Quote:
Originally Posted by RosieC
I've heard the same about certain types of fruit due to a chemical they give off.
I also had one which blasted this year just as another Phal was dropping it's spent flowers due to age. I wondered if some chemical released in to the air by the one with the spent flowers caused the others to blast as well, but I've no idea if that is possible or not.
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I think you guessed right. Fading blooms (and ripe fruits) produce ethylene (which causes fruit ripening and flower senescence) and when another plant detects ethylene, it triggers an upregulation of ethlyene in that plant that can also lead to fading blooms. But I think that they would have to be really close together and the other phal near the end of it's blooming too.
I had a bad experience with bananas. I was cooking and needed space, so moved the fruit bowl to the table (where the blooming orchids stay) and forgot about it. 3 days later the phal who's spike was hanging over the bowl was dropping blooms... I also discovered that burning inscent next to blooming orchids is not a good idea either. Got more blasting.
Aside from that, I have a phal that tends to blast a few buds for no reason at all, every single blooming. There might be something genetic making it extremely sensitive to minute changes in the environment.