How to grow Hash Burger seeds, Leafly Strain of the Year 2025

Now that it’s been crowned Leafly Strain of the Year 2025, growers are chasing down Hash Burger seeds. Each one of these cannabis seeds contains the genetic make-up of a savory, gas-soaked, resin-loaded hybrid. Hash Burger is one of the most flavorful and rewarding strains a home grower can take on right now.

Ever since the crowning of Hash Burger, Seed Supreme has been fielding questions from growers about how to get the best results from this beauty. So, if you are thinking about growing Hash Burger, look no further; this guide has all you need to know to take you step by step from seeds to impressive yields.

The ins and outs of Hash Burger

Before you start, it helps to understand what you’re working with. Hash Burger aka Hashburger, is an indica-dominant resin-oozing plant bred by California Seed Bank and their lead breeding power couple, Respect and Mrs. Respect. It’s a cross of Han Solo Hash Plant with Double Burger. 

The result is a savory gas-forward, umami monster of a strain with a nose of garlic, pepper, and diesel notes. Hash Burger’s flavor is off-the-charts, no wonder it’s been crowned Leafly Strain of the Year. 

The effects of this strain feel heavy and physical, making these cannabis seeds popular with growers looking for evening use, pain relief, and sleep. Hash Burger is the kind of strain you save for the end of the day. Here is a snapshot of what is contained within these Hash Burger feminized seeds.

• Genetics: Han Solo Hash Plant x Double Burger
• Type: Indica-dominant hybrid (60/40)
• THC: 20–30%
• Dominant terpenes: Myrcene, caryophyllene, limonene
• Flowering time: 8–10 weeks
• Yield: Moderate to high
• Grow difficulty: Moderate

Step one: Set up your grow space

Hash Burger feminized seeds perform best indoors. Both of Hash Burger’s parent strains were bred for controlled environments, and this strain inherited low mold resistance from its Han Solo Hash Plant side, so managing humidity is critical. For a full indoor setup, you’ll need:

• Grow tent or dedicated room with good ventilation
• High-quality LED or HPS lights with a timer
• Inline fan with carbon filter (Hash Burger gets loud on the nose)
• Oscillating fans for canopy air circulation
• Thermometer and hygrometer
• 5-gallon pots (airpots work well) with organic soil and perlite
• Nutrients for veg and bloom, pH meter (target 6.2 to 6.8 in soil)
• SCROG net or plant ties for training

Growing outdoors? Stick to warm, dry climates (70 to 80°F) with six to eight hours of direct sun, large pots with well-draining soil, and pest prevention on hand. Have a rain plan: tarps, covered structures, or the ability to move pots under shelter. Given the low mold resistance, humidity management is non-negotiable outdoors.

Step two: Germination and planting

Cannabis seeds are hardy little things, so it’s recommended to use the soak or the paper towel method to ensure germination success and robust growth. Soak your Hash Burger seeds in water for 12 to 24 hours until they crack and a taproot emerges, then transfer them into small pots or seedling plugs. The paper towel method also works: place your Hash Burger seeds between damp paper towels on a plate, cover, and keep in a warm, dark spot until the taproot shows.

Keep temps around 70 to 78°F and humidity at 65 to 70%. Light should be gentle, around 100 to 300 µmol/m²/s PPFD. Hash Burger can have a slow seedling phase, so don’t panic if growth seems sluggish at first. It picks up once the root system establishes.

Step three: Vegetative growth

Hash Burger is a light-demanding beast of a cannabis strain. Run your lights on an 18/6 schedule (18 hours on, six off). Aim for 400 to 600 µmol/m²/s PPFD. Keep daytime temps at 72 to 80°F with a drop of 8 to 10 degrees at night, and humidity around 50 to 55%. Feed with a nitrogen-forward nutrient schedule to support the rapid branching Hash Burger puts out.

The Hash Burger strain grows bushy and compact with tight internodal spacing, so start low-stress training (LST) early to open up the canopy. Gently bend and tie down branches to create an even, flat canopy that lets light reach all the bud sites. Topping the main stem once or twice promotes multiple cola sites instead of a single dominant top. If you’re running a SCROG, this is the time to start tucking branches under the screen and filling it evenly.

