How to Grow Modified Grapes
Modified Grapes is a very potent, mostly indica feminized hybrid that crosses GMO with Purple Punch. The result is a 60% indica plant with a high 25-27% THC, a grape, fruity, earthy, spicy and sweet flavor, and a relaxed, happy and euphoric effect. It pairs the pungent, savoury character of GMO with the fruity grape sweetness of Purple Punch on a productive, resinous plant.
This is a feminized, 60% indica photoperiod hybrid of moderate height, 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 and the whole crop productive. Its GMO and Purple Punch roots give it a sturdy structure and a very resinous, high-THC harvest.
Recommended Strains
Modified Grapes
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THC | 25% - 27% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 60% Indica / 40% Sativa |
Amnesia Lemon
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THC | 18% - 21% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 40% Indica / 60% Sativa |
Pungent, fruity and genuinely strong, Modified Grapes is a rewarding way to grow a high-THC indica hybrid with a bold flavor. You can see the full genetics and buy Modified Grapes seeds on the strain page, and browse the rest of our high-THC seeds alongside it.
Strain Profile at a Glance
| THC | High (25-27%) |
|---|---|
| Lineage | GMO x Purple Punch |
| Type | Feminized (photoperiod) |
| Genetics | 60% Indica / 40% Sativa |
| Climate | Temperate, warm |
| Flowering time | 8-9 weeks |
| Harvest (outdoor) | September |
| Height | 4.92 ft / 1.5 m |
| Yield indoor | 1.64-1.97 oz/ft² (500-600 g/m²) |
| Yield outdoor | 17.64-21.16 oz/plant (500-600 g/plant) |
| Grow difficulty | Moderate |
| Flavors | Grape, Fruity, Earthy, Spicy, Sweet |
| Effects | Relaxed, Happy, Euphoric |
Promos & Deals
Growing a Feminized Photoperiod Strain
Modified Grapes 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 60% indica it grows fairly compact and bushy at around 1.5 m, so give it an open canopy and a little low-stress training to spread the light evenly across its productive, resinous structure.
Climate and Where to Grow It
Modified Grapes does well in a warm, temperate or Mediterranean-style climate with plenty of sun, steady warmth and good airflow. Its GMO and Purple Punch heritage makes it a vigorous, adaptable plant, and outdoors it suits a season that lets its resinous buds ripen fully and finish by around September, before the autumn damp sets in.
It performs well indoors and out. Indoors it returns a strong 500-600 g/m² in a well-managed tent, while outdoors a healthy plant with room and sun gives a good 500-600 g. As a fairly compact indica of about 1.5 m it stays manageable in height, so the main job is keeping the canopy open so light and air reach the lower buds.
Keep humidity under control through flowering to protect the dense, resinous colas: around 55-60% in early bloom, nearer 40-45% as the buds fill out, and lower toward harvest. A chunky, high-THC indica can hold moisture inside its buds, so steady airflow and sensible humidity are what keep the finish clean. Cooler nights late in flower can also help bring out purple tones from the Purple Punch side. Aim for daytime temperatures around 70-82°F (21-28°C).
Feeding Schedule (EC Guide)
Modified Grapes 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 grape, fruity and spicy 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 Modified Grapes to a 12/12 light schedule it flowers in 8 to 9 weeks, a reasonable window for such a potent, resinous indica. As a mostly indica plant it stacks dense, chunky, frosty buds on a compact frame rather than stretching tall, so you get a lot of high-THC flower in a modest footprint. Grown outdoors in a warm climate it is typically ready to harvest around September.
Yields are strong: around 500-600 g/m² indoors and a good 500-600 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 grape-and-spice flavor and the strongest effect from its very 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 indica, because its sticky, dense 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 grape, sweet and earthy, savoury notes and smooths the smoke, which matters on a GMO-and-Purple-Punch cross where that contrast of fruity sweetness and pungent earthiness is the whole character.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Modified Grapes is a very resinous, trichome-heavy plant, so its trim works especially well for dry sift, bubble hash or rosin. Given its very high THC, that trim makes for a strong, flavourful grape-and-earthy concentrate run from material most growers would otherwise throw away.
