CHICAGO — WGN’s “Plant Daddy” Tim Joyce is back to share some weekend gardening tips, including how to harvest tomato seeds, how hibiscus flowers get their colors and more. Got any questions for Tim?

Hibiscus are ideal plants to add to your garden. Their vibrant, colorful blossoms add excitement and curb appeal while also attracting hummingbirds, butterflies, bees, and other helpful pollinators.

Just because you've plucked all your garden's fruits and veggies and watered your flowers for the last time doesn't mean your gardening job is over. It's time to start harvesting seeds. While it's ...