"How Do You Water Your Garden? Irrigation Techniques" takes place at 1 p.m., Friday, March 19, at Oro Valley Public Library (1305 W. Naranja Drive). "Xeriscape Gardening" takes place at 1 p.m., Wednesday, March 24, at the Murphy-Wilmot Branch Library (320 S. Wilmot Road). Free. Call 626-5161 for more information.