phe·nol·o·gy
Pronunciation:  \fi-ˈnä-lə-jē\
Function:   noun 
Etymology: phenomena + -logy
Date:  circa 1884
1 : a branch of science dealing with the relations between climate and periodic biological phenomena (as bird migration or plant flowering)
2 : periodic biological phenomena that are correlated with climatic conditions

So it's all the "common sense" things our grandparents knew. They were a little more aware of how nature worked and would use signals from the garden to tell them when/what to plant and what pests would be appearing too. Here's a link to a great article, from Horticulture magazine on the subject. Here are a few out of their list...
1 : a branch of science dealing with the relations between climate and periodic biological phenomena (as bird migration or plant flowering)
2 : periodic biological phenomena that are correlated with climatic conditions
So it's all the "common sense" things our grandparents knew. They were a little more aware of how nature worked and would use signals from the garden to tell them when/what to plant and what pests would be appearing too. Here's a link to a great article, from Horticulture magazine on the subject. Here are a few out of their list...
- When daffodils begin to bloom, sow peas.
 - When oak leaves are the size of a squirrel's ear, sow corn.
 - When maple leaves reach full size, sow morning glories.
 - When apple trees shed their petals, sow corn.
 - When dogwood reaches peak bloom, plant tomatoes and early corn.
 - When crocus bloom, prune roses.
 





















