Soil & Seeds: March 19 1-2 pm Celebrate spring by getting dirty in the soil, discovering worms as they wake, and planting seeds to nurture at home with soil, sunlight, water, patience and love. Ages 3-5 Parents stay with their child. $5.00 per child per lesson Please register at least one week prior to the program. For more information or to register contact the Tree House at 215-685-9285 or WEC@phila.gov. Wissahickon Environmental Center- Tree House is located at 300 W. Northwestern Avenue, Philadelphia, PA 19118. The driveway to the Tree House is at the corner of Forbidden Drive and Northwestern Avenue.