Quote Originally Posted by rhizome
Have the leaf veins remained green? If so, I'd be looking at Fe (iron) def. If not, I'd be looking at Zn (zinc) toxicity.

Either way, this is going to be a pH issue.

What ya gotta do-

Go out and buy a pH test kit- range of 5.0-8.0 or thereabouts. A fishtank kit doesn't have a wide enough range for our purposes.
Pick up a little DISTILLED water- must be without dissolved minerals for our purposes.

Take a soil sample FROM THE ROOT ZONE- not just from the top of the pot. pH in soil can vary a LOT according to depth.

Put your sample in some distilled water- shake it about, mix it up really well. Let settle.

Now do a pH test on the water that you've exposed to your sample, according to packet directions. You'll get an accurate reading.

Test kit should run about $7US- good for a hundred tests. Distilled water will run about $3US/gallon.

Remember to treat this as labwork- rinse w/ distilled between tests, keep stuff clean- cap the test vial, don't just put your finger over it.

Hope this helps.

im going to get a good quality ph metre.
ok.....so once I do it what do I do?? if its over or under? or do we cross that bridge when we get to it?
timbuck3 Reviewed by timbuck3 on . New Shoots/leaves lime green/ PLS HELP! I cant post pics JUST YET, however will do my best to let you know the score. Northern Lights bought from Sensi Seed bank....Feminised. 250HPS.....small cupboard. very good ventilation and nice mini fan. Only one plant. Rating: 5