Once again I see a PH problem. These are classic signs of high PH most likely coming from the tap water. I'm sorry to sound like a one-hit wonder here and preaching the same line over and over but like I said earlier, most problems involving our plants stems from bad PH. Second cause for most problems is too much loving and third being natural (insects, disease, etc). All of which are controlable but only after a proper diagnoses first.

I'm growing White Russian right now too and know they're a hardy plant and should recover quickly once you find the source which I would bet on it being fixed once you either filter your tap water or use bottled water. A quick, easy and cheap test kit can be bought at any nursery and you'll be able to know for sure exactly what the prob is.
madeline Reviewed by madeline on . Nutrient def????? Hi everyone. Me need help. I've been growing for a few months now, so far so good, until now! I'm growing white Russian, its been in veg for 4 weeks now and has developed a rusty colour on the leaves in between the veins. This starts as milky white spots that develop into rusty spots that then spread across the leaf. This is only happening in the middle to older aged leaves. Plenty of new growth coming through quite happily. I have included pictures for diagnosis. I'm growing in rock wool slab Rating: 5