The Dormancy Clock
Where the year stands
Shortening days are half the signal that sends temperate plants into dormancy. Here is where the year stands at latitude 34.2°.
Temperature is the other half of the signal, and there is no forecast for this location. Check your own night temperatures before acting.
Days cross 12 hours in 60 days — September 28.
Day length is one of two signals. Temperature is the other, and sources disagree about which dominates — Barry Rice writes that the relationship is not completely understood. Use this as a seasonal orientation, then check your night temperatures before acting.
Dormancy sets in when short days coincide with night temperatures of roughly 40–60°F. A flytrap resumes making traps above 55°F, so a warm garage in January breaks dormancy early and exhausts the plant.
Where this is measured
No location set, so this is a default. Add a postcode on your profile and the clock becomes yours.