Watermelon

RQS Watermelon Cannabis Seeds

Watermelon by Royal Queen Seeds is an almost pure indica-dominant cannabis strain bred from a rare Watermelon OG S1 cut, delivering a calm, deeply relaxing stone wrapped in tropical melon aromas. With a compact structure that tops out at 80–130cm indoors and a 9–10 week flowering cycle, this cultivar punches well above its weight — up to 500g/m² under lights. We've had growers tell us it's one of the most forgiving indicas they've run, and honestly, the terp profile alone makes it worth the grow.

Why Watermelon Seeds Deserve a Spot in Your Grow

Royal Queen Seeds bred Watermelon from a Watermelon OG S1 — a selfed line that locks in the parent's best traits: dense bud structure, thick resin coverage, and that unmistakable sweet melon nose. The result is a stable, uniform cultivar that behaves predictably from seed. That matters if you're running a SOG or filling a tent with multiple plants and need them to finish at the same height and the same week.

The growth pattern is textbook indica. Thick central stem, strong lateral branches, dark green fan leaves that stack on top of each other like roof tiles. Indoors, expect 80–130cm depending on pot size and training. Outdoors, given enough root space and direct sun, Watermelon can stretch to 200cm or more. The foliage gets dense — really dense — so defoliation isn't optional, it's the difference between fat colas and mould. Strip the lower thirds, open up the interior, and let light hit those bud sites.

The honest limitation? That thick canopy is a double-edged sword. In humid climates or poorly ventilated tents, you'll need to stay on top of airflow. A clip-on fan pointed at the canopy and regular leaf tucking go a long way. We'd pick Watermelon over most indicas for a small-tent SOG — its compact, uniform structure means less wasted space — but if your environment runs above 65% RH in flower, budget for a dehumidifier or choose an outdoor spot with good breeze.

Watermelon Aroma and Flavour Profile

Crack open a cured jar of Watermelon and the first thing that hits you is ripe cantaloupe mixed with sugary watermelon rind — sweet, almost candy-like, with a damp tropical undertone that sits somewhere between mango and wet earth. On the exhale, there's a subtle herbal spice that rounds out the sweetness and stops it from being one-dimensional. The terpene profile leans heavy on fruity esters, and the resin production is generous enough that your fingers stick together after trimming. If you've grown strains like Tropicana Cookies or Zkittlez and enjoyed the fruit-forward terps, Watermelon sits in that same neighbourhood but with a distinctly melon-forward character that's harder to find.

How to Grow RQS Watermelon Seeds

1. Germinate your Watermelon seeds using the paper towel method or directly in a propagation plug. Taproots typically emerge within 24–72 hours at 22–25°C.
2. Transplant seedlings into their first pot (0.5–1L) once the taproot is 1–2cm long. Use a light, airy substrate — coco/perlite or a seedling-grade soil works well.
3. Veg for 2–4 weeks depending on your target canopy size. Watermelon vegetates quickly, so don't let it outgrow your space. Top early (above the 4th or 5th node) to encourage lateral branching and a wider canopy.
4. Defoliate aggressively before flipping to 12/12. Remove large fan leaves blocking bud sites, especially in the lower third. Repeat a light defoliation around week 3 of flower.
5. For SOG setups, skip the topping. Run untopped plants in small pots (3–5L), pack them at 4–9 plants per m², and let each one produce a single dominant cola. The uniform genetics make this approach reliable.
6. Apply LST (low-stress training) by gently bending the main stem and tying it down during veg. This opens the canopy without the recovery time that topping requires.
7. Maintain good airflow throughout flower. Watermelon's dense foliage traps moisture — a small oscillating fan and an extraction system with a carbon filter are non-negotiable indoors.
8. Harvest after 9–10 weeks of flowering. Check trichomes with a loupe: mostly cloudy with a few amber heads signals peak maturity for a full-body stone. Expect up to 500g/m² indoors with proper lighting and nutrition.

Watermelon Seeds — Grow Specifications