The most common cause of blossom drop in my experience is temperature fluctuations. Night temps are important. They need to be 55 - 75 degs F....
Those are very nice-looking hostas. The Gabriella really does have the most interesting of foliage variation. Truls …. That flower is superb....
Lovely poppies, Loggie. Say, what are those colourful beads in that plant pot?