midgesmith
Active Member
I wrote a few months ago as both plants - in my very restricted height microgrow (60cm x 40cm x 60cm) under an SF1000 100W 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 Soil, to go with their nutrients and kept the light to 60% brightness max, now 50%, at 24cm. Now I have got both plants to week 7 without much in the way of leaf problems apart from a little brown patch on one or two leaves of ONE of the plants.
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, but I'm likely wrong. 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 each 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 apart from slightly yellow leaf tips - only a few leaves, on one plant are affected currently. This has only occurred from about week 6.
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 the light power down further, if light is the likely culprit though. I felt it looked like a potassium deficiency, hence continuing with the nutrients.
Any clues what the problem might be?
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 Soil, to go with their nutrients and kept the light to 60% brightness max, now 50%, at 24cm. Now I have got both plants to week 7 without much in the way of leaf problems apart from a little brown patch on one or two leaves of ONE of the plants.
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, but I'm likely wrong. 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 each 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 apart from slightly yellow leaf tips - only a few leaves, on one plant are affected currently. This has only occurred from about week 6.
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 the light power down further, if light is the likely culprit though. I felt it looked like a potassium deficiency, hence continuing with the nutrients.
Any clues what the problem might be?
