60% of my phals this year are now giving me double spikes, but last year the ones that spiked only gave me one. I think that the older and more mature phals tend to send up double or more spikes, and I think too that genetics plays a role in that as well. Many of my phals are also sending up branching double spikes, whereas last year only half a dozen did that. So from my limited experience, the culture they are growing in, genetics and age are all a factor. I also understand that orchids found in grocery stores and big box stores have been grown under conditions most likely different from the cultural conditions of a house.
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