Give Hash Burger feminized seeds a full five to six weeks of veg. This strain starts slow, and rushing the flip will cost you yield. Patience in veg pays off significantly at harvest!

Step four: Flip to flowering period

It’s about to get exciting, seeing Hash Burger cannabis plant in the flowering period is a beautiful thing. Switch your lights to a 12/12 schedule to trigger flowering. Expect a bit of a stretch of 1.5–2x in the first two to three weeks, mostly vertical growth as the Hash Burger transitions. This is normal and manageable indoors, especially if you’ve been training during veg. Push PPFD up to 700 to 900 µmol/m²/s as the plant starts to flower.

One thing specific to Hash Burger: don’t cut nitrogen sharply at the flip like you would with most strains. This one wants continued nitrogen into early flower, and the plants will drink heavily during the transition. Growers who have run Hash Burger consistently note that it needs more nitrogen in the first two weeks of 12/12 than a typical indica hybrid. 

Once buds start stacking in earnest, shift to phosphorus and potassium-dominant feeding to fuel bud development. Organic amendments like compost teas and worm castings tend to produce a more complex terpene expression with this strain, which is worth the effort for a cultivar like Hash Burger, where flavor is the entire selling point.

Step five: Manage the bloom

This is where environmental control earns its keep. Like many other cannabis strains, Hash Burger strain prefers lower temps during flower, a bit like what happens outdoors. Drop temps slightly to 70 to 76°F and get humidity below 50%, aiming for below 45% in the final two to three weeks. 

Hash Burger’s strain is characterized by dense buds that are its biggest mold vulnerability. Those tightly packed colas look incredible, but they trap moisture inside, and if relative humidity stays too high, bud rot can take hold fast.

Airflow is non-negotiable. Run your oscillating fans, and do two defoliation passes: once around day 21 of flower to open up the interior, and again around day 42 to keep air moving as buds pack on weight. Don’t over-strip; the goal is light penetration and air circulation, not bare stalks. Set up trellis or plant supports too, as the colas get heavy enough to lean branches late in bloom.

PPFD can go up to 900 to 1000 µmol/m²/s during peak bloom (weeks 5–8), but only if temperature, humidity, and nutrition are fully dialed in. Without those locked, more light just means more stress.

Most phenotypes finish in 8–10 weeks of flower, with week nine being the sweet spot for many.

Step six: Harvest

To ensure a productive cannabis harvest, watch the trichomes, not the calendar. Use a jeweller’s loupe or a digital microscope to get a close look at the trichome heads on the buds (not the sugar leaves). Mostly cloudy with 10 to 20% amber heads is the target for peak potency THC and full terpene expression. More amber deepens the body effects but can dull the headspace, so dial the timing to the experience you prefer.

Step seven: Dry and cure

This is the step most beginners rush, and with Hash Burger, it’s the one you can least afford to. The strain’s signature savory profile (the garlic, the gas, the funk) develops its full complexity during drying and curing. Cut corners here, and you’ll lose the very thing that makes this strain special.

Hang whole Hash Burger plants or large branches in a dark space at 59 to 64°F and 58 to 62% humidity. Whole-plant hanging slows the drying process and preserves terpenes. Aim for 10–14 days with good air exchange but no fans blowing directly on the buds. When stems snap cleanly instead of bending, the buds are ready to trim.

Move trimmed buds from Hash Burger into airtight glass jars and cure for at least two weeks. Burp the jars daily for the first few days to release excess moisture, then every few days after that. Some growers cure Hash Burger for four weeks or more and find the flavor continues to deepen. 

Those are the steps you need to grow the Leafly Strain of the Year 2025 at home. Get the environment right, don’t rush the veg or the cure, and Hash Burger will reward you with some of the most flavorful bud you’ve ever harvested. For Hash Burger feminized seeds backed by a germination guarantee, and any other strain that you want in your grow, Seed Supreme has you covered with all the seeds you need at a price you can’t beat.