a sturdy structure, a bright citrus-and-pine profile and a generous, resinous harvest.
Recommended Strains
Key Lime Jack
|
THC | 20% - 24% (High) |
|
Type | Feminized |
|
Yield | High |
|
Phenotype | 50% Indica / 50% Sativa |
Critical Jack
|
|
THC | 20% (Medium) |
|
|
Type | Feminized |
|
|
Yield | High |
|
|
Phenotype | 40% Indica / 60% Sativa |
Zesty, fresh and genuinely strong, Key Lime Jack is a rewarding way to grow a high-THC, balanced hybrid with a sharp lime flavor and an upbeat effect. You can see the full genetics and buy Key Lime Jack seeds on the strain page, and browse the rest of our feminized seeds alongside it.
Strain Profile at a Glance
| THC | High (20-24%) |
|---|---|
| Lineage | Key Lime Pie x Jack Herer |
| Type | Feminized (photoperiod) |
| Genetics | 50% Indica / 50% Sativa |
| Climate | Temperate, warm |
| Flowering time | 8-9 weeks |
| Harvest (outdoor) | October |
| Height | 4.92 ft / 1.5 m |
| Yield indoor | 1.64-1.8 oz/ft² (500-550 g/m²) |
| Yield outdoor | 15.87-17.64 oz/plant (450-500 g/plant) |
| Grow difficulty | Moderate |
| Flavors | Citrus, Lime, Pine, Herbal |
| Effects | Happy, Euphoric, Relaxed |
Promos & Deals
Growing a Feminized Photoperiod Strain
Key Lime Jack is a photoperiod strain, so it flowers in response to the light cycle rather than on age. You grow it under a long day of around 18 hours of light while it builds size and structure, then switch to a 12/12 light schedule to trigger flowering, which runs 8 to 9 weeks from the flip to harvest. Because the seeds are feminized, every plant comes up female and goes on to flower, so you never have to check the sex or cull males.
That control over the light cycle is an advantage. You decide how long to veg the plant and therefore how big it gets before you flip it, which lets you match it to your space. As a balanced 50/50 hybrid of about 1.5 m, it grows with an even structure that can show some Jack Herer stretch early in bloom, so give it an open canopy and a little low-stress training to keep the height in check and spread the light evenly.
Climate and Where to Grow It
Key Lime Jack does well in a warm, temperate or Mediterranean-style climate with plenty of sun, steady warmth and good airflow. Its Key Lime Pie and Jack Herer heritage makes it a vigorous, adaptable plant, and outdoors it suits a season that lets its resinous buds ripen fully and finish by around October.
It performs well indoors and out. Indoors it returns a strong 500-550 g/m² in a well-managed tent, while outdoors a healthy plant with room and sun gives 450-500 g. As a balanced hybrid of about 1.5 m with some sativa vigour from its Jack Herer side, it can gain height, so keep the canopy open and the structure supported so light and air reach the lower buds.
Keep humidity under control through flowering to protect the resinous colas: around 55-60% in early bloom, nearer 40-45% as the buds fill out, and lower toward harvest. A high-THC hybrid with chunky, sticky buds can hold moisture inside, so steady airflow and sensible humidity keep the finish clean. Aim for daytime temperatures around 72-82°F (22-28°C), which this warm-climate plant enjoys.
Feeding Schedule (EC Guide)
Key Lime Jack is a hungry, productive plant, but it still pays to build nutrients up gradually and let the plant set the pace. Feed it steadily through veg and bloom, then taper off for the final flush so the sharp lime and citrus flavor comes through clean and the smoke finishes smooth. The ranges below are a starting guide; adjust to your water and medium.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4-0.6 | Very light feed while roots establish |
| Vegetative growth | 0.8-1.2 | Raise nitrogen as the plant builds size |
| Early flower | 1.2-1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4-1.6 | Peak bloom feed while the buds swell |
| Flush | 0.0-0.4 | Plain water for the final 1-2 weeks |
Flowering and Harvest
Once you switch Key Lime Jack to a 12/12 light schedule it flowers in 8 to 9 weeks, a comfortable window that rewards patience with resinous, citrus-scented buds. As a balanced hybrid it fills out with solid, frosty colas up a moderate frame, with a little of the elongated bud structure its Jack Herer side is known for. Grown outdoors in a warm climate it is typically ready to harvest around October, once the trichomes have turned mostly cloudy.
Yields are strong: around 500-550 g/m² indoors and 450-500 g per plant outdoors with good sun and space. Give it a little training so the lower buds get light, feed it well through bloom, and harvest when most of the trichomes have turned cloudy for the fullest lime-and-citrus flavor and the strongest effect from its high THC.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15-18°C) and 55-60% humidity for 7-14 days, until the thin stems snap rather than bend. A slow, even dry is important with such a resinous, high-THC hybrid, because its sticky buds can stay damp in the middle while the outside dries, and a gentle dry protects both the aroma and the trichomes.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure is what brings out the sharp lime, citrus and pine notes and smooths the smoke, which matters on a Key Lime Pie and Jack Herer cross where that bright, zesty character is the main attraction.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Key Lime Jack is a resinous, trichome-heavy plant, so its trim works especially well for dry sift, bubble hash or rosin. Given its high THC, that trim makes for a strong, flavourful lime-and-citrus concentrate run from material most growers would otherwise throw away.
Flavor and Terpenes
Key Lime Jack is built around sharp citrus: a zesty lime and citrus lift up front, a clean pine and herbal edge from its Jack Herer side, and a bright, fresh character overall. It is a crisp, zesty flavor rather than a heavy or gassy one, and a good cure really brings that lime-and-pine character forward in the jar and on the inhale.
Its terpene profile shapes that character. Limonene drives the zesty lime and citrus lift that defines the aroma, while terpinolene brings the fresh, herbal and pine-like edge that is a hallmark of its Jack Herer parent. Caryophyllene adds a warm, peppery spice and myrcene lays down a soft, slightly fruity base. Together they frame the lime, citrus and pine character Key Lime Jack is known for.
Effects and Best Use
With its high 20-24% THC and perfectly balanced 50/50 make-up, Key Lime Jack delivers a bright, well-rounded experience. It is reported as happy, euphoric and relaxed, so it pairs an upbeat, cheerful lift (helped along by its Jack Herer heritage) with an easy, settled body, making it versatile from the day into the evening. Because the THC runs high, it is worth starting with a moderate amount, especially if you have a lower tolerance.
That happy, uplifting profile makes it a versatile all-rounder, well suited to creative work, socialising or simply enjoying its sharp lime flavor. The combination of a productive grow, a strong yield and a zesty citrus-and-pine flavor, all with a high-THC kick and an upbeat effect, is exactly why it stands out.
Common Problems and Pro Tips
The most common challenge with Key Lime Jack is its Jack Herer stretch: it can gain real height in early flower, so top or train it in veg and be ready to tie down or support the taller branches. Keep the air moving around and through the canopy, hold humidity down as the flowers fill out, and defoliate a few of the largest fan leaves in mid-bloom so light and air reach the lower buds.
Because it is a vigorous, productive plant, give it structure. A little low-stress training or a light topping in veg opens the canopy, turns one dominant cola into several even ones and keeps the height manageable, which suits its half-sativa frame. Support the branches, as those resinous colas gain weight toward the end of flower.
As a pro tip, protect the lime-and-citrus flavor, since it is the appeal of this strain: run a clean plain-water flush at the end and cure for three to four weeks, which brings that sharp, zesty character to its best. Harvest on the earlier, cloudier side of the trichome window to keep the brightest, freshest citrus notes.
FAQ
Is Key Lime Jack a feminized strain?
Yes. Key Lime Jack is a feminized photoperiod strain, so every seed grows into a flowering female and you never have to identify the sex or remove males. You grow it under long days, then switch to a 12/12 light schedule to start flowering. That keeps the whole crop productive and makes the grow more straightforward, with no males to find and cull along the way.
How much THC does Key Lime Jack have?
Key Lime Jack is a high-THC strain, testing at around 20-24%. Combined with its balanced 50/50 genetics, the result is a happy, euphoric and relaxed effect that works from the day into the evening rather than tying you to one time of day. Because the THC runs high, it is worth starting with a moderate amount if your tolerance is lower.
How long does Key Lime Jack take to flower?
Key Lime Jack flowers in about 8 to 9 weeks once you switch it to a 12/12 light schedule, a comfortable window that rewards patience with resinous buds. As a photoperiod strain you also control how long it vegetates beforehand, which helps you manage its Jack Herer stretch. Outdoors in a warm climate it is usually ready to harvest around October.
What does Key Lime Jack taste like?
Key Lime Jack has a sharp, zesty flavor built around lime and citrus, with a clean pine and herbal edge from its Jack Herer side. Limonene drives the lime and citrus lift, terpinolene the fresh, piney character, caryophyllene a peppery spice and myrcene a soft base. A proper three to four week cure really brings that bright, zesty character forward.
How much does Key Lime Jack yield?
Key Lime Jack is a strong producer, giving around 500-550 g/m² indoors and 450-500 g per plant outdoors with good sun and space. Results depend on light, pot size and canopy health, so keep the plant well fed through bloom, train it to manage its height, and support those resinous colas as they develop toward harvest.
Who is Key Lime Jack best suited to?
With its sharp lime flavor, upbeat Jack Herer-leaning effect and high 20-24% THC, Key Lime Jack suits growers who want a bright, versatile hybrid with real potency. The grow itself calls for a little height management thanks to its sativa side, so it rewards a grower happy to top or train, and its strong yield pays back that bit of extra attention.
