Name: Cal McGaugh Escondido, California (Zone 10b)
Melaleuca viminalis
After the rain. Bees love it, too.
Most I've seen are crimson, but this one is a nice plum color, growing in a large pot. Its roots have grown through the drainage holes into the soil.
Love the banner, Cal.
Wanting to see more full-sized photos of it, I searched the database for the binomial you supplied and ended up on this page Callistemon viminalis subsp. viminalis
Oddly enough, it has no photos yet, and you seem to be just the man who could supply that deficiency!