Flavor and Terpenes
Modified Grapes has a bold, contrasting profile: a ripe grape and fruity sweetness from its Purple Punch side set against the pungent, savoury, earthy character of GMO, with a spicy edge tying them together. It is a rich, full flavor rather than a light one, and a good cure really brings that grape-sweet-and-earthy character forward in the jar and on the inhale.
Its terpene profile is led by two dominant terpenes. Myrcene lays down the ripe, fruity-earthy base that carries the grape sweetness and drives the heavy indica body, while caryophyllene adds the warm, peppery spice that gives the flavor its spicy edge and pairs with the savoury GMO side. Together these two frame the grape, fruity, earthy and spicy character Modified Grapes is known for.
Effects and Best Use
With its very high 25-27% THC and mostly 60% indica make-up, Modified Grapes delivers a strong, body-forward experience. It is reported as relaxed, happy and euphoric: an uplifting, cheerful lift that settles into a deep physical relaxation, a potent effect that reflects its high THC. Because the THC runs very high, it is well worth starting with a moderate amount, especially if you have a lower tolerance.
That relaxed, euphoric profile makes it best suited to the evening and to those comfortable with a strong, high-THC strain. The combination of a productive grow, a solid yield and a bold grape-and-earthy flavor, all with a very high-THC kick, is exactly why it stands out.
Common Problems and Pro Tips
The most common issue with a resinous, high-THC indica like Modified Grapes is moisture getting trapped in the dense, sticky buds late in flower. Keep the air moving around and through the canopy, hold humidity down as the flowers fill out, and don’t let the plant sit in still, damp air. Defoliating a few of the largest fan leaves in mid-bloom helps light and air reach the lower buds.
Because it is a fairly compact indica, train it early. A little low-stress training or a light topping in veg opens the canopy and turns one dominant cola into several even ones, which suits its productive structure and lifts the yield. Give it a sturdy frame, as those heavy, frosty colas gain weight toward the end of flower.
As a pro tip, respect the potency: this is a very high-THC strain, so cure it well for three to four weeks to make the strength smooth and enjoyable, and start with a moderate amount when you first try it. Protect the grape-and-earthy flavor with a clean plain-water flush, and let nights run a little cooler late in flower to coax out any purple from its Purple Punch side.
FAQ
Is Modified Grapes a feminized strain?
Yes. Modified Grapes 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, since there are no males to find and cull.
How much THC does Modified Grapes have?
Modified Grapes is a very high-THC strain, testing at around 25-27%. Because it runs so high, it is well worth starting with a moderate amount if your tolerance is lower. Combined with its mostly 60% indica genetics, the result is a relaxed, happy and euphoric experience that leans body-forward and suits evening use.
How long does Modified Grapes take to flower?
Modified Grapes flowers in about 8 to 9 weeks once you switch it to a 12/12 light schedule. As a photoperiod strain you also control how long it vegetates beforehand, which sets its final size. Grown outdoors in a warm, temperate climate it is usually ready to harvest around September, once the trichomes have turned mostly cloudy.
What does Modified Grapes taste like?
It has a bold, contrasting profile: a ripe grape and fruity sweetness from Purple Punch against the pungent, savoury earthiness of GMO, with a spicy edge. Its two dominant terpenes drive this: myrcene gives the fruity-earthy grape base, and caryophyllene the peppery spice. A proper cure brings the grape-sweet-and-earthy character forward.
How much does Modified Grapes yield?
Modified Grapes is a strong producer, giving around 500-600 g/m² indoors and 500-600 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 lightly for an even canopy, and support those heavy, frosty colas as they develop.
Who is Modified Grapes best suited to?
With its very high 25-27% THC and bold GMO-and-Purple-Punch flavor, Modified Grapes suits growers and users who are comfortable with a strong, potent strain. The grow itself is a vigorous, productive indica; the main thing to plan for is the high potency, so start with a moderate amount and cure it well for the smoothest result.
