At times, local organizations such as county Cornell Cooperative Extensions offer workshops on Container Gardening, some of which may be virtual. 

Title: Cornell Cooperative Extension of Westchester County
Author/Source: Cornell Cooperative Extension, Westchester County
Description: Local resource for information on soils, plant selection, plant care, eco-friendly practices, integrated pest management, and more. Offers free or low-cost gardening classes all year long.

For additional resources, please see the following sections of Planting Westchester: