Lemon Citron

Lemon Citron Feminised Cannabis Seeds by Humboldt Seed Organization

Lemon Citron is a feminised photoperiod cannabis seed that delivers sharp citrus flavour and heavy harvests in a surprisingly short flowering window. Bred by Humboldt Seed Organization from Lemon Tree (Sour Diesel x Lemon Skunk) crossed with Geist OG, this 70% indica / 30% sativa hybrid grows aggressively, finishes fast, and produces resinous flowers that smell like you've just zested a dozen lemons over the trim tray. If you want flavour without sacrificing yield, this is where you start.

Lemon Citron Genetics and Lineage

Lemon Citron's flavour profile didn't happen by accident. Humboldt Seed Organization started with Lemon Tree — itself the offspring of Sour Diesel and Lemon Skunk — a parent known for sharp, zesty citrus terpenes and a stimulating cerebral effect. On its own, Lemon Tree can be a bit electric for some growers' tastes. That's where Geist OG enters the picture, bringing OG Kush-family structure and a calming physical dimension that rounds out the overall effect.

After several generations of selective crossing, the result is a 70/30 indica-dominant hybrid that keeps the lemon punch of its sativa side while the indica genetics contribute dense bud structure, manageable height indoors, and a well-balanced effect that works any time of day. THC levels commonly test between 18% and 26% by dry weight in dispensary analytics, with most phenotypes clustering around 20%+.

The dominant terpene here is limonene — the same compound responsible for the smell when you peel a fresh lemon. According to a review published in PMC, limonene has been studied for neuroprotective potential in both preclinical and clinical contexts (PMC8348102). A separate review in PMC noted that terpenes including limonene have been investigated for their role in inflammatory conditions (PMC8414653). None of this means your seeds will cure anything — but it does mean the terpene profile is genuinely interesting from a phytochemistry standpoint.

Growing Lemon Citron Indoors: Yield and Training

Lemon Citron grows fast for a photoperiod variety — noticeably faster than many strains in the same indica-dominant category. She's a strong choice if you're stepping up from autoflowers and want something that still moves at pace but gives you control over veg time.

Indoors, left to her own devices, she'll push one dominant central cola with multiple smaller bud sites branching off. That's fine if you're growing in a small tent and want simplicity. But if you're after a more even canopy and consistently sized flowers, topping and low-stress training (LST) will pay off. We'd recommend topping once during veg and then using ties or a SCROG net to spread the branches — you'll expose more bud sites to direct light and push closer to that 600 g/m2 ceiling.

One honest heads-up: this plant is hungry. The description from Humboldt specifically notes she requires a lot of nutrients to maintain her explosive growth rate. If you're running organic soil, top-dress with amendments (worm castings, bat guano, kelp meal) every 2-3 weeks during veg. In coco or hydro, keep your EC on the higher side of your nutrient manufacturer's feeding chart — she can handle it. Underfeeding shows up fast as pale lower leaves and slowed stretch.

Expect 450-600 g/m2 after a flowering time of 63-65 days. That's quick. For comparison, many OG Kush-family strains take 8-10 weeks in flower. Lemon Citron shaves a week off, which adds up if you're running multiple cycles per year.

Growing Lemon Citron Outdoors: Height and Support

Outdoors is where Lemon Citron really stretches her legs — literally. Plants can reach 3-4 metres tall in a full season with direct sun and good soil. That's proper tree territory, and you'll want to plan for it.

Erect a trellis or bamboo support structure early. Once those branches start loading up with dense, resinous buds in late flower, they get heavy. Without support, you risk snapped branches — and losing a cola the size of your forearm to a windy afternoon in October is not a lesson you want to learn twice.

The lemon terpene profile means she'll be aromatic outdoors. If discretion matters, this isn't your most subtle option. The smell is sharp, citrusy, and carries. Factor that into your site selection.

