Hi, I wrote a few months ago as both plants - in my very restricted height microgrow (60cm from floor to ceiling) under an SF1000 light in compost and perlite, with pH adjusted water and Biobizz nutes - were losing leaves. Fast forward to this grow. I still can't do anything about the size of my chamber and it is kind of fun but... I upgraded to Biobizz All Mix with their nutrients and kept the light to 60% brightness max. Now I have got the 2 plants to week 7 without much in the way of leaf problems apart from a little brown on one or two leaves of ONE plant. The humidity in the grow room does vary between 35% - 55% which is a little low at worst, but there's little I can do apart from make sure I keep them watered and leave a moist sponge in there. I've been using Biobizz nutes (Grow, Bloom, Topmax & Calmag) at 1/4 strength since week 3 - no pH adjustment, water pH appears to be around 7.2. I noticed a little rusty brown on one leaf - looked like potassium deficiency to me. I guess could have been light stress, but only on one plant and in the middle of the plant? First 2 weeks, I only needed to water the plants once or twice, but have slowly increased this as they went into flower and now they are drinking 500ml a day. In the last week or so, a few leaves have got brown patches and a couple have started twisting. Seemingly random locations on the plant and the other plant has no leaf damage apart from a little yellow brown at the tips. A few days ago, I wondered if I'd let the soil get too dry, it was dry down to about 7cm (the pot is only 14cm high but wide, to maximise the little height I have) but no leaves were wilting, just this dry leaf twisting on one or two fans? So maybe the twisting is a knock-on from there? The nutes don't seem to have stopped the browning and the tips are yellow to brown, which I suspect means that even at 1/4 strength, I haven't watered the plants often enough that the soil is depleted enough to need nutes at even 1/4 strength? I am including photos of both plants, though note, apart from slightly yellow leaf tips, only a couple of leaves on one plant are affected currently and this has only occurred since week 2 of flowering. I could imagine even at 50%, the 100W SF1000 at 24cm (less than the 12 inches closest for flowering at 100% power) might cause a little heat or light stress, though my hand is comfortable at leaf-top height and I don't want to turn down the light too far or prematurely as these plants only have another 3 or 4 weeks flowering to go. I will turn them down if light is the likely culprit though. I felt it looked like a pot deficiency, hence continuing with the nutrients. Could you offer any indication of what the problem might be?

Trying to find my number one strain, something that can consistently grow big tasty buds without a big loss in quality. My setup has a limited amount of vertical space and will have 240w of led in it. I don't really mind whether sativa or indica as i can train the plants. Big bud or chronic are obvious choices, or super lemon haze if i did lst, but my tent often gets cold and i don't know if a sativa could take it. i haven't grown for ages and don't know what is still good quality in 2021, and was wondering what has been reliably producing those big foot long colas for you and with decent quality cheers for any help

