soil temperature variation with depth in a bulb garden

Peter Taggart
Fri, 22 Nov 2013 11:13:32 PST
apologies in that I missread this book this morning.
The correct information is:
dormancy in 'dutch ' Iris is initiated by temperatures greater than 17 C.
Optimum temperatures for initiating flowering shoots are 8 to10 C for 6 - 9
weeks, depending on the variety
Page 84, Ornamental Geophytes

Peter (UK)

On Fri, Nov 22, 2013 at 4:21 PM, M. Gastil-Buhl <>wrote:

> Peter has been doing my homework for me, reading that thick textbook.
> He writes:
> "Temperatures less than 17 C apparently act as chilling for certain
> 'dutch' Iris for example."

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