For gardeners and other plant-lovers, here's a sampling of regional events:
5K Run for Clean Air Cash prizes, contests, food. Martin Luther King Dr.; 5krunforcleanair.org. 4/21. 9 am-12 pm.
Bird Walks Sat. Call 215-345-7860 for more information. Peace Valley Nature Center, 170 Chapman Rd., Doylestown. Donation suggested: $2. 4/21.
Birding With Ruth Bird walk led by experienced area birdwatcher Ruth Pfeffer. Norristown Farm Park, 2500 Upper Farm Rd., Norristown; 610-270-0215. www.birdingwithruth.com. 4/26.