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In Czech shops, it is not difficult to come across “legal” cannabis substitutes. These may take the form of pre-rolled joints, vape pens, cannabis trim, hashish, various extracts, or even sweets. Their manufacturers promise effects similar to classic cannabis and try to attract customers with the fact that their goods are freely available. In reality, science still knows very little about many of these substances, and they can seriously endanger consumers’ health and lives. Where did synthetic cannabis substitutes come from, and what risks do they involve? The effects of cannabis are due to ca...

Were you surprised by the strength of the strain, or did you eat too many brownies? For the unprepared, consuming a larger amount of THC can be a very unpleasant experience. The good news is that serious health complications after cannabis consumption are extremely rare, and in the vast majority of cases the effects wear off on their own within a few dozen minutes or a few hours. The truth, however, is that the affected person may feel that this period lasts much longer than is comfortable. HiSeeds brings you a guide on how to handle being too high calmly and safely. Although serious health co...

“Marijuana seeds selected from first-class marijuana from around the world. Durban poison, Nigeria, Sumatra, Thailand and more. 4 for $1. Discounts on larger orders.” Order now and send $2 for postage and a seed catalogue. Discretion guaranteed.” These few lines published in July 1984 in High Times magazine changed the world of cannabis forever. Their author was Nevil Schoenmakers, a cannabis grower and breeder living in Holland, whom many consider the spiritual father of modern seed banks. Holland in the 1980s was, thanks to its tolerant drug laws, a refuge for members of the underground from...

Spring is here and you have still not remembered that it is time to germinate, let alone pre-grow seedlings for outdoor planting? It can happen to anyone, but it would be a shame to miss the whole season because of a few weeks. At HiSeeds, we have the solution! We have selected five reliable fast strains from our catalogue, from which you will harvest a rocket, even if you order them only today. How long does it take to grow cannabis? The answer to this question will vary depending on which strain you decide to grow. The shortest life cycle is found in autoflower (self-flowering) strains, the ...

Quality genetics are a treasure – and anyone who has ever lost a favourite strain knows how valuable cannabis seeds can be. Whether you are building your own collection or simply postponing germination until the next season, we will show you how to store seeds so they survive for many years without harm. The oldest seed ever successfully germinated was a date palm seed found during excavations at the palace of Herod the Great. From a seed buried thousands of years under the sand, a healthy tree grew, and its pollen was used to pollinate other date palms. This discovery proves how resilient see...

Have you bought from HiSeeds and do not want to make any mistakes during germination? Simply follow a few basic rules and avoid the most common errors. We have prepared answers to the ten most frequently asked questions about cannabis germination for you. In the following lines, we answer the most common questions about germination in detail. If you are looking for a complete guide to cannabis germination, you will find it on our blog here. 1. Which germination method is best: paper towel, water, or straight into the substrate? There are several methods for germinating cannabis seeds. Germinat...

Every year on 20 April, all over the world, in parks, at festivals, or simply in living rooms, people gather to pay tribute to a holiday that has no place in official calendars. The date refers to the numbers 4/20, which have been associated with cannabis for decades. Why this combination of numbers? If you asked a random passer-by where the 4/20 tradition came from, the answer would probably be along the lines of it being a police code for marijuana or Bob Marley’s favourite number. Both are complete myths, and we should add that 420 is also the call sign for the Czech Republic, long the most...

From 1 January 2026, you will be able to legally grow cannabis seeds purchased from HiSeeds. However, to avoid getting into conflict with the law, you must follow several rules. We will explain how to legally grow cannabis with a high THC content. Warning: This article is for informational purposes only and does not encourage anyone to break the law or consume narcotic substances. We are not lawyers and do not provide legal advice. Before taking any action, check the valid and current wording of the regulations in the official Collection of Laws or consult a solicitor. Only the relevant author...

Spring is approaching, it is time to germinate, but you do not have a piece of your own garden where you could grow? You do not need to despair. Try growing balcony plants. Even on a small balcony or terrace, you can grow a beautiful harvest. You only need to choose the right strain. Before you start buying seeds, bear in mind that not every balcony or terrace is suitable for growing cannabis. The plants need at least several hours of direct sunlight every day. If your balcony or terrace is sunk in shade, cannabis will survive, but the plants will be weak, grow slowly and the yield from them w...

Few growers do not know that, with the exception of autoflowering varieties, cannabis flowering depends on photoperiod, that is, the length of day and night. A less well-known fact is that behind plant photoperiodism lies a sophisticated system that can be as precise as clockwork. How do plants know whether it is day or night outside, and according to what do they regulate flowering?  Unlike us humans, who only need to look at the sky, plants regulate their internal clocks according to receptors in the leaves called phytochromes. Depending on whether, and what kind of, light shines on th...

Dividing cannabis strains solely into indica and sativa no longer corresponds to the scientific understanding we have of this plant. The effect of cannabis is closely related to its terpene content, the aromatic compounds that create its typical aroma. The scent of the cannabis plant can therefore tell us more about its effects than its genetic origin. Although all cannabis plants are genetically related and belong to one species, we commonly speak of different varieties or strains. These differ from one another in appearance, growth rate or flowering time, as well as in chemical composition. ...

Few European cities are as closely associated with cannabis culture as Amsterdam. For decades, the Dutch capital has been home to dozens, even hundreds, of coffeeshops where you can “legally” buy cannabis. It is no surprise that Amsterdam has become a Mecca for lovers of green smoke from all over the world, and that some of the most celebrated seed banks and strains come from here. Which Dutch genetics does HiSeeds consider the best? Some readers may ask us whether old-school strains can stand up to modern Cali Weed or F1 seeds. Although tastes in cannabis have changed since the 1980s and 1990...

There may be many reasons to grow cannabis, but most people embark on this noble activity for the unique compounds contained in this plant. The best known and most sought-after are undoubtedly cannabinoids, but they are far from the only ones. What are the most important substances in cannabis, and what does science say about them? To date, more than 500 compounds have been identified in cannabis – including more than a hundred phytocannabinoids (cannabinoids of natural origin), over one hundred different terpenes, more than thirty flavonoids, phenols, alkaloids and other substances. Different...

Many growers make one fundamental mistake when choosing cannabis seeds for outdoor cultivation – they select a variety because of its well-known name and do not consider whether it is suitable for growing in our climate. Usually, the harvest then does not have time to ripen before the first frosts, or they do not get a harvest at all because the plants fall victim to pests and mould. What is the best cannabis variety for outdoor growing? It is not possible to choose just one – there are many cultivars suitable for the Czech climate. The ideal cannabis variety for a Czech grower must flower rel...

Few people today doubt the medicinal power of cannabis. In shops, you can buy cannabis ointment for sore joints, CBD oil for a good night’s sleep, and those who wish can ask a doctor for prescription cannabis. But is cannabis really as medicinal as many people believe? The truth is that many myths and half-truths circulate in public discourse, and at HiSeeds we have decided to set the record straight. So what does current science say about the medicinal power of cannabis? Before we look in detail at the evidence for the medicinal properties of cannabis, let us first explain what lies behind th...

Czech law allows you to legally grow up to three plants at home and to possess no more than 100 grams of dried cannabis in the household at any one time. It is understandable that many beginner growers ask how much cannabis they can harvest from one plant. The truth is that the answer is nowhere near as simple as legislators might imagine. Cannabis is an incredibly versatile species, and the differences in harvest between individual plants can be enormous. It depends on the strain, the growing style, the conditions and many other factors. It stands to reason that plant size will be one of the ...