CINDY WATTER UC Master Gardener of Napa County The sky is blue, the hills are green, and we will certainly have some sunny days ahead. Now is a good time to get your yard prepared for the winter. The recent rains have softened the soil, which will make your garden chores easier. Support local news coverage and the people who report it by subscribing to the Napa Valley Register. Special offer: $5 for your first 5 months! First, take a good look at your plants. Remove plant debris, stalks, dead leaves and anything that looks diseased. It’s a little early to prune your roses, but you should remove any leaves…