Lemon Citron Flavour and Terpene Profile

This is where Lemon Citron earns its name. Crack open a cured bud and you get an immediate hit of fresh lemon zest — not candy lemon, not cleaning product lemon, but actual citrus peel. There's a slightly sweet, almost creamy undertone beneath the tartness, likely inherited from the Geist OG side, which stops it from being one-dimensional.

When smoked or vaporised, the inhale is tangy and bright, with a smooth exhale that leaves a citrus coating on the palate. If you've grown Lemon Skunk or Lemon Haze before, imagine that sharpness but denser, with more body to the smoke. The limonene content is high enough that you can smell it on your fingers after handling the buds.

According to a review in Frontiers in Pharmacology, the terpene myrcene — also present in many cannabis cultivars — has been studied for anti-inflammatory effects in human chondrocytes (PMC11085560). And research into the broader terpene-cannabinoid interaction, sometimes called the entourage effect, suggests these aromatic compounds may modulate the overall experience beyond THC alone (PMC3165946). The science is still catching up, but the nose knows — Lemon Citron smells like something special.

Lemon Citron vs Other Lemon Strains

If you're browsing lemon-flavoured genetics, you've got options. Here's how Lemon Citron stacks up against two common alternatives you might be considering.

Lemon Citron's indica dominance is the key differentiator. If you want lemon flavour without a racing, purely cerebral effect, this is the better pick. The Geist OG genetics bring structure and calm that Lemon Haze simply doesn't have. On the other hand, if you specifically want a soaring sativa experience, Lemon Haze is the move — just be prepared to wait an extra week or two in flower.

Why Lemon Citron Deserves a Spot in Your Garden

There are plenty of lemon strains on the market. Most of them are sativa-leaning, slow to finish, and stretchy indoors. Lemon Citron solves all three problems. The 70/30 indica-dominant genetics keep her manageable in a tent, the 63-65 day flowering time means you're not waiting around, and yields of 450-600 g/m2 are genuinely generous for a flavour-forward cultivar.

We've seen a lot of growers get burned by "flavour strains" that taste great but produce wispy, airy buds. That's not the case here. The Geist OG backbone gives Lemon Citron dense, sticky flowers with real weight to them. She responds well to training, takes heavy feeding without flinching, and finishes with a resin production that makes her worth running through a trim bin if you're into collecting kief.

The one thing to watch: she's not a set-and-forget plant. The aggressive growth rate means she'll tell you quickly if she's underfed — yellowing lower leaves, stalled vertical growth, and thinner stems than you'd expect. Keep your feeding schedule tight, especially in weeks 3-5 of veg when she's putting on the most mass. Treat her right and she'll reward you with jars full of lemon-scented flowers that make the whole room smell like a citrus grove.

How to Grow Lemon Citron Seeds

1. Germinate seeds using the paper towel method or directly in a propagation plug. Maintain 24-26°C and high humidity (70-80% RH). Taproots typically emerge within 24-72 hours.
2. Transplant seedlings into their first container once the taproot is 1-2cm long. Use a light, airy medium — coco/perlite mix or a seedling-grade soil works well. Keep lights on an 18/6 schedule.
3. During vegetative growth, top the plant once above the 4th or 5th node if you plan to train. Begin LST by gently tying down branches to create an even canopy. Feed generously — Lemon Citron is a heavy feeder.
4. Switch to a 12/12 light schedule to trigger flowering. Reduce humidity to 45-55% RH to prevent mould in the dense bud sites. Continue heavy feeding through the first 4 weeks of flower, then taper nutrients in the final 2 weeks.
5. Harvest after 63-65 days of flowering when trichomes are mostly cloudy with a few amber heads. Dry in a dark room at 18-20°C and 55-60% RH for 7-10 days, then cure in glass jars for at least 2 weeks.
6. For outdoor grows, plant out after the last frost. Erect trellis support by mid-veg — plants can reach 3-4 metres and will need structural help once buds develop weight.

Frequently Asked Questions

Last updated: April 2026