
Originally Posted by
Dorsetman
However, the plant may still have compost around its roots which contains too much stuff - from past fertiliser applications or just from decay of the compost ( yes, even if it is inorganic - even rock wool decomposes ).
Assuming you have a meter - surely you have a meter Maura ? - try this . Take some plain water - distilled, non-ionic or rain- whatever; measure the EC and the pH. Should come out about pH 6.0, EC <75. Pour this into the plant, let most drain out, then catch the last tablespoonful or so. Then take some meter readings of that last drainage. If using bark compost which has started to decompose, you may be shocked at what you get - I have seen pH 4, and EC 1200... That means that the roots are being killed , and the plant will be in less than perfect health. This would certainly explain the die back from leaf-tips.
As to the spots, which are bacterial in origin, they are very difficult to avoid if you have good humidity ; there isa paradox here ; low humidity means no leaf spots , but poor plant health . High humidity means great plants, but high risk of bacterial and fungal infections. The great trrick is finding the right compromise. When you have that figured, let me know would you ?
Will pm you later in reply elsewhere.
Best ,
G.