When to Plant Cannabis Seeds UK (Month-by-Month Guide 2026)

 

When to Plant Cannabis Seeds UK (Month-by-Month Guide 2026)

Timing is everything when growing cannabis outdoors in the UK. Due to the unpredictable weather, short summers, and early autumn rain, planting at the right time can make the difference between a successful harvest and crop failure.

At Discount Cannabis Seeds, we always recommend planning your grow around the UK climate to get the best results.

This guide explains when to plant cannabis seeds in the UK, with a simple month-by-month breakdown.

🌱 When Should You Plant Cannabis Seeds in the UK?

👉 The best time to plant cannabis seeds outdoors in the UK is:

Late April to May (ideal window)

This allows plants to:

Grow strong during summer
Flower before autumn weather hits
📅 Month-by-Month Cannabis Planting Guide (UK)
🌧️ January – February
❌ Too cold and dark
Not suitable for outdoor growing

👉 Only indoor growing possible

🌱 March
⚠️ Still too early outdoors
Can start seeds indoors

👉 Good time to prepare for the season

🌤️ April
✅ Start germinating indoors
Move plants outside late April (weather dependent)

👉 Early start gives bigger yields

☀️ May
✅ BEST time to plant outdoors
Warmer temperatures and longer days

👉 Ideal for most growers using seeds from Discount Cannabis Seeds

🌿 June
✅ Still a good time to plant
Slightly smaller plants than May

👉 Great for autoflower seeds

🌸 July
⚠️ Late for feminised seeds
✅ Fine for auto flower strains

👉 Expect smaller yields

🍂 August
❌ Too late for most grows
Only very fast auto flower strains possible
🌧️ September – October
❌ Harvest season
High risk of mould and bad weather
❄️ November – December
❌ Not suitable for growing outdoors
🇬🇧 UK Growing Timeline (Simple)
Germinate: April–May
Grow: May–July
Flower: July–September
Harvest: September–October

🌱 Autoflower vs Feminised Timing.

Auto Flower Seeds:

Can be planted later (May–July)
Faster (8–10 weeks)
More flexible

Feminised Seeds:

Must be planted earlier (April–May)
Larger plants and yields
Longer grow cycle

👉 Many UK growers use auto flower seeds from Discount Cannabis Seeds for flexibility.

💡 Tips for UK Outdoor Growing.

To improve success:

Start seeds indoors early
Choose sunny, sheltered locations
Protect from heavy rain
Use fast-growing strains
Monitor for mould in autumn.

❓ FAQs
When is the best month to plant cannabis seeds in the UK?

May is the best month for outdoor planting.

Can I plant cannabis seeds in April UK?

Yes, but it’s best to start indoors and move plants outside later.

Is June too late to plant cannabis seeds UK?

No, but yields may be smaller unless using auto flower seeds.

Can you grow cannabis outdoors in the UK?

Yes, with the right timing and strains from Discount Cannabis Seeds.

🧠 Final Thoughts.

Growing cannabis outdoors in the UK is all about timing and planning.

By choosing the right planting time and genetics from Discount Cannabis Seeds, you can:

Maximise your yield
Avoid weather risks
Achieve a successful harvest.

✍️ Author Bio

Molly Carter
Molly is a cannabis cultivation writer specialising in UK outdoor growing, seasonal planning, and strain selection. She works with Discount Cannabis Seeds to help growers achieve the best results in all conditions.