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I am sorry, Jean-Michel, but you need to be more precise.
You posted a photo with "Jean-Michel GAREL : France : Brannay : 89150 : 24/03/2020". I have no idea if Brannay is Yvonne or Finistere or whatever.
Yes, bergenstammi is active on 28th of april no problem, but 24th of march is much earlier than 28 th of April.

To avoid these types of confusions, please always specify locality and date at the beginning of every post , thanks

Theo