Tried dr earth dry ferts awhile back with great results and now my super sour runts run is sad. 50/50 happy frog/cult nation coco. Media is about 6.3 ph. Last fed 2 days ago at 60 veg/40 bloom. Watering at 6.4-6.5. Feeding every 21 days at 2 tbsp/gal of soil. Currently in week 5 of flower. Went 70/30 bloom/veg in week 1. The yellowing would suggest maybe I reduced veg food too soon? Gave her some raw N yesterday. Also, some purpling accompanying the yellow. I recall I miscalculated and underfed something awhile back but not sure which plants. Any thoughts on cause and or remedy? Thanks.
Organic grow issues
- Thread starter Fishmon
- Start date
Wastei
Well-Known Member
The high cation exchange rate of coir makes Organics really hard to do properly and optimally. It's better to use peat or other media for the intended purpose IMO. Coir needs to be replenished with minerals with every feeding to keep pH and EC in check.
The nutrients are not being released fast enough with organics and what's being released is being used up as a buffer (Coir hold on to Calcium and Magnesium) while leaving other minerals for uptake. This create a very unpredictable nutrient and mineral profile.
Straight coco coir is a hydro medium and should be treated as such being fed with a mineral based plant food in readily available form. There's a lot of bad instructions and growers on YouTube mixing organics and coir with sub par results. The most common clown is probably "Mr. Canuck" that brought us a lot of sad plants and lost souls following his bad practices.
The nutrients are not being released fast enough with organics and what's being released is being used up as a buffer (Coir hold on to Calcium and Magnesium) while leaving other minerals for uptake. This create a very unpredictable nutrient and mineral profile.
Straight coco coir is a hydro medium and should be treated as such being fed with a mineral based plant food in readily available form. There's a lot of bad instructions and growers on YouTube mixing organics and coir with sub par results. The most common clown is probably "Mr. Canuck" that brought us a lot of sad plants and lost souls following his bad practices.
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So no expert here, but Coir requires a low PH (5.6 -5.8 ) when using, even if mixed with HF, you will need to bring the PH down to say 6.0 to 6.2. As far as the yellowing goes, seems to be only bottom fans, is the new growth showing any signs? If not could be some natural fade down low.