Watermelon cannabis seeds are fruity, terpene-loaded strains built around that sweet melon-candy flavour profile — and we carry 17 of them, from Pyramid's original Watermelon Zkittlez to Barney's Farm autos and DNA Genetics' Watermelon Man. Indica-dominant hybrids dominate the shelf, with photoperiod and autoflower options across feminised packs. Shipping across the EU since 1999.
Buy Watermelon Cannabis Seeds — Strain Guide & Buying Advice
Watermelon seeds are a family of fruit-forward cannabis strains bred for sweet, candy-like terpene profiles and (mostly) indica-leaning effects. The watermelon line traces back to Watermelon Zkittlez — that's the genetic spine running through almost everything in this category. Cross it with Gelato, Wedding Cake, Runtz, Purple Punch, OG Kush or ruderalis and you get a different expression each time, but the melon-candy nose stays put.
We carry 17 watermelon-themed seeds from breeders like Barney's Farm, Royal Queen Seeds, Pyramid Seeds, Growers Choice, Silent Seeds, DNA Genetics, Advanced Seeds and Pure Instinto. Photoperiod feminised packs, autoflowers, balanced 50/50 hybrids, heavy 70/30 indicas — the breadth is here, you just need to know which version suits your grow.
Watermelon Strain Comparison
Quick orientation — the easiest way to choose is by grow style first, then by THC and yield. Autos finish faster and stay shorter; photoperiods give you bigger plants and bigger headline numbers.
| Strain | Type | THC | Flowering | Good for |
|---|---|---|---|---|
| Watermelon Zkittlez (Pyramid) | Photo, 50/50 | ~22% | 60 days | Outdoor growers chasing 1kg/plant |
| Watermelon Zkittlez (Barney's Farm) | Photo, indica-lean | High | 9 weeks | Resin hunters who want a known breeder |
| Watermelon Zkittlez Auto (Barney's) | Auto | High | 70 days seed-to-harvest | First-time auto growers |
| Watermelon Punch | Photo, 70% indica | Up to 28% | 8–9 weeks | Beginners who want a forgiving plant |
| Watermelon Gelato | Photo, indica-dom | 18–24% | Standard | Evening smokers, terpene chasers |
| Watermelon Gelato Auto | Auto | 20–25% | 8–10 weeks | Fast-cycle indoor growers |
| Watermelon Weddingcake | Photo, 70/30 indica | 25–30% | 9 weeks | Experienced growers, high-THC seekers |
| Watermelon Runtz | Photo, indica-dom | 22% | 65 days | Outdoor monsters — up to 1.4kg/plant |
| Watermelon (RQS Auto) | Auto | Mid | 8–9 weeks | Small tents, quick turnover |
| Watermelon OG / Auto OG | Photo & Auto, 50/50 | Mid–high | 60–70 days | Balanced effect, purple buds |
| Watermelon Man | Auto | Mid | 60–70 days | Compact stealth grows |
What We Carry
- Original Watermelon Zkittlez lineages — Pyramid Seeds (the originator), Barney's Farm, and Pure Instinto each have their own cut. Pyramid's is the 50/50 hybrid most growers know.
- Watermelon × Gelato crosses — Watermelon Gelato and Watermelon Gelato Auto bring in Gelato 45 for that dessert-strain finish.
- Watermelon × Wedding Cake / Punch / Runtz — modern American hybrids from Growers Choice and Silent Seeds, pushing THC into the 25–30% range.
- Watermelon OG family — Advanced Seeds' Melon Purple × Black OG line, photo and auto, known for purple-tinted buds.
- Autoflowers across the board — Barney's, RQS, DNA Genetics' Watermelon Man, and Advanced Seeds' Auto Watermelon OG. Pick these if you've got limited time or limited light control.
How to Choose Your Watermelon Seeds
If you're new to growing, get Watermelon Punch from Growers Choice or Watermelon Zkittlez Auto from Barney's Farm. Both are mould-resistant, light feeders, and won't punish you for missing a watering. Order a 3-pack, not 10 — you don't need a stockpile while you're learning.
Intermediate growers who want flavour over headline THC should shop the Pyramid Seeds Watermelon Zkittlez or Royal Queen Seeds' Watermelon (the photoperiod indica from the Watermelon OG S1 cut). Both reward proper feeding schedules with serious terpene density.
Chasing big numbers? Watermelon Weddingcake (25–30% THC) and Watermelon Runtz (1.4kg per plant outdoors) are the heavy hitters. These want experience — feeding, training, and timing all matter more on high-yielding photoperiods. When in doubt, start with Watermelon Punch and graduate from there.
Frequently Asked Questions
What does watermelon cannabis actually taste like?
Sweet, candy-like, with a fruity-floral nose — closer to watermelon-flavoured sweets than fresh fruit. Most strains in this family layer berry, gelato, or kush notes underneath depending on the cross. Pyramid's Watermelon Zkittlez and Barney's Farm version are the most "true to name".
Are watermelon seeds beginner-friendly?
Most are, yes. Watermelon Punch and the Watermelon Zkittlez Auto from Barney's Farm are mould-resistant, light feeders, and forgiving of mistakes. Skip Watermelon Weddingcake until your second or third grow — high-THC photoperiods want proper feeding and training.
Should I buy autoflower or photoperiod watermelon seeds?
Autoflower if you want a fast 8–10 week cycle, a compact plant, or you can't control your light schedule. Photoperiod if you want bigger yields (up to 1.4kg per plant outdoors with Watermelon Runtz) and don't mind the longer veg phase.
Which watermelon strain has the highest THC?
Watermelon Weddingcake from Growers Choice tops the range at 25–30% THC, followed by Watermelon Punch and Pure Instinto's Watermelon Zkittlez at up to 28%. Auto Watermelon Gelato hits 20–25% if you want fast and strong.
What's the difference between the three Watermelon Zkittlez seeds you sell?
Pyramid Seeds is the original breeder — true 50/50 hybrid. Barney's Farm offers their own indica-leaning version plus an autoflower. Pure Instinto's is feminised, US-genetics, and pushes towards 28% THC. Same name, three different expressions.
How long do watermelon seeds take to grow?
Autoflowers finish in 8–10 weeks seed-to-harvest (Barney's Watermelon Zkittlez Auto, Watermelon Gelato Auto). Photoperiods need a separate veg stage plus 8–9 weeks of flowering — Watermelon Punch and Weddingcake both wrap flower in around 9 weeks indoors.
Last updated: April 2026