Hey, Good to hear about your trip to the Death Valley National Park. According to the official website of Death Valley National Park and many travel forums too, this is the best time to visit as you'll be able to do most of the activities. Lets take up your questions one by one. There are more than 1000 species of plants in the park. You will also see Endemics which are the plants seen only in this park. Flowers are in full bloom throughout the month of April. At this time, you can particularly see flowers at the valley foot and some elevated parts which lie between 2000 to 4000 ft.... read more