The specs in one line: 18-22% THC, <1% CBD, 7-8 weeks flowering, 450-500g/m² reported. Best indoor or outdoor. moderate grow.

Royal Queen Seeds lists this at $28.19 — above the median of $26.24 across 12 listings. Pack options: 3-seed at $28.19, 5-seed at $42.77, plus larger sizes.

Smell-first impressions matter in this hobby, and cracking a jar of this one tends to stop people mid-sentence — the fruity, earthy aroma reads closer to fresh rind than anything artificial. Watermelon is a feminized indica traced back to Watermelon OG S1, and Royal Queen Seeds spent real development time refining it rather than rushing a release. THC lands between 18–22%, which puts it firmly in the upper-mid range without crossing into difficult-to-dose territory. Flowering wraps up in 7–8 weeks, and growers working a managed 1m² setup can realistically pull 450–500g under decent light.

Difficulty sits at moderate — not a beginner trap, but nothing that demands advanced training techniques either. It performs in both indoor and outdoor environments, which gives you some flexibility depending on your setup.

A solid pick for indica lovers who want reliable yield numbers and a flavor profile that actually lives up to the name.

Genetics & Lineage

Watermelon traces its genetics to Watermelon OG S1. This indica-dominant feminized seed produces plants that express the best traits of its parent lineage, delivering consistent results for growers of all experience levels. Bred by Royal Queen Seeds, each seed is selected for genetic stability, terpene expression, and vigor.

Effects & Experience

Users report primarily relaxed and sleepy effects, making this strain ideal for evening use and unwinding after a long day. The body-centered stone builds gradually, easing tension and promoting deep physical relaxation. With THC levels reaching 22%, this offers a well-balanced experience suitable for most users with some cannabis familiarity.

THC Level & Potency

Watermelon delivers THC levels of 18-22%, placing it in the moderate-to-strong range that most regular consumers find comfortable. CBD content is minimal, so the psychoactive effects are front and center. The onset typically arrives within 5-10 minutes, settling into the body as a warm, heavy relaxation.

Growing Watermelon

Watermelon is rated as moderate difficulty, making it suitable for growers with some experience. Basic knowledge of nutrient schedules, pH management, and environmental controls will help maximize results.

Indoor Growing: Expect a flowering time of 7-8 weeks with yields of 450-500g/m². Plants typically reach 80-130cm indoors. Standard training techniques like topping and LST will help manage height and improve light penetration. Maintain temperatures between 68-80°F with relative humidity around 40-50% during flowering.

Outdoor Growing: This versatile strain performs well in both indoor and outdoor environments. Outdoor growers in warm climates can expect harvest from late September through October. Watch for humidity during late flowering to prevent bud rot, especially with dense flower formations.

Flavor, Aroma & Terpene Profile

Watermelon features a fruity, earthy terpene profile that develops complexity throughout the flowering cycle. Sweet berry and grape notes dominate the inhale, with a sugary exhale that lingers on the palate. The aroma intensifies significantly during the final 2-3 weeks of flowering — carbon filtration is recommended for indoor grows requiring discretion.

Medical Benefits

While individual experiences vary, Watermelon is commonly reported to help with stress relief, chronic pain, insomnia, and muscle tension. The deeply relaxing effects make it a popular choice among medical users seeking nighttime relief. As with any cannabis strain, start with a low dose and increase gradually. Consult a healthcare professional before using cannabis for medical purposes.

Who Should Grow Watermelon ?

This strain is ideal for intermediate growers ready to push their skills and be rewarded with superior results. If you're looking for evening relaxation and deep stress relief, this is your strain.

Why Buy Watermelon from Seennabis?

When you purchase Watermelon through Seennabis, you are buying directly from Royal Queen Seeds — One of Europe's largest and most trusted seed banks, founded in Amsterdam in 2008. Every order includes verified genetics, discreet shipping, and responsive seller support. Royal Queen Seeds has completed over 257 sales.