Hi, To cut a long story short, for now I can only get away with a microgrow under my desk. I am growing in a propagation tent 60cm tall and long and 40cm wide. My plants started off fine, but have become very yellow and burned looking and bud growth has slowed as all the fan leaves are falling off. It's way too early to be just because of flowering imho. I would have boosted nutrients, but with the burn at the tips, that'd seem like a bad choice. I've dropped the light level down by 30% as I think the light was too intense at the distance from the flowers, I've also switched to plain correct pH water for a watering as the tip burn has always meant too much in the way of nutrients in previous grow. I have insufficient experience of growing indoors and in strange circumstances like a micrgrow, to make a good judgement about what to do next. Can you tell by the photos what might be wrong? I'd really appreciate some advice before it is too late! (Much more detail below if you want it, or skip to the photos at the end...) ------------------ My circumstances and location mean that it is impossible to grow unless it is very well hidden and camouflaged. I figured I'd see if I could quietly grow indoors under my desk. I realised at the time it was a fairly big ask, with slim-pickings and problems along the way. Anyway... My plants are all turning yellow and crispy. Please see photos at the end and offer any advice you can? More Background I had to make an ultra quiet and small grow room, which I did, using a propagation tent that fits basically under my desk. It's only 60cm tall and 40cm wide. I figured if people can micro-grow in a PC case, I could grow in that. I bought 2 sets of controllable 12cm PC fans for intake and a cooker hood carbon filtered-exhaust. I have a USB deskfan clipped to an internal pole to provide breeze. Temperatures in the tent range from 22c to 29c and RH from 30% - 60%. So far, so not bad - thanks Ona gel. I would have used my rhino filtered inline fan, but on trial it was far too noisy and the filter takes up most of the upper internal portion of the propagator, where the LED light needs to be. I bought Royal Dwarf and Green-O-Matic varieties because they cover a spread of sativa / indica vibes and both stay under 60cm tall. With my fabric pots about 22cm tall and the 100W LED (SF1000) light tied to the ceiling of the tent, I had about 38cm between the pots and the light. I used a mix of about 60% compost - not enriched artificially, 20% Canna Coco Pro and 20% Perlite. I germinated the seeds with the LEDs at about 50%. I LST'd them as soon as I thought it viable, though the GOM was tough and woody from a very early stage and I was loathe to risk breaking it. In hindsight I should have probably risked lower yields and fimmed the buggers at the 4th node perhaps? Anyway, I stepped the light up, bit, by bit until it was at about 90% power. Everything went well for the first 3 weeks or so, despite a little leaf twist here and there, but on the GOM that happened with the very first set of leaves, so I thought, ho hum. Very quickly a few leaves began to show some bronze spots and yellowing / crisping. I had been pH-ing the water to about 6.5 (down from 7.8) and the run-off was about the same, so I figured it wasn't pH. Saying that, a cheap garden-centre probe records the soil pH at about 6.8. I started using some Biobizz Grow at 1/4 strength with each watering and introduced some CalMag at about 1/2 strength. our water is soft, so I figured the brown spots and crisping might be solved with that. Nope. I realised I hadn't been leaving the soil to dry out quite enough. The top inch was dry, but the Royal Dwarf still had leaves dropping down, so I have spaced watering out about 2 days more, flood and drain. The plants are off the saucers, so aren't sitting in water. The leaves are no longer drooping. However, they are getting a bit jaundiced looking. The problem continued into flowering which became noticeable by week 4. The odd leaf was easily removable and I added some Biobizz Top Max and Biobizz Bloom into the mix. The leaf tips were yellowing a touch, particularly on the Royal Dwarf, but both had more fan leaves going yellow and bronze, some at the bottom of the plant, some at the top. Skip ahead to now, around week 6 since germination and I increased the nutrient dose a little. Still only 1/2 of the recommended dose, even for Autos in a standard soil mix. However, many to most of the fan-leaves have now come off. These plants finish in 8 - 10 weeks, so I will soon be at the stage where I'd expect to see some leaves going south during mid to late stage flowering. But this would seem to be a problem. With the flowers now only 10-15 cms from the light max, I have turned the light down to about 75% as that seems a comfortable level and I figured it will reduce the chance of burning, fox-tailing and so on. I just figured that even if I was getting nute-burn (as the tips suggest I am) then the variety of nutrients I am feeding the plants should have sorted out the leave spots and yellowing, but it hasn't. The leaves that are affected were and are at the bottom and top of the plants. They are so short there isn't much difference between the two though, heh heh I would love to know the most likely culprit(s). I'm thinking maybe the safest move would be to water without feed next time (though Biobizz seem to recommend a constant dose of nutrients) dropping the pH to 6.2 or so and turn the light down maybe to 65%? Other Thoughts I've had Could it be a nutrient lockout somehow? Or should I just be boosting the nitrogen nutes, despite the burn I am seeing? In which case, should I try taking the feeding pH down to more like 6.2 in case there is a lockout occurring despite only being a touch high at pH6.8 ? Do I need to boost the cal-mag levels to the full dose recommended by the manufacturer? I felt I was only likely to be a little under, but I suppose it probably couldn't hurt to turn up the dose to full - even if there's already a fair baseline of calcium and magnesium in the water? Is it light burn, if so, why at the bottom of the plant as well? I'm going to get some shorter, wider pots for next go to shave a few inches off the starting height and allow them a touch more headroom. I wanted to try smart pots this time though and couldn't get them in a shallow and wide format. I'm not sure how much I could dim the SF1000 and still give the buds enough light. I mean it feels like I could drop it further, though there isn't uncomfortable feeling heat at bud level. Though the light is a lot closer than it would be in a typical grow-tent with plenty of headroom, it is serving a smaller area and is running at about 70% power. There is a breeze across the top of the plants, but with my hand under the LED for 60 seconds, it doesn't feel particularly warm or even hot. I'm left wondering If I drop the light much more, will it still provide enough light to flower well, if I haven't already completely scuppered my chances? Should I cut nutrient levels back down? I have included some photos of the grow, below. Ending with tonight's affected leaves. Any advice at all would be gratefully received. I have read up a bit, but I don't think reading gives you as clear idea as experience. In this case, I am working with so many compromises and unknowns that I don't honestly know which symptom is strongest and needing tackling most. I know a micro-grow will often have issues simply because of the downsizing, but I am definitely going wrong, I suspect in 2 or 3 places. So any advice will be gratefully received. Outdoor in soil was quite a bit less problematic. ------------------ This First Image is from a couple of weeks ago, before the problem advanced. This is from the last couple of days. Many fan leaves have fallen off and the other leaves are going yellow and burnt in the centre or at tips. Thanks in advance for any help you can offer folks! [Thanks too, to the admins for letting me in!] Midge.

WELCOME! Id love to say "I'm back" with another micro grow but i have had to make a new account due to stupidly using my old user name on lots of other sites. Not gonna lie, it sucks a bit as i was a active user of the forum about 6 years ago and ran a few grow diaries then but ended up not finishing the threads. Now i come back to do another and realised a new account must be made, which means i lost my subscriber status oh well, start new! So here is what will turn into my diary for my current grow, its been 6 years since my last attempt, and again i'm just fed up of spending a fortune on what i know i can grow at home! Enough chit chat, lets get into it! For this grow i will be using a 92l storage tub, lined with diamond mylar (not very neatly if i do say so myself ), a LED light unit i purchased from a guy online who makes them (holy shit is it bright), inlet fan, exhaust fan pulling through a home made carbon filter box, 6" pots and i will be growing the sweet seed mohan ram using a good amount of low stress training to keep the plants low and bushy! This worked wonders before when growing in PC cases so i'm hoping it will contain them nicely in this box, as the light is a lot more powerful than last time and the pots are bigger so i'm sure they are going to fill the space right up!! I have grown the mohan ram before and its a great plant for small spaces due to the way it stays nice and bushy! i decided i would start the diary today and i have just about finished building the box and the seeds are almost ready for the soil! So first, the box itself! Its a very simple bodge job set up i have pieced together from random cheap bargains online, but considering my last grows were inside PC cases im gonna have way more space to work with! Its not pretty, used lots of hot glue, double sided tape for the mylar application and my trusty knife to cut rough holes for the fans to pull through. Being someone who doesn't do a great deal of building stuff though, i'm pretty happy with how it came out! The 2 fans are just 140mm PC fans, wired onto a 12v 1a power adaptor, took me an hour or so to work it all out last night but its all working now! (The fans wires were marked very weirdly so trial and error took a while to get them paired up right!). The light is a LED unit that the seller says produces 12k lumens of full spectrum light and uses a metal fin design to dissipate the heat. Each LED has 8 reflectors around it too so the light coming off of this bad boy makes the 80w CFL i was using in the PC cases look like a low battery keyring torch. Here is a couple images of the box from the outside! Now that the box is ready, the light is mounted to the top of it i decided to bang 3 seeds into some water! They all cracked nicely over night and then this morning have been put on some wet paper folded over to help them show a good root, then ill be putting them into the soil later tonight or tomorrow morning! Exciting times! I could bang them right in the soil now as they shown a nice start just in the water, but i think ill let them go another 12 hours in the tissue just so i have a good established tail before planting! The idea is going to 18/6 for the whole grow as they are autoflowering. Medium is biobizz all mix, nice and simple, i went with the plant magic last time so i thought id switch it up and try the bizz this time, and i also grabbed their try pack of the 3 organic feeds, veg bloom and topmax! I'm aiming for an OZ per plant dried if i can, then if the smaller 3rd makes much thats just a bonus! as working it out, 2 OZ would last me nicely until i could have another couple of plants ready for the chop on round 2, if this one goes well! The plan was originally just to do 2 plants as space is tight in the box, but i popped 3 seeds in to make sure atleast 2 would germinate, but all 3 are doing great so one will be going into a slightly smaller pot and either joining the other 2 in the box if the space doesn't get to tight, if down the line i start to get short of space then it may well have to be a conservatory girl if it stays nice and small. Not really a lot to add at this point, but hopefully in the next 7 days we'll have some pictures of some girls poking out of the soil and getting started good and proper!

So, I hope this thread will gather up the valuable knowledge and experience of the many envirolite users, past and present, in UK420... Please do not use this as a place to explain how much better other lighting systems are - there are loads of threads explaining that, I would like this to become a comprehensive go to thread for anyone, for whatever reason, who wants to or has to use envirolites. Some of the information is already available in other posts - I've been reading s LOT!!! But its usually between the lines as part of a grow diary etc, so the hope here is that some clear information can be grouped together in one place. I admit, its a bit selfish as I'm a newb to growing and want to find out what I can about the various types of envirolites on the market and the pros and cons of setting them up in various positions... So, to start things off, I have a bunch of questions. Is it better to get 1 X 250 dual spectrum envirolite or 1 X 6400 k and 1 X 2700? Basically, is it better to use a dual spectrum or to mix bulbs? Has anybody got any experience using the 340 watt models - are they significantly better than 250 watt in terms of yield, or does heat become an issue etc. Reflectors: some envirolites are sold with reflectors - when is it best to use a reflector and when is it better to hang the envirolite vertically? That's it for now! Hope to see what experienced users have to share!!! Thanks!

hey all hope your having a good day, I'm new to indoor growing and am about to start my first indoor micro grow in a water butt that measures .5m x.9m. I'm on a very tight budget and managed to stumble open a couple of 125w cfls for only £10 on ebay. They are classed as 'photography lights' and are only 5500k instead of 6400k/6500k so are not true daylight. Does anyone know if these are suitable for growing? or has any experience growing with 5500k lights? thanks , budie

Hey all, I have a small grow box, round 60cm X 65cm X 35cm. I'm coming the the end of my second grow using a 138w galaxyhydro ufo. The light is great but with the space i've got it doesn't offer enough coverage for two plants. I've been looking at alternatives and come across multiple 300w grow lights on amazon for £80/90. Would one of these be overkill for such a small space, produce too much heat or burn the plants in any way as they will be very close to the canopy? cheers, budie

Hey all hope its going well, Having ditched my previous idea of growing in a water butt due to having nowhere to put it I was thinking about growing under my bedroom sink. It is a relatively small space at W: .45m x H; .65m x L: 1.15m not to mention its got a sink in it but perhaps with some lst I could make it work. Does anyone any experience growing in very small spaces and could point me in the right direction? Or let me know if it just a complete waste of time? Thanks, budie

I am new to LED for growing. However I have read a lot of interesting stuff on it. I'm just wondering how much heat they produce. My idea would be to use it in a small closed cabin without airextraction. This would make it possible to use a CO2 controlled environment. No airextraction would mean heat buildup. But I wonder if this would be a problem with LEDS. Anybody want to share his experiences on this matter? Thanks in advance

Hi Guys, I just wanted to show you a micro box with full temperature control i built for a friend of mine. You can set night and day temperatures. It has a heater matt in the bottom, a carbon filter and has been through a full grow already and it worked great! The carbon filter works perfectly. I’ve fitted a rather big LED light for the size of the box. There are some pictures below of the build along with a circuit diagram for the electronics if anyone wants to build one. Not got any pictures yet of it in use from him yet but i’ll get them up asap. Circuit Diagram: Pictures: