Being able to effectively communicate, being an active listener,  maybe even being able to learn something from another point of view is really necessary to plant seeds for Christ. Something I am learning and trying to put in to practice! Reading the book Tactics by Gregory Koukl has been an invaluable resource in helping us learn to speak in a way that can plant seeds. He gave us some Biblical insight into being a constant gardener.  This book is an easy and quick read but really holds so much wisdom.