Re: Flowering time : latitudinal relationships?

> * The term "co-incide" or maybe "coin-cide"(I think that is the spelling) 
> was coined was coined 20 years ago or so by an entomologist who was looking 
> at ways of predicating pest insect emergence.  He noted that regardless of 
> location, when forsythia bloomed, a certain aphid for example was within 
> days or emergence.  This way spraying could be managed rather than 
> blanketing everything all the time, you could target spray.

Exactly!  Another example is pine sawfly, which should be sprayed for as 
soon as Spiraea x vanhouttei starts blooming.

> It is safe to say that when a particular cultivar or species is say in full 
> bloom in Chicago, that point in time for that specific location, 
> corresponds to the same point of time where ever that plant is in bloom in 
> that region.

So is it then possible to build a relationship based on key indicator 
plants?  That's what I was hoping...

If I took a list of 50 common species and compared their blooming times
in major cities throughout the US, could that value be extrapolated 
against other plants blooming at similar times?

The plants would have to be in "average" conditions -- something planted
in a protected courtyard near a steam vent would probably bloom sooner
than its less fortunate counterparts.

Hmmm...  :) 

Chris

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