As summer fades and your zinnia plants start to wind down, there’s a simple way to save money for next year’s garden: collecting their seeds! Zinnias are easy-to-grow flowers that produce tons of seeds you can store and replant, cutting down on the cost of buying new seed packets or seedlings every season. Here’s how to do it: Wait until the zinnia blooms fade and the petals dry out, turning brown and crisp on the plant. Snip off the spent flower heads and let them dry completely in a paper bag