I bought 6
Phals at Lowe's this summer in various states of dehydration and neglect. I repotted all of them immediately, cutting off all dead/dying roots, trimmed sunburnt leaves, and removed spent spikes.
They spent the rest of the summer outside in the heat and humidity, under a tree, with a good watering 2-3 times a week.
By October, when they were brought in for the winter, temps at night were in the 40's. A couple were already showing signs of spikes. Now, in December, 5 out of the 6 have spikes. Some have just spiked within the past couple of weeks.
You may see something yet. Winter hasn't even started, technically
Fingers crossed for you.