How Do Flowers Know When to Bloom?

Flowers tend not to own calendars, so how do they know when to bloom? Hosted by: Hank Green ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters—we couldn't make SciShow without them! Shout out to Kevin, Bealer, Mark Terrio-Cameron, KatieMarie Magnone, Patrick Merrithew, Charles Southerland, Fatima Iqbal, Sultan Alkhulaifi, Tim Curwick, Scott Satovsky Jr, Philippe von Bergen, Bella Nash, Bryce Daifuku, Chris Peters, Patrick D. Ashmore, Piya Shedden, Charles George ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: http://www.livescience.com/32529-how-do-flowers-know-when-to-bloom.html http://www.washington.edu/news/2012/05/25/its-in-the-genes-research-pinpoints-how-plants-know-when-to-flower/ https://www.mpg.de/7530520/flowering-time-arabidopsis https://www.nsf.gov/pubs/2002/bio0202/model.htm https://www.britannica.com/science/meristem http://www.livescience.com/377-mystery-solved-plants-flower.html http://science.sciencemag.org/content/309/5741/1694.full