Hi CL, as I thought these are not white poppies. The photo is taken with annual pots in the immediate foreground. The white flowers are geranium.
In the background, the 3 high flower heads to the right of the pergola are the climbing roses, it's the lighting which makes them look white. In the near left segment you can see white Echinacea. Just behind them in the back left segment there is a clump of white heads which is Leucanthemum / snapshot daisy, put in to replace a miniature rhododendron which fell ill....(nursed to recovery in a pot).
Cowen Garden Design