1. October 28, 2019


    Five Ways to Help Your Plants This Winter

    As temperatures drop, it’s time to start thinking about how you’ll keep your grow room, and more importantly your plants, warm this winter. A cold snap can seriously damage and at times even kill your plants. Prepare your grow room and your setup, and you’ll minimise the negative side effects of winter chills. To make it even easier for you this winter, we've taken off 10% from everything in our Seasonal Selection - the discount will automatically be deducted at check out.

    Monitor Temperatures

    While your lights are on, you should be ideally looking to keep your room temperature between 25°C - 28°C, falling to a range of 18°C-21°C while your lights are off. When thinking about your room temperature, consider setting your "Lights On" period for during the night, when the room will naturally be the coolest, and your "Lights Off" period for during the day.

    You should always keep a keen eye on the temperatures your grow room is reaching so you can act accordingly, but in the winter it's more important than ever. Installing a classic wall-mounted analogue thermometer (also available with a push button min/max option) is a cheap and easy way of giving yourself that constant reminder.

    Digital thermometers are a

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  2. September 27, 2019


    Identifying and Treating Grow Room Pests

    It's likely that however well you run your grow room, at some point, you'll have to deal with grow room pests. Pest sprays and insecticides can be worth looking into for severe infestations, but in many cases, it’s possible to use a natural biological control (predators) to get rid of your pests and return your plants to health. 

    The first step to treating your grow room pests is to identify which pest is plaguing your plants. In our experience, the most common pests are Red Spider Mite, Thrips, Sciarid Fly (Fungus Gnats) and Aphids. We’ve put together a guide on how to identify the various pests you may come into contact with, and how to treat them. 

    Red Spider Mite - Tetranychus Urticae

    How Do I Know if I Have Red Spider Mite? 

    Spider Mites are really small insects which grow to around 1mm in size. Spider Mites thrive in warm environments with low-to-medium humidity, and have a short reproductive cycle. From egg to adult takes about 14 days at 21°C, and less than a week at 30°C.

    Using a magnifying loupe will help you to see them a little clearer. With a smart phone, you can see this with our Phone Scope.

    The first signs of a spider mite infection is leaf damage, a fine pale mottling on the upper leaf surface. The u

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  3. September 10, 2019


    How to Dechlorinate Your Water 

    When you’re watering your plants, it may be tempting to reach for the kitchen or garden tap and use straight unfiltered tap water. Unfortunately, the various elements in tap water will interfere with your plants’ absorption of nutrients and supplements, and stunt your potential growth and yield. Using fresh tap water on your soil or growing media will kill a number of microbes in the root zone, primarily throughout the top ⅓ of your pot and your surface area.

    The most common problem you’ll encounter with tap water is the chlorine present. Plants are able to absorb chlorine, but they only need very minimal quantities, and you shouldn’t ever need to add any. Watering or irrigating with tap water will over chlorinate your plants. Over chlorination will result in reduced growth and yields. On average, tap water in the UK has a 0.5mg/l of chlorine. Water companies attempt to meet this standard, but it can vary slightly either way, up to around 1mg/l.

    In addition to chlorine, tap water also contains chloramines. Chloramines can be even more damaging to your plantlife than chlorine. Chloramines are typically used as water sanitizers, and contain chemical compounds of chlorine and ammonia.

    What Are Your Options?

    Allow Your Chlorine to Evaporate Naturally

    While it may not be the quickest or most exact method, if you leave your water (either in a bucket or a tub) uncovered and in a well ventilated area, the chlorine will evaporate over time. The time needed for this method to be effective will be entirely dependent on the size of your receptacle and the amoun

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  4. January 15, 2019


    VPD - Vapour Pressure Deficit

    As implied by the word "deficit" we're talking about the difference between the theoretical pressure exerted by water vapour held in saturated air (100% RH at a given temperature) and the pressure exerted by the water vapour that is actually held in the air being measured at the same given temperature.

    In essence, it is the consequence of the imbalance between temperature and relative humidity.

    ⬇︎LOW Humidity + ⬆︎ HIGH Temperature = as air warms it expands and has the ability to hold more water

    ⬆︎HIGH Humidity + ⬇︎LOW Temperature = as air cools and contracts vapour concentrates and can fall or condense out of the air as water

    Temperature control and humidity maintenance are essential for the prevention of VPD. There are several ways to monitor your grow room and ensure these optimal levels (see table) are maintained.

    To learn more about humidity, check out our humidity blog -

    There are several products you can get to manage your humidity levels.

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  5. November 29, 2018



    As the temperatures drop, your plants will need extra warmth. Cold damage is not always easy to spot, and many growers may misdiagnose it as a disease or deficiency. The most common cause is temperatures falling overnight, inflicting mild cold injuries on sensitive plants.

    What happens

    As the lights in your room go off the temperature in you grow room can plummet, this is bad on many levels.

    1  The heat in you room drops significantly and quickly this shocks your plants and can stop them feeding losing yield.  Temperature of your grow room over night or when lights are off is also crucial for when lights go back on, humidity can increase due to the quick increase of temperatures and your plants don’t start feeding straight away as the root ball is so cold this loses you time and yield. 



