The later flowering ones like penstemons might not like an early dose of it, but the rest should love it. When the primulas get large you should split them up and replant them, preferably with a little shade. The aquilegias will self sow, so there's some free plants. The cyclamen will probably disappear completely for the summer, but try and remember where they are. I take it that by bleeding heart you mean Dicentra spectabilis? Dicentra is a good family to investigate, lots of species that do well in shade and semi shade and have valuable spring flowers. The fritillaries again would be helpful with a specific, the larger species along with the agapanthus enjoy a bit of being root bound or competition from other plants. The phlox are a late summer flowerer and are prone to mildew, but good garden maintenance and air circulation helps enormously. Heuchera will self sow when happy, a vast family due to recent plant breeding, I saw a vast display at a nursery near Newark that was incredibly colourful, though I was only tempted by Geranium phaeum varieties as I was collecting them with a view to breeding new ones before I came to live in Spain.