Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Temperature responses (days/°C) for 66 phenophases recorded at the Poznań Botanical Garden in the period 1977-2007 plotted against the mean date (day of the year) of the phenophase. A dotted reference line has been added; phases below the line getting earlier with warmer temperatures, above the line later
