Re: in which month fertile horsetails are found?

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• Subject: Re: in which month fertile horsetails are found?
• From: &* S* <t*@westnet.com>
• Date: Mon, 07 Jul 2008 07:46:06 -0500
• Content-description: Mail message body
• In-reply-to: <48712852.2000800@wur.nl>

Here in New York at latitude 41 deg. Equisetum arvense fertile fronds emerge in 
the third week of April and are followed several days later by the first of the 
sterile fronds. The overlap is short with fertile fronds senescing quickly.

I've not noted the last fertile frond emergence date, but by May 1 they seem to 
be on the way out.

> 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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