If i dont have any signs of over feeding, flushing is not needed ?So, did the EC get higher and higher in reservoir...even then if plants looks good..no need for bread an water menu..should be able to continue whit the desired EC value for the size of the plant...depending why you flushed,,,if it was just the salt build up prevention..without any signs of over feeding..
I just don't want any salt build up in the futureAre your plants bulimic? Feed,flush,binge, purge
Yes you need to flush with proper amount 2-3 times the pot size and ph water to 5.8,,,the dark leaves and purple stem are caused of salt build ups and so you get nitrogen toxity and magnesium def symptoms...do the flush with lets say if your pot size is 3 gallon then you can use even 9 gallon rinse...after that feed 1-2 days half base nutes but do add some Extra amount of calcium ..that will bring the EC a bit up..don't over do it but its a must (or cal/mag additive) ...after 1-2 days do regular strength feeding but do include the extra calcium or calmag additive...If i dont have any signs of over feeding, flushing is not needed ?
is having dark leaves and purple fan leave stems a sign of over feeding
Every 3 weeks is good to do the flush in coco ,at least in veg to make sure no salt build ups...I am a bit lazy to do them all the time but in veg I do them ,maybe 2 times...other vise if you have a good run off it will help not to get salt build up too easily..I just don't want any salt build up in the future
Lets call it a preventable rinse... no need but depending of symptoms and feeding system if no proper reservoir drip system where you can run with a bit longer feed and run off it is recommended to do rinse every 3 weeks...like I said I prefer not to do too much either but those symptoms he has are a good indicator to do a rinse/flush to make sure no further problems arise..
So option A) Rinse ,=no harm done and prevention of problems.
option B)No Rinse = Salt build ups,dark green leaves Nitrogen toxity, magnesium def =purple stems caused by lack of calcium and
build ups and dis balance of nutrients so NPK ratio is broken.