This post is mostly a reminder to myself to repeat (and improve on) the experience next year. Read on if you are interested in flowers though.
Some while back, when the spring was only just starting, I noticed that some of the companies that advertize for guided tours were offering "Ruta de Tajinaste azul" (Route of Blue *Something*, where "something" was a word I'd never seen before.)
A little while later, I went for a walk around Teror and noticed some tall blue flowers on the slopes - not many, and a little bit too far off the path to go and investigate. I got interested and then connected those two things together - people going to look at something blue, and these tall blue flowers, very visible amongst the vegetation that tends to yellow.