hello, not sure about plant swaps....but have you heard of the Garden Mama? FM 97.3 here in the capitol city, mornings from 9-10....she sometimes has info on that and much more.
Just got this email this morning.
APRIL SHOWERS BRING MAY FLOWERS AND THE ANNUAL 'HANNAH SCHMIDTÂ MEMORIAL PLANT SWAP
SATURDAY, MAY 20,2006 9:30 A. M.
Rain or Shine
147 CHURCH ROAD
Bring a plant and a friend