    2  humidity in your grow room will also shoot up.  If you are in flower when this happens it could give you problems with Botrytis also known as bud rot causing you to lose yield.   

     Plant deficiencies can be mistaken for cold temps, this is a night mare as you could end up spending money on products that you don’t need trying to fix a problem that could be fixed by buying the correct equipment

    Cold Damage Symptoms include:

    • Wilting
    • Leaf curling
    • Discolouration
    • Damaged spots

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  6. October 16, 2018


    How to Clone a Plant

    Shop Rooting Hormones & Propagation additives

    To Clone using Rockwool

    Shop Rockwool now

    To Clone using soil

    Shop Soil now

    To Clone using Water

    To Shop pH management

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  7. September 18, 2018


    Humidity: the wetter the better?

    Humidity has a huge impact on plant growth, the guttation seen here as droplets on the tips of this leaf are a visible indication of an excessively high (night-time) humidity

    There are many aspects to the environment that you can play a part in controlling. Temperature is usually always the first on people’s minds, we can feel heat so naturally it becomes quite a significant factor to us humanoids. If you hadn’t already guessed from the title of this blog, the second parameter on the hypothetical list should be humidity. The amount of water in the air doesn’t really impact people very much (other than say give us a tickly cough or make us overly sweaty) but for a plant it is a completely different kettle of fish.

    Understanding your humidity means not just understanding humidity on its lonesome though. It is intricately linked to temperature and has multiple impacts on plant growth, so it takes a small amount of getting your head around to properly understand, but once you have the basics it will help you out leaps and bounds down the line.

    So, what is humidity

    Quite simply, it is the amount of water in the air. Strictly speaking, ‘Relative Humidity (RH)’ is what a grower measures though, and by relative we don’t mean uncle dickhead who turns up to ruin Christmas. The ‘relative’ bit is referring to temperature. The warmer the temperature of the air, the more water it can hold. What does this mean though? Well, imagine you had a sealed grow room that was 20°C, with a relative

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  8. June 18, 2018


    Temperature in the Grow Room: Man’s not hot!

    Us humans deal with hot temperatures differently to that of our plant friends

    Temperature is THE most important thing for your indoor grow room. Underestimate temperature issues or do not adequately control your temperature throughout your grow, and you will never achieve the record-breaking yield of your dreams. One or two extra degrees of heat during warm days, too cold a night time temperature, or even too great a swing in your day/night temperature difference all play a direct part in adding to your yield. Getting them right will see more of an addition to your yields than any bottle of nutrient can give you; quick maths.

    Understanding how temperature impacts your plants and understanding how you can steer your growth by controlling grow room temperatures will quickly set you on the path to becoming a hydroponic god. This blog is a quick insight into temperature and a few pointers about the sort of equipment you can use to control it all. So, without further ado, let’s get cracking!

    What temperature does

    There are two key things that temperature impacts a plant with; its metabolic rate and its cooling capacity, which are essentially at constant logger-heads.

    Your plant needs heat to maintain a healthy metabolism. Eve

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  9. March 27, 2018


    Solistek: Let There Be Light!

    We syphon through lots of products before deciding whether they are worth putting on our shelves. There’s no point stocking products just for the sake of it, there has got to be something special about them if they want our backing! 

    Check out this little bit of info on these new, remotely controlled Solis Tek ballasts.

    If you are in the market for a new grow light, then you couldn’t really be in much of a better position. There are a huge range of companies now on the market so the choice for you as a grower is pretty phenomenal. If you do need to resort to a cheap hydroponic grow light, then of course that option is there, but you really are missing out considering the how awesome the high end grow lights are now. With ridiculous outputs, wide ranging spectrums and diverse functionalities, Solis Tek products are the perfect example of a good quality grow light that deserves a rightful spot in your grow room.

    The SolisTek Matrix Digital Ballast - Packed full of functionality!

    She’s a looker

    So, the first thing that might strike you when you gaze upon the Solis Tek Matrix ballast, is just how god damn sexy it is. With its sleek black metal finish and curvaceous cooling fins, it really does look the part. It is not merely style over subst

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  10. December 20, 2017


    Viva la Revolution!

    There are a few special times in a lifetime, when something comes along and genuinely makes you double take in awe. The Revolution Deva 1000w DE HPS grow light is precisely one of those products!

    We take looking for new products VERY seriously here at Greenspirit Hydroponics. Sometimes it be a little overwhelming for a grower to cut through the marketing jive, as every product is usually claimed to be the best thing since sliced bread. We take pride in cutting through the chaff to make sure you only get products that genuinely do the job, and do it well!

    The new 1000w double ended HPS fixture from Revolution Micro, is one product that immediately caught our eye. Why? Well firstly, it looks dead sexy, that usually helps! Secondly, it genuinely has unique features that set it apart from the competition. Thirdly, once we had tested it we were literally blown away at how well it works!

    Aptly titled

    Yes, it does sound a bit cheesy, but it really is a revolution for an indoor grower. Although, double ended lamps aren’t necessarily much of a new thing anymore, the rest of the technology that makes up the DEva is really what makes it shine. Rather than having been developed for huge, high bay greenhouse installations where a completely different set of principles are required, the Revolution DEva has been designed specifically with the indoor hydroponic grower in mind.


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