Yes, you can grow certain cold-hardy palm trees in Maryland. While not native, species like the Needle Palm or Windmill Palm can survive the winters, especially with some protection when young. Maryland's climate allows for these specific varieties to thrive.
Palm trees in Maryland benefit from well-draining soil. They do not like to sit in soggy conditions, especially during winter, as this can lead to root rot. Amending heavy clay soils with organic matter like compost or sand can improve drainage. A slightly acidic to neutral pH is generally suitable for most cold-hardy palm species grown in the region.