(BPT) - As soon as the first morning frost appears and the first snowflakes start to pile up, many begin looking forward to spring. Images of green leaves, red and orange blossoms, fresh vegetables and herbs help keep the cold winter days manageable as you wait for the ground to thaw so you can start planting. A good green thumb knows early starts in the garden or yard ensure lush, healthy plants, especially if you're planting trees.