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Jack Flash #5 Feminized Seeds by Sensi Seeds give you a potent, high-yielding hybrid that combines euphoric energy with reliable growth and a bold citrus-pine aroma — perfect for daytime inspiration and creative flow.
Feeling overwhelmed by strains that promise energy but leave you anxious or unfocused?
Too many sativas are all buzz and no balance — harsh highs, spindly plants, disappointing yields. You want something that lifts your mood without burning you out, that grows strong without constant babysitting.
Jack Flash #5 is your reset. Born from Jack Herer, Super Skunk, and Haze, this 65% sativa hybrid delivers a smooth, uplifting high with enough indica calm to keep you grounded. It’s built for growers who want big harvests — up to 600 g (21.17 oz) per plant outdoors — without sacrificing quality or sanity.
Jack Flash #5 cuts through the noise with stable genetics and a balanced effect. Whether you're chasing creativity or just need a mental boost, this strain adapts to your rhythm. Its robust structure handles indoor training techniques like SCROG or SOG, while its resilience shines in sunny, Mediterranean climates. No more fragile sativas that collapse under their own weight — this one stands tall and delivers.
Quick overview: feminized photoperiod strain from Sensi Seeds, 55–75 day flowering, medium difficulty, ideal for indoor or Mediterranean outdoor grows.
For a hassle-free start, Kit Hesi Starterbox Soil gives seedlings the perfect balance of nutrients and pH stability.
In sustained growth, Dutch Formula Grow 1 keeps foliage lush and structure strong without overfeeding.
At the end of flowering, Sensi Cal-Mag Xtra helps prevent deficiencies and supports dense, resinous bud development.
It’s better suited for growers with some experience. While stable, its height and high odor require good ventilation and space management.
One is tall and slender like a sativa, great for vertical grows. The other is compact and bushy, perfect for SOG setups. Both produce heavy, trichome-rich buds.
Absolutely. Keep it under 1.10 m (3.61 ft) with LST or early topping. Use a carbon filter — its citrus-pine smell is strong during flowering.
After 55–75 days of flowering. For a more energetic high, harvest when trichomes are mostly milky. For more relaxation, wait until some turn amber.
I first grew Jack Flash #5 during a summer in Andalusia — long days, dry air, perfect for sativas. I planted three seeds: one exploded vertically, hitting 2.30 m (7.55 ft), while the other two stayed compact and bushy. All three delivered massive yields, but the tall one was a resin factory — sticky buds that smelled like lemon and pine. I used Pure Zym to keep the roots clean and added PK 13/14 in week 4 of bloom. The high was clear, uplifting, and lasted for hours — perfect for hiking or jamming with friends. Not a couch-lock strain. If you want energy with depth, this is your seed. Just don’t skip the carbon filter.
| Type: | Feminized Regular |
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| Banks: | Sensi Seeds | |
| Phenotype: | 65% sativa / 35% indica | |
| Outdoor height: | more than 100 cm | |
| Indoor flowering period: | 55-75 days | |
| THC: | High |
Yes, the shipment is 100% discreet, no one will know what you have bought, also the sender is SITE OF SHOPS ONLINE.
Yes, we ship to almost every country in the world although you need to know the current legislation in your country to make sure that you do not break any regulations with the germination of the seeds.
UK: 3-4 days (express)
USA: 4-5 days (express)
Australia: 4-5 days (express)
Japan: 4-5 days (express)
Canada: 4-5 days (express)
South Africa: 4-5 days (express)
New Zealand: 5-7 days (express)
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The customer must be informed about the laws of their country regarding seeds or other products that may be purchased on our website, the possession of which may constitute a criminal offence in the country of receipt.
We cannot be made responsible for the wrong use that some people decide to give to the seeds, so please don't act against your national laws.
Due to problems with customs you can check here for restrictions to certain countries.
We accept the following payment methods: Bank transfer, Cryptocurrencies, cash, credit and debit cards and cash on delivery (Spain, Belgium, France, Italy, Portugal).
You can change the currency on the top right to know the price of the products in your local currency and of course pay this way.
In 24/48 hours we will ship your order.
If you live in a country where the cultivation of cannabis is legal and you decide to plant the seeds, it is good that you know that all the seeds that we commercialize have germination guarantee.
If you germinate with the method of paper napkins and you have followed all the steps that we indicate here, you will only have to return us the seeds not germinated in their original packaging and when we receive them we will proceed to the change.
Then we take care of requesting the return to the seed bank, we do not transfer this responsibility and time to our customers.
If you receive a broken product due to transport, you have to notify us within 24 hours for insurance coverage, always contact us as soon as possible and we will fix the problem!
Among all those who comment or send us your questions, there will be a monthly raffle for a €50 voucher for your purchases at Pevgrow. What are you waiting for? Write us and participate!