Need Opinion on whether to repot Oncidium Twinkle

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Originally Posted by jkofferdahl

I'd strongly urge you against ever using hydrogen peroxide on orchids. It is very caustic to them, can eat the velamin right off of roots and cause damage to green tissue. You couldn't do much worse pouring drain cleaner (or hydrochloric acid if you prefer) on your orchids.

Seal cuts with a dab of cinnamon powder.

I do use cinnamon powder too. And hydrogen peroxide was extremely diluted. Probably about 80-90 percent water. But if it is that bad I will stop using it.

Is it still caustic at the stated dilution? I have used even less before. It's the regular 3 percent but super diluted. I usually only use it when there's a major problem. Such as a bunch of mushy pseudobulbs or lots of fungus on roots. Flower spikes and regular wear and tear are sealed with cinnamon. I rinse with water after using hydrogen peroxide, not the cinnamon.

Also wondering why it is caustic (not doubting it, as this is the case for people), when it breaks down into water upon contact with light? Is it just the reaction that makes it so?