It is better to transplant stock on a dull, moist day, rather than on a bright, sunny day, because the planter needs to give less attention to the drying out and consequent injury to fibrous root growth. The most ideal weather for moving plants is a day when a cloudy condition exists and when there is ample moisture in the air. Avoid bright, sunny, dry days on which to do transplanting, unless plenty of water is used, or the plants are thoroughly dormant. Dry winds are equally as injurious as hot sun. The general rule is that no plant should be transplanted except with extreme care, and only when it is entirely dormant. Plants are generally considered dormant when the flow of sap has ceased in the top, at which time the season's growth is completed, and when the wood has had an ample opportunity to ripen and harden. Deciduous plants are dormant when the leaves have fallen or turned brown. Transplanting before the wood is thoroughly ripened is one of the sources of winter-killing. It will be noted under group No. 40-A and 40-B (on Page 289) that there are certain types of stock which should be transplanted in the spring and others which should be transplanted in the fall to secure the best results. The explanation is contained in Chapter XL (Plants Difficult To Transplant And Those Adapted For Transplanting At Specific Seasons Of The Year). Evergreens require different rules for time of moving and must therefore be considered separately (See Page 48). It is practicable to transplant small trees, many evergreens and many shrubs, together with perennials, before they have finished their growing season or after growth in the spring has well begun; but this should rarely if ever be attempted with large trees. In such out-of-season handling of the stock extreme caution should be used to prevent drying out, and the plant should be moved, if possible, with the earth balled about the roots.