Mark your calendars for Saturday, July 9, because the Urban Garden Center is once again holding educational workshops for the public, this time on orchids and composting. Can’t wait? Guests are welcome to arrive early for a guided tour of the Honolulu Rose Society gardens beginning at 9 am, visit the Master Gardeners’ “Got a Plant Question?” booth, and check out the interesting “Coconut Rhinoceros Beetle” display.