First grow- Yellow older leaves / rust spots

bobcharlieeeee said:

The yellowing is getting higher up the plants tbh, they look worse now!

Iv given some epsom salt now in the hopes it helps, Cal/mag iv been told should be 3:1, mine is 100/1

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Hard water can be a source of problems as minerals from the water build up in the pots. The pH ends up too high then all sorts of problems crop up that are hard to do anything about other than flush well to remove all the excess salts and make the last water to go thru a good feed at about 1/2 strength max.

I avoid all that by using RO or distilled water. When my plants have problems it's because of my screw-ups dammit and not the bloody water.

If nothing else you might want to make it 2ml/L each next feeding and get a bit more N in there. Some plants just start fading old leaves earlier than other too.

bobcharlieeeee said:

I think i underfilled the pots with soil, the all mix sank alot more on the first watering than i expected. Next grow i will be filling the pots with more soil, The plant middle right, was started in a small pot and transplanted, it has more soil in the pot and that the most healthy plant overall, i think the more soil has helped with the watering issue on that one plant.

I have reduce the amount of water i give and increased the duration between watering's, i actually think one day i left it slightly too long between watering's,

I have been giving 3ml bloom and 1ml grow per litre as i was convinced it was a Phosphorus / Potassium issue. and was given that advise on another forum, However leaves still continue to yellow so iv probably made it worse! Although might be too early to tell.

Iv since watered a couple of plants with plain water and 0.4g epsom salt per litre in the last hope it will help.

Cal/mag iv been told should be 3:1, mine is 100/1 !, iv also been recommended hard water nutrients


cant wait for this grow to finish now so i can start again!

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I feel whatever deficiencies or toxicity are showing in the leaves is caused by not having a prolific enough roots system your pots are so clean with barely a root tip showing where there should be 100s of them, if you get that part right it will be a good grow, Ive never grown indoors in soil so I don't really know of the issues that come with that, I like to be able to adjust things with moisture etc quickly and nonsoil hydro allows that, its all about establishing that bottom end.

I hear you with cant wait to start the next one, yours ain't too bad Ive had way worse and it's psychological torture every day seeing them finishing out, you just want to burn the lot down and start again lol.

One of the areas that's flipping Cannabis yields on its head that you can research and adopt into your growing is Crop Steering, which at its core manipulates irrigation volume and frequency, the timing of drybacks, and controlling EC levels, its all actually easy to do in small grows without all the sensors they use you just need to measure total water holding capacity over time and measure runoff to arrive at the right feeding schedule for your media, they are pushing 3-4 EC values with no ill effects which is massively high, they are starting to hit 4lb a light which is insane so it works, Ive just started 2 wk old cuttings in airpots and applying Crop Steering techniques and they are powering on 2EC nutrient and 8 150ml shots per day, its about keeping the moisture level in the root zone constant at the required percentage throughout its day with enough runoff in the last feed to keep the EC in check, Ive been growing for a long time and this crop steering has got me very excited to what it can do.