The children of Year 4 think it is a yellow poppy
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Poppies like disturbed ground, so wherever you have been gardening there's a chance some will sprout.
It isn't so much that poppies like disturbed ground as the fact that corn poppy (papaver rhoeas) seeds remain viable in the ground for decades. Even soil that has been unturned for many years will often have viable seeds that come to the surface and germinate when it is turned.
This is why the red annual poppy is the symbol of remembrance - on the WW1 battlefields, once the fighting had stopped, the only seeds left that were viable, at a depth where they could germinate, were poppies, so the deserted battlefields were ablaze with poppies. The fact that they were blood-red just added to their significance and suitability as a symbol.
Lat/Lng: 52.0, 0.2
OS grid ref: TL5746