A Zone 7a planting calendar for the DC/Maryland region is in development. In the meantime, the University of Maryland Extension Home & Garden Information Center publishes the canonical regional growing guides — university-research-backed, calibrated to Maryland and the broader Mid-Atlantic, and updated regularly.
UMD Extension is to Maryland what UC Master Gardener is to California — the trusted local authority for home gardeners.
Visit UMD Extension HGIC →