How do Tulips know when it's Spring?

It’s spring in the northern hemisphere and the landscape is filled with flowers, but plants don’t own calendars, so how do they know when to bloom? And furthermore, how did us humans know how the plants know when? (this is getting a bit meta)

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Learn More:
Structural Features Determining Flower-Promoting Activity of Arabidopsis FLOWERING LOCUS T (2014) WW Ho Ho and D Weigel, Plant Cell, http://www.plantcell.org/content/26/2/552
Florigen Coming of Age after 70 Years (2006) J Zeevaart, Plant Cell, http://www.plantcell.org/content/18/8/1783
Tulipa gesneriana and Lilium longiflorum PEBP Genes and Their Putative Roles in Flowering Time Control (2017) H Leeggangers et. al., Plant and Cell Physiology https://academic.oup.com/pcp/article/59/1/90/4568574 [my wife's paper]
FT Protein Acts as a Long-Range Signal in Arabidopsis (2007) K Jaeger and P Wigge, Current Biology, https://www.cell.com/action/showPdf?pii=S0960-9822%2807%2901388-7
Florigen: The Hidden Hormone (2016) V Hanlon, The Science Creative Quarterly, https://www.scq.ubc.ca/florigen-the-hidden-hormone/
How do Plants Know When to Flower? Wonderopolis, https://www.wonderopolis.org/wonder/how-do-plants-know-when-to-flower
Florigen, Wikipedia https://en.wikipedia.org/wiki/Florigen

Видео How do Tulips know when it's Spring? канала Soliloquy