Re: leaf burn causes?
I am probably not the best person to answer your inquiry. But seeing no responses as yet, maybe my words will induce the more knowledgeable members to chime in.
I stopped my Spathes from experiencing leaf tip burn by taking the advice of the late Steve Lucas who indicated to me that he grew his in an almost swamp-like aquatic planting, with the roots continuously wet (that is, soaking in a puddle of standing water). Once I tried his technique all my new leaves stopped having tip burn and they continue to be fully green to this day (five years now). My water is pretty good, being relatively low in conductivity and moderately alkaline pH (in accord with desired municipal practice). I do not fuss with mixtures with DI water or trying to modify the pH.
One factor you might consider would be the relative humidity of the surrounding air. Assuming that wet feet would not be desired for many species, having a low relative humidity might put stress on leaf tips on those varieties with more normal water likes. This might also account for your seeming success at work with problems at home. Just a suggestion.
I also grow Anubias, but mainly in a submerged state. I never have any sign of abnormal necrosis with these. When I have grown them with leaves emergent I have also never had and tip burn or abnormal necrosis. This one is a mystery to me. I also would not exclude the possibility of disease.
Other factors that might be in play are those involved with horticulture taken as a whole: light level, air movement, temperature, environmental variables such as day-night fluctuations. My advice would be to take notes on anything you might think about and compare the environment where you are successful to where you are not.
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