Re: in which month fertile horsetails are found?

Let's observe it next year for the Field Horsetail. Won't be too difficult to organize, even we could do the same in Europe. 

Wim


ralpharcher wrote:

Wim
I went back and looked at the data for the fern emergence study reported in HFF Bulletins several years ago. It studied the dates that ferns of various species emerged in different parts of the USA. The dates for the first fiddlehead to emerge from plants from 24 different fern species was April 14 to May 17 for a garden in Madison, WI ( latitude: 43 degrees North ). Emergence from plants of 22 of the same fern species in a garden at New Gloucester, Maine ( latitude: 44 degrees North ) was April 15 to May 22. No studies of the Field Horsetails or when fertile fern fronds started to emerge were made. I donbt know if four or five weeks later for fertile fronds to appear is reasonable, but it will be interesting to look next year. 
Hope this sheds some light on your question.

Ralph in Louisville, KY
----- Original Message ----- From: "bkhamilton" <bkhamilton@earthlink.net> 
To: <ferns@hort.net>
Sent: Sunday, July 06, 2008 5:27 PM
Subject: Re: [ferns] in which month fertile horsetails are found?



Seems a little  late to me, but here in NW Indiana, we had a very mild,
slow spring, and maybe there too? Are you having a good time in Canada?
Seeing lots of ferns?

Betty in South Bend IN

-----Original Message-----

From: Wim de Winter <Wim.deWinter@wur.nl>
Sent: Jul 6, 2008 4:17 PM
To: ferns@hort.net
Subject: [ferns] in which month fertile horsetails are found?

I was surprised to find coning Field Horsetails (E. arvense) as late as
June 22nd in the very South of Canada (latitude: 45 degrees North),
being used to seeing them the first week of April (last of March,
nowadays). Is this the normal time in the US/Canadian border region?

Wim de Winter

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