Double Outdoor Harvest with Grow Island's Guidance – How to Achieve Two Cannabis Harvests in One Outdoor Season

If you've ever wondered whether it's possible to harvest cannabis twice in a single outdoor season, you're in the right place! The Grow Island team is here to help you achieve exactly that—especially by using autoflower cannabis seeds specifically developed for this purpose. Northern countries like the UK and Denmark offer ideal conditions for this technique and with the right strain selection, doubling your yield becomes surprisingly attainable. In this article, we’ll share the most important tips and Grow Island's top recommended cannabis seeds to help you make the most of this growing season.

How to achieve two harvests in one outdoor season

Autoflower cannabis strains usually take about 11 weeks from seed to harvest when grown indoors. Outdoors, depending on latitude and weather, this may extend by 2–4 weeks. Thanks to their fast-growing cycle, autoflowering strains allow many growers to complete two consecutive harvests in one season. In Mediterranean climates, even a third harvest is possible in one season.

Key factors for success

• Indoor pre-germination: Many experienced growers prefer to germinate seeds indoors and raise them under LED lights for 2–3 weeks. This protects young plants during their most vulnerable stage from sudden bad weather and pests.

• Choosing resilient strains: Go for autoflowering cannabis seeds recommended by Grow Island—these have proven performance outdoors. All autos offer speed and convenience, but some are especially tolerant of extreme conditions.

• Proper site preparation: Make sure your outdoor grow spot is well-prepared and maintained. Grow Island’s expert guides will help you execute each step the right way.

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Why choose autoflowering cannabis seeds?

While autoflowering strains might not reach the massive yields of photoperiod strains, they can be cultivated quickly and repeatedly in long seasons. Their smaller size also makes them popular for outdoor growers, as they can be easily hidden among shrubs or low vegetation—ideal for discreet cultivation.

Double harvest potential with photoperiod seeds

Unless you live in an equatorial region with consistent 12-hour daylight all year, achieving two full photoperiod harvests per season is difficult. However, indoor lighting can extend the vegetative phase and supplemental lighting after sunset can also help.

Top Cannabis Seeds for 2024 Recommended by Grow Island – Dutch Passion Collection

Here are some popular autoflowering strains favored by outdoor growers:

• Auto Forbidden Cherry – A hybrid bred for outdoor growing, resistant to harsh conditions with high THC levels.

• Auto Duck – A stealthy strain with camouflage-like leaves, easy to hide from prying eyes.

• Auto Mazar – A classic with high yields and excellent weather resistance.

• Auto Euforia – Perfect for those seeking strong, top-quality outdoor cannabis.

• Auto Banana Blaze – Fast-growing and sweet-tasting, with a powerful THC punch.

Grow Island’s Tips for a Successful Double Harvest

Choose the warmest and sunniest 6 months of the year to attempt a double harvest. If your climate isn’t long enough, start seeds indoors and transplant them outdoors when the weather improves. Grow Island’s experts continuously update their tips and strain recommendations to ensure your success.

All autoflower seeds in the Grow Island collection perform well outdoors, but the strains listed above are especially popular among outdoor growers. If you're looking for a budget-friendly option, be sure to check out our current promotions.

We wish you great success with your outdoor grow and hope you achieve your double harvest with help from the Grow Island team!