Spend some time with the Arboretum's teen volunteers as they tell you about their upcoming Citizen Science Projects and how you can become a citizen scientist at the CHA. April 9: Project BudBurst; May 14: Mother's Day Wildflower Walk; June 18: Fathers in the Forest- Annual Father's Day Hikes. Hikes depart at 11 am, 1 pm, and 3 pm.