{"id":30292,"date":"2026-03-28T00:22:24","date_gmt":"2026-03-27T22:22:24","guid":{"rendered":"https:\/\/00seeds.com\/?p=30292"},"modified":"2026-03-28T00:22:25","modified_gmt":"2026-03-27T22:22:25","slug":"guia-cultivar-cannabis-desde-semilla","status":"publish","type":"post","link":"https:\/\/00seeds.com\/en\/2026\/03\/28\/guia-cultivar-cannabis-desde-semilla\/","title":{"rendered":"How to Grow Cannabis from Seed: Complete Guide 2026"},"content":{"rendered":"

Editor\u2019s note:<\/strong> This guide is updated every season. Each section links to more detailed articles \u2014 use it as a guide to all the information on the 00 Seeds blog.<\/p>\n\n\n\n

Table of contents<\/strong><\/p>\n\n\n\n

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  1. Choosing your seeds<\/a><\/li>\n\n\n\n
  2. Germination<\/a><\/li>\n\n\n\n
  3. Indoor growing<\/a><\/li>\n\n\n\n
  4. Outdoor cultivation in Spain<\/a><\/li>\n\n\n\n
  5. Advanced techniques<\/a><\/li>\n\n\n\n
  6. Nutrition and irrigation<\/a><\/li>\n\n\n\n
  7. Common problems<\/a><\/li>\n\n\n\n
  8. Harvesting and curing<\/a><\/li>\n<\/ol>\n\n\n\n

    Growing cannabis from seed is one of the most rewarding experiences a plant lover can have. It can also be frustrating if you start without a clear roadmap. This guide is here to give you exactly that: a comprehensive overview of the process, from choosing the seed to storing the cured buds in a glass jar.<\/p>\n\n\n\n

    This isn\u2019t an article to read in one go. It\u2019s a guide. Each section gives you the essential information and links you to articles where we explore each topic in much greater depth. Bookmark it and come back whenever you need to.<\/p>\n\n\n\n

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    1. Choosing your seeds: the most important decision<\/h2>\n\n\n\n

    Every crop begins with the choice of seed. And this is where you can make or break an entire harvest before you\u2019ve even planted a single seed. The market offers three main formats, each with its own advantages and ideal grower profile.<\/p>\n\n\n\n

    Autoflowering seeds<\/h3>\n\n\n\n

    They flower on their own, without being dependent on the photoperiod. You don\u2019t need to change the light cycle; they complete their cycle in 60\u201380 days from germination and are perfect for novice growers or anyone who wants several harvests a year. The downside: there is less scope for aggressive training techniques, and the yield per plant is lower than that of feminised strains.<\/p>\n\n\n\n

    \u2192 See all the Autoflowering seeds from 00 Seeds<\/a><\/p>\n\n\n\n

    Feminised seeds<\/h3>\n\n\n\n

    They produce only female plants (those that produce buds). They are the standard choice for controlled indoor grows and for outdoor growing when you want to maximise yield. They require a switch to a 12\/12 photoperiod to induce flowering indoors, and rely on natural light cycles outdoors.<\/p>\n\n\n\n

    \u2192 See all the feminised seeds from 00 Seeds<\/a><\/p>\n\n\n\n

    Fast Version<\/h3>\n\n\n\n

    An improved version of the classic feminised strains: they retain the potency and yield of photoperiod strains but reduce the flowering time by 1\u20133 weeks. Ideal for outdoor growing in climates where autumn arrives early.<\/p>\n\n\n\n

    \u2192 View special collections<\/a><\/p>\n\n\n\n

    \ud83d\udcd6 Related article:<\/strong> Automatic vs Feminised vs Fast Seeds: Which one to choose in 2026?<\/a> <\/p>\n\n\n\n

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    2. Germination: from seed to seedling<\/h2>\n\n\n\n

    A cannabis seed that has been stored correctly has a germination rate of over 90 %. The problem is almost never with the seed itself: it lies with the method or the conditions.<\/p>\n\n\n\n

    The kitchen roll method (the most reliable)<\/h3>\n\n\n\n
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    1. Moisten two sheets of kitchen paper with settled tap water (without active chlorine).<\/li>\n\n\n\n
    2. Place the seeds between the sheets of paper, inside a covered dish.<\/li>\n\n\n\n
    3. Keep it between 22 and 26 \u00b0C. You\u2019ll see the radicle within 24\u201372 hours.<\/li>\n\n\n\n
    4. Repot when the root tip is 1\u20132 cm long, taking care not to touch it.<\/li>\n<\/ol>\n\n\n\n

      Temperature and humidity during germination<\/h3>\n\n\n\n

      The optimum temperature is between 22\u201326 \u00b0C. Below 18 \u00b0C, the process slows down or stops. The ambient humidity must be high (70\u201380 %) for the first few days. A cheap plastic propagator works perfectly for this.<\/p>\n\n\n\n

      First transplant<\/h3>\n\n\n\n

      Once the seedling\u2019s first pair of cotyledons are fully open, it is ready for its first permanent repotting (or into a 0.5-litre pot if you are going to carry out several stages of repotting). Use a light, well-aerated growing medium with a low nutrient content.<\/p>\n\n\n\n

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      3. Indoor growing: total control of the environment<\/h2>\n\n\n\n

      Growing indoors means you have complete control over everything: light, temperature, humidity, CO\u2082, and nutrients. That\u2019s a huge advantage, but it\u2019s also a responsibility. A mistake with any of these parameters will cost you in terms of yield or quality.<\/p>\n\n\n\n

      Lighting<\/h3>\n\n\n\n

      Light is the most critical factor in indoor growing. There are three main options:<\/p>\n\n\n\n