The superbloom about six hours north of San Francisco began in early May. NPS photos / O. Seweryn Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. Death Valley National Park’s ephemeral spring superblooms get most of the attention, but another national park in California has its own impressive floral show this year. Redwood National Park in northern California is awash in a purple riverbank lupine ( Lupinus rivularis ) superbloom . It was first spotted earlier in May and is expected to last through the end of the month.  The park six hours north of San Francisco is home to over 30 species of plants, including to the state’s famous redwood trees —the tallest trees in the world. The landscape features open prairies, oak woodlands, wild rivers, and untamed coastline.  Purple riverbank lupines help attract important pollinators. Image: NPS photos / O. Seweryn.…