Springtime bulb from the Netherlands, whose message is all about the color you choose: purple for royalty or black for power

"I can neither confirm ___ deny"3 "This is on a ___-to-know basis"4 Prefix with "present" or "potent"4 Participates in a race4 Beaver's water-blocking structure3 Meadow flower often used to make flower chains, whose message is all about the color you choose: yellow for joy or blue for loyalty5 Spotify and YouTube, e.g., for two4 X-___ (December celebration